Impatiens

Classic almost care free summer annual. Beautiful full clusters of flowers that butterflies and hummingbirds love.

NEW GUINEA IMPATIENS October 30, 2008

Filed under: Annuals,Flower gardening,Impatiens — patoconnor @ 10:49 pm
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NEW GUINEA IMPATIENS

Scientific Name: Impatiens × hybrida (I. Hawkeri)

Common Name: New Guinea Impatiens

Family: Balsaminaceae

Dr. J. Raymond Kessler, Jr.

Auburn University

Uses

New Guinea Impatiens have only recently become popular bedding plants since their introduction to the U.S. in 1972. Most are grown in hanging baskets or as potted plants for transplanting into the landscape or as container plants for the patio or window boxes. The majority of cultivars are currently propagated vegetatively, although seed-propagated cultivars have recently come to the market (Spectra F1 hybrids).

                       Breeding

The origin of New Guinea Impatiens started with a joint plant collecting expedition by Longwood Gardens and the USDA in 1970. Several plants were brought back form New Guinea and ordinally given separate species names. However, cytogenetic work has shown that they belong to one species (Impatiens hawkeri) but a lot of variation exists within the species. Crosses with additional species form Java and the Celebes islands has lead to the plants in production today.

The first commercial series was called the Circus series, released in 1972. Since that time numerous series comprised of a hundred cultivars have been released. Most cultivars are patented, so do not take cuttings unless your a licensed propagator. Recent breeding have concentrated on shorter plants, shorted production times, heat and water stress tolerance, and variation in flower and foliage size and color.

                  Propagation

Growers may start a New Guinea Impatiens crop in three ways: 1) Order cutting to grow stock plants from which cutting are taken for production, 3) Order unrooted cuttings to root in-house for production, or 3) Order rooted cuttings which are transplanted to the finishing container. It is essential to order the highest quality propagation material that is certified free of disease. New Guinea Impatiens can suffer from tomato spotted wilt virus (TSWV) and impatiens necrotic spot virus (INSV) carried in the tissues.

Everything associated with propagation should be sanitized; sterile medium, clear (new) flats, sterile bench tops, and sterilize anything that comes in contact with the cuttings. Many different kinds of propagation media have been used; peat-lite media, vermiculite, perlite, rockwool, but all must be well-drained and not remain saturated. Propagation medium pH should be 5.5 to 6.5 with a low soluble salts (<0.75 mmhos/cm). Light levels in propagation should be 2000 ft.ca. New Guinea Impatiens cuttings should be ¾- to 1-inch long, with no more than 2 fully expanded leaves and 3-4 immature leaves, with -½” stem base to stick into the propagation medium. Propagation temperature are 70-72F night and 75F days, preferably provided as bottom-heat to warm the propagation medium. Mist intervals range from every 15 min. on sunny days to 2 hours on cloudy days for 5 seconds depending on the environmental conditions. Mist at night is usually not required and may be harmful. Propagation timing:

5 to 7 days Callus forms at base of cutting, high mist, temperature during this period.

10 to 12 days Roots about ¼”, reduce mist to about every ½ hour.

3 to 4 weeks Roots adequately developed for transplanting.

Transplant as soon as the cuttings are well rooted to prevent stretching. Fertilizer or growth retardants are not needed in propagation.

 Growing-On                  

Transplanting: The backbone of New Guinea Impatiens production for most growers is the 4″ or 4½” pot with one rooted cutting per pot, though 5″ and 6″ pots may be produced depending on market demand. Five inch pots may have 1 or 2 cuttings and 6″ pots 1 to 3 cuttings per pot depending on cutting costs verses production timing. New Guinea Impatiens may also be grown in Jumbo finishing flats or 3-3½” pots for the mass market. Hanging baskets of New Guinea Impatiens are also popular with 1 to 3 cuttings per 8″ basket, 1 to 4 cuttings per 10″ basket, or 3 to 5 cuttings per 12″ plastic basket.

Medium: Use a peat-lite medium composed of peat and perlite, vermiculite, bark, or rockwool. The medium should be well-drained and aerated, but with slightly more water holding capacity than for some crops. Impatiens as a rule require a lot of water and should never wilt, extra water holding capacity facilitates this goal. Dolomitic lime to a pH of 5.8 to 6.2, superphosphate (4.5 lbs./yd3) , and micronutrients (½-¾ recommended rate) are added to the medium at mixing. Medium pH should not drop below 5.8, especially if manganese and iron concentrations are above 3.0-5.0 ppm because New Guinea Impatiens are sensitive to micronutrient toxicity.

Fertilization: Little or no fertilization is required until the roots of plants in the final container reach the pot margins. Fertilizer on a CLF program at 100-150 ppm nitrogen with the nitrogen level about equal to potassium (150-0-150 to 200-0-200) with no phosphate if superphosphate was added during mixing. If superphosphate was not added to the medium, liquid feed with 50 to 75 ppm P. If fertilizer is not applied at every watering, use 300 to 350 ppm N, 100 ppm P, and 300 to 350 K every third watering. Be careful using a fertilizer containing micronutrients if they were added during media mixing. Micronutrient toxicity cause necrosis of lower leaves or leaf margins, shoot die-back, or distorted, stunted upper leaves. Magnesium deficiency is common and may be corrected using 8 oz. Magnesium sulfate / 100 gal. once per month.

Temperature: Night temperatures should be 68F and day temperatures 75F for the first 2 to 3 weeks. The night temperature can then be dropped to 65F. Night temperatures above 72F can delay flowering. New Guinea Impatiens respond to DIF. Stem lengths increase as the day temperature increase relative to the night temperature (positive DIF).

Photoperiod: No significant response found.

Light: New Guinea Impatiens tolerate higher light intensities than bedding Impatiens. As much light as possible should be provided in the winter and spring. Provide a minimum of 3000-4000 foot-candles during the middle of the day. Low light reduces varigation in the foliage and slows flowering. Apply shading if light exceeds 6000 foot-candles.

Pinching: Newer cultivars are self-branching and require no pinching. Pinching will delay bloom by two to three weeks.

Growth Retardants: Generally not required or used on New Guinea Impatiens. Cycocel, B-Nine, and A-Rest show minimal effect, however, Bonzi is effective at 5 to 30 ppm.

Supplemental Light and Carbon Dioxide: Supplemental light from HID lamps benefits growth at 400 ft.ca. after rooting in propagation. Supplemental carbon dioxide also improves growth at 1000-1500 ppm. A 2-3F increase in day temperature should be used with supplemental CO2.

Spacing: Spacing too close will result in stretching. Newely potted cutting can be maintained pot-to-pot until the canopies begin to close.

Common Problems      

Physiological: Low light and low fertility cause mottled foliage. Water stress causes leaf and flower bud abscision.

Pests: Spider mites, cyclamen mites, thrips, mealybugs, and aphids all infest New Guinea Impatiens

Diseases: Pythium, Phytophthora, and all cause root rots. Rhizoctonia causes stem rots. Impatiens Necrotic Spot Virus (INSV) can be very serious and the virus is carried by Thrips. Botrytis can be a problem under cool, humid conditions.

Scheduling                   

Varies with geographic location, container size, cultivar, climate, and number of cuttings per container, e.g. 4″ pots can be finished in 8-10 weeks in warmer times of the year while requiring 10-16 weeks in low-light, cooler times of the year.

Auburn EDU

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Impatiens Photo Gallery

Impatiens Photo Gallery

Most of the photos are taken from the website Proven Winners simply because of the absolutely unbelievable amount of the varieties they carry.  Do visit their website, it’s amazing.

Infinity Series

       

Scarlet             Orange Frost    Pink Frost       Infinity Blushing

Jelly Bean Series

     

Cherry Rose          Orange                Rose                     Red

Little Lizzy Series

          

Cherry Butterfly            Orange                          Orchid Butterfly

         

White                            Violet Star                    Pink

       

Salmon                           Rose                            Violet

       

Orange Nova                 Cherry                           Red

Double Up Series

   

Red Bi-Color                    Double Up Apple                Salmon

    

Violet Bi-Color                  Peach                              Peach  Frost          

     

Passion                             Rose                                   Pink

     

Bridal Pink                       Violet                                    White

This is just a sampling of the beautiful and complete collection you will find at the Proven Winners gardening website.

 

Growing Impatiens in a Container

   Growing Impatiens in a Container    

For those with a limited growing area, or other who have a patio they would like to add some color and beauty too, impatiens are an excellent container flower.

Tips for Container Gardening              

When putting planting a container garden, real soil is a no-no.

Instead, choose a soil-less mix – a lightweight combination of peat moss, vermiculite and perlite – sold as patio or container mix.

The potting mix should be fluffy and just moist for planting.

Place a piece of broken pottery or small stone over drainage hole to prevent mix from leaking out.

 

  • Fill container three quarters
    with potting mix, keeping it fluffy (don’t press down too hard). Remove plants from pots, gently teasing roots apart if necessary, and place inside container.

     

  • Container garden plants are asked to produce masses of flowers in a tight space, so be sure to fertilize. The easy way is to mix slow-release fertilizer pellets into the top couple of inches of potting soil. (Follow package directions for amount.) The fertilizer beads are covered with a coating that gradually releases nutrients all season long.

     

  • Fill gaps between container garden plants with potting mix, firming down gently. Avoid packing pots right up to the rim – leave about an inch free as a reservoir for easier watering.

     

  • To finish, water. Throughout the season, check your container garden pots daily and water until water comes out through the drainage hole.

 The best pots for your container garden        

 

Choose good sized container so your plantings can be more interesting, and for easier maintenance. Bigger containers don’t dry out so quickly.

 

  • Terra cotta: A time-honored classic material that’s porous and allows oxygen to get to roots. However terra cotta is heavy and easily chipped or broken and generally not frost-proof, so store indoors in winter. The best terra cotta comes from Italy.

     

  • Glazed ceramic: This material has the same advantages and disadvantages as terra cotta. Available in many attractive colors. Not frost-proof, needs indoor storage for winter

     

  • Plastic and molded polyethylene (fake terra cotta or stone): Light, easy to move, polyethylene looks like real thing. It doesn’t chip or break and is frost-proof. Not porous like terra cotta, so good drainage is essential. Raise pot on blocks so drain holes not obstructed. Go for quality as cheap plastic pots degrade quickly in UV rays

     

  • Wooden barrels & window boxes: Attractive, readily available; can be built to sizes and shapes that suit the location. Large-sized containers heavy to move. Deteriorates quickly unless protected from moisture, so line interior with plastic sheeting

                                                               

 

 

Contain Yourself

By Diana Lawrence
Extension Master
Gardener
University of Vermont

The idea of container gardening never occurred to me until I purchased my first home. I ran out to the local garden center and did what everyone else did. I bought a clay pot, put some soil in it, and stuck in a “spike,” some vinca vine, and a few impatiens. .

I threw some water on it once every few days and felt like a homeowner. Then at the end of the season, I dumped everything out and left the clay pot outside. Of course, it crumbled in the freeze-thaw cycle of winter. Then we moved to Vermont. That’s where I got serious about container gardening .

What’s the appeal of going potted? Let me count the ways. .

First off, container gardening allows you to garden in a small area with or without earth. You may have a nice big deck, a yawning porch, or a tiny apartment balcony. Whatever space you’re faced with, no matter if it’s shady or sunny, there’s room for a pot or two (or ten). Trees, shrubs, flowers, bulbs, ornamental grasses, herbs, vegetables–if it grows, you can grow it in a pot .

Gardening in containers also offers instant gratification, and let’s face it, what gardener hasn’t picked up a flat of gorgeous little annuals because they were in full bloom, full size, and just waiting to perk up that boring bit of the bed? You buy the plants, you put them in the pot, and they look beautiful right away and keep getting better .

Pots also enable experimentation. You can try out new plants, annual or perennial, and see if you like how they look in your backyard. You can move pots around to add color or interest to areas that need it, or foliage to a part of the garden that looks bare. .

Think that gorgeous ‘Karl Forester’ feather reed grass might look great in the corner of your sunny garden? Put it in a pot and see. If it still makes you sigh at the end of the season, just take it out and plant it there .

The other element of container gardening that I find inviting is the creativity it inspires. I don’t stop at annuals. I combine perennials and annuals, plants that are all silver, plants that are all foliage and offer no flowers, the same plant in different colors, or plants with wonderful fragrance. Some years I’ll take a flower and put some of it in every pot I have. Other years I’ll make every container a “specimen.” I also use fall-blooming plants to keep the color going through the first frost. .

And although I always stick to pots, you can plant your combinations in any kind of container, as long as it drains well and won’t fall apart when it’s wet. At a local nursery I frequent, someone with a low boredom threshold has potted up old golf bags, suitcases, handbags, boots, and baby prams–even the seat of a chair .

When I put up a pot, I use potting soil, which drains easily (I have reused potting soil several years in a row, since it is a growing medium, and not a major source of nutrients). I mix the bottom half of the soil with polymer crystals, which help retain water, and slow-release fertilizer capsules. I don’t bother putting either one of these elements near the surface of the soil, since it’s the roots that need the food and water. A friend of mine showed me how to rip up a plastic plant six-pack and place the sections upside down at the bottom of the pot to prevent the mix from running out and clogging the drainage hole, and this works like a charm .

I sometimes buy my plants with a plan in mind, but most often I just head for the greenhouse and play around with combinations of plants when I get there. It can be frustrating (and limiting) to hunt for a specific plant and not be able to find it. Remember, when it comes to pots, the more plants the merrier. .

Unlike perennials in the garden, you don’t start out with small plants and wait for growth over several seasons. In my container gardens, it’s standing room only. Look for plants with striking foliage, cascading growth habits, and unusual textures. Flowers fade, but a great looking artemesia holds its own all summer .

I choose large containers because they need less frequent watering, and because I think a lot of small pots can look cluttered. I also like to use large perennials and ornamental grasses (I put these into the garden in the fall), and they don’t fit in smaller pots. Whatever size you choose, remember that container gardens are hardly maintenance free. .

They dry out quickly in warm weather and should be watered until the water runs out the bottom of the pot. You should also fertilize your containers once a week all summer long (this includes hanging baskets). Now, aside from all these wonderful elements, here comes the best part about container gardening: no weeding!

Extension Master Gardener Diana Lawrence lives and garden is Grafton, Vermont .

Backyard Gardner               

 

              

 

 

    

 

When Can I Plant Impatiens?

    When Can I Plant Impatiens  

The central rule of thumb is to plant after the last day of expected frost in your area.  Remember, impatiens are frost sensitive.  A few days too early can mean the difference between a beautiful flower garden….and a disaster. 

Planting Zone Map

Learn what planting zone you live in:

Knowing your planting zone can be very useful when your are planning your garden and flower bed areas.

When you order plants online or through a catalog it is very useful for you to know what will have the best success in your zone. 

Most plants are marked with a zone number. Use this map to know what plants will do best in your zone.

USDA PLANTING ZONE MAP

Using the Zone Map is really very simple. Find your geographic location on the map. Observe the corresponding color to that location. Look at the map key. That number designates the zone in which you live. 

You should select products that can survive in your zone. Simply read the item description and you will find a either a zone number or a range of zones. The lower of the the two zone numbers tells you the lowest recommended zone in which that plant can survive. Sometimes, an item will thriveoutside that zone area. Remember this is only a guide.

For more information visit:

Indicator Plant Examples Listed by Zone

Plant Hardiness Zones, Details

From: Plant Power

AVERAGE DATES OF FIRST AND LAST FROST
NOTE: The dates below are for the Northern Hemisphere
(Adjust appropriately for Southern Hemisphere)
Zone 1
Average dates Last Frost = 1 Jun / 30 Jun
Average dates First Frost = 1 Jul / 31 Jul Note: Vulnerable to frost 365 days per year

Zone 2
Average dates Last Frost = 1 May / 31 May
Average dates First Frost = 1 Aug / 31 Aug

Zone 3
Average dates Last Frost = 1 May / 31 May
Average dates First Frost = 1 Sep / 30 Sep

Zone 4
Average dates Last Frost = 1 May / 30 May
Average dates First Frost = 1 Sep / 30 Sep

Zone 5
Average dates Last Frost = 30 Mar / 30 Apr
Average dates First Frost = 30 Sep / 30 Oct

Zone 6
Average dates Last Frost = 30 Mar / 30 Apr
Average dates First Frost = 30 Sep / 30 Oct

Zone7
Average dates Last Frost= 30 Mar / 30 Apr
Average dates First Frost = 30 Sep / 30 Oct

Zone 8
Average dates Last Frost = 28 Feb / 30 Mar
Average dates First Frost = 30 Oct / 30 Nov

Zone 9
Average dates Last Frost = 30 Jan / 28 Feb
Average dates First Frost = 30 Nov / 30 Dec

 

Zone 10
Average dates Last Frost = 30 Jan or before
Average dates First Frost = 30 Nov / 30 Dec

Zone 11
Free of Frost throughout the year.

Best of the Home

 

Growing Impatiens From Seed

     Growing Impatiens From Seed   

Growing impatiens from seed is a good way to save money if you like to plant flats and flats of these popular annuals.

The ideal time to start the seeds is eight to 10 weeks before the last frost in your area.

Fill seed flats with a sterile seed-starting mix that you have moistened. It should be damp but not wet.

Impatiens seeds are very tiny, so scatter them over the surface and press down lightly. If you’ve used flats from a seed-starting kit, just cover them with the plastic cover that came with this.

If you’re planting in containers that you are reusing, be sure they are sterile (wash them in water with detergent and a little bleach), and cover them with plastic wrap after sowing, or put the entire flat into a clear plastic bag.

Impatiens from seed – light and temperature

Place your flats under grow lights or near a window where they get bright indirect light. The soil temperature should be about 70 to 75º F (21 to 24º C).

Your impatiens seeds should sprout within seven days to two weeks, although it can sometime take a little longer if temperatures are cooler.

Remove the plastic cover or plastic wrap as soon as the seedlings germinate. Impatiens seedlings are very susceptible to a fungal disease called damping off, so be very careful not to over water them. Bottom watering is best.

Once your seedlings have several new leaves, transplant them into flats in cell pack containers filled with growing mixture. Transplant one plant per cell. Fertilize regularly with a balanced house plant fertilizer.

Impatiens from seed – ready for the garden

 

Before transplanting your impatiens outdoors, be sure to harden them off. (For more information on this, click here.)

Wait until the danger of frost is past before planting your impatiens in the garden. When temperatures are safely above 50º F (10º C), impatiens will thrive, and they will continue to bloom profusely until frost.

Seed-starting made easy: How to care for sprouted seedlings

As soon as you notice germination and your seedlings beginning to grow, remove the plastic dome or plastic bag over your planting trays.

Check daily for moisture, but avoid the temptation to over-water.

Soggy soil, excess warmth and poor air circulation can lead to damping off, a common fungal disease that can kill baby plants.

Prevention goes a long way, and you can use a fungicide called No Damp to help combat this.

The right growing conditions: temperature and light

Most young plants grow best at day-time temperatures between 70 to 75ºF (21º to 24ºC) and night-time temperatures between 55 to 65ºF (13º to 18ºC).

For healthy, bushy growth, seedlings need plenty of light, and they’re more likely to get it under fluorescent lights than on a windowsill.

You don’t have to use expensive grow lights:
ordinary cool-white 40-watt fluorescent tubes do nicely, as the young plants will only need to grow under them for a few weeks.

Shop lights that hang from chains on a light stand are ideal. The chains allow you to adjust the lights to keep them right above the seedlings.

Keep plants as close to your lights as possible: This helps prevent plants from growing weak, spindly stems from stretching too. Set your lights on an automatic timer set to be on for 18 hours and off for six hours.

When to start giving fertilizer: When seedlings have two sets of true leaves (the first leaves are called cotyledons or seed leaves), start fertilizing once a week with half-strength liquid plant starter or fish emulsion fertilizer.

Tranplanting: If necessary, transplant seedlings into their final pot once they have their second set of leaves. Always handle young plants by the leaves, as the roots and stems are very tender.

How to get seedlings ready for the “real world”

As planting-out time in the flower garden nears, coddled plants raised indoors need to be toughened up or “hardened off.”

  • To do this, set your plants outside in a shady, sheltered spot for at least a week or two before transplanting into the garden.

     

  • Give your plants half a day outdoors at first, and gradually leave them out longer, slowly moving them into sunnier and windier areas to get them used to life in the real world.

     

  • Once they’re outside for good, protect them by covering them on cooler nightswith a sheet or putting them into a closed cold frame.

     

  • Cool-season annuals such as pansies and snapdragons should be hardened off several weeks before tender, heat-loving ones such as impatiens or tomatoes.

Flower Gardening Made Easy

These varieties are from: Proven Winners Seeds

                 

                   

 

New Impatiens for 2007

New Impatiens for 2007

New Impatiens Introductions: Simply Beautiful Fusion & Fanfare Impatiens Series

Impatiens with Orchid Like Blooms and Tropical Colors (Even Yellow!) Impatiens are a garden favorite because they deliver long lasting color in shade. Reds, pinks, lavenders and pure white Impatiens will brighten any dark corner throughout the growing season. Impatiens have indeed become a garden standard.

The breeders at Ball Horticultural Company have recently introduced two new series of Impatiens that are testing very positively. They are both released under the Simply Beautiful brand name: Simply Beautiful Fusion™ series and Simply Beautiful Fanfare™ series.

Simply Beautiful Fusion

The Fusion Impatiens series has the distinction of offering the first yellow Impatiens flowers. It took breeders years to isolate and stabilize Fusion Impatiens ‘Glow’ from its  wild parent, but it was worth the effort.       From their effortscreating “glow” came a whole series of exotic warm colors. Fusion ‘Radiance’ is coral with a rust center. Fusion ‘Infrared’ is a darker coral with shades of yellow and orange. Then there’s Fusion ‘Sunset’ in apricot with a maroon center and Fusion ‘Heat’ which is a stunning rusty orange with a yellow center. The series looks almost tropical.
The Fusion series still has the non-stop blooming power of traditional Impatiens, but the flowers are an interesting cup shape with a deeper colored center. Ball likens them to orchid shaped flowers.
Mature plants will reach 12 – 16″ in height and width.
Maintenance of the Fusion Impatiens Series.
The Fusion series is as undemanding as common Impatiens, but since these annual flowers are going to bloom until frost, you’ll want to give them a rich, well drained soil to grow in.

You can amend the soil with organic matter or use a slow-release fertilizer when planting.

  • Mulch after planting and give them a light feeding every 6 – 8 weeks.
  • Fusion Impatiens enjoy a little sun in the morning, but prefer afternoon shade.
  • Heat and humidity don’t seem to faze them.
  • If they should begin to look leggy toward the end of summer, Fusion Impatiens can be rejuvenated by shearing them back by about 1/3. New growth and flowers will follow shortly.
  • To find a garden center that carries the Fusion Impatiens Series, check the

    Simply Beautiful website. Keep reading to learn about the trailing  Fanfare Impatiens Series.               

    Trailing Impatiens: Simply Beautiful Fanfare Impatiens Series

    Perfect for Hanging Around in the Shade

    Simply Beautiful Fanfare

    Maintenance of the Fanfare Impatiens Series

    The exciting news about the Simply Beautiful Fanfare Impatiens series is that they are spreaders and trailers. These Impatiens look incredible in hanging baskets and containers. Of course they are equally at home in beds and since they spread, you’ll need fewer to cover the same amount of space as traditional Impatiens. They have the added bonus of handling heat better than common Impatiens.

    The Fanfare Impatiens series comes in 6 colors: Fuchsia, Blush, Lavender, Orange, Pink Sparkle and the latest, Bright Coral. Mature plants reach a height of 16 – 20″ and can spread up to 2 feet.

    As with the Fusion Impatiens series Fanfare Impatiens are no fuss plants. keep in mind that flowers that bloom profusely benefit from a rich soil and some periodic supplemental feeding during the growing season.

    • You can amend the soil with organic matter or use a slow-release fertilizer when planting.
    • Mulch after planting and give them a light feeding every 6 – 8 weeks.
    • Fusions Impatiens enjoy a little sun in the morning, but prefer afternoon shade.
    • Heat and humidity don’t seem to faze them.
    • If they should begin to look leggy toward the end of summer, Fusion Impatiens can be rejuvenated by shearing them back by about 1/3. New growth and flowers will follow shortly.

    To find a garden center that carries the Fanfare Impatiens Series, check the Simply Beautiful website.     

    garden about.com

    Other New Varieties Include:

    Devine Pink             Envoy Cherry              Extreme Utopia

            

    website

     

    Diseases of Impatiens

           Diseases of Impatiens   

    Disease Symptoms Pathogen/Cause Management
    Alternaria Leaf Spot Target-like spots, often with purple or dark-colored borders form on the leaves. Alternaria spp. Reduce humidity and maintain good air circulation. Do not space plants too closely. Remove fading flowers and yellowing leaves. Apply iprodione, mancozeb, or triflumizole to protect plants. If plants are not flowering, chlorothalonil can be applied.
    Botrytis Blight Flowers are spotted and stems rot. Botrytis cinerea Reduce humidity and maintain good air circulation. Do not space plants too closely. Remove fading flowers and yellowing leaves. Apply iprodione to protect plants. If plants are not flowering, chlorothalonil can be applied.
    Bacterial Fasciation Plants are stunted and have many short shoots at the crown. Corynebacterium fascians Discard infected plants. Do not propagate from infected plants. Propagate and plant in pasteurized potting media.
    Damping-Off Stems at the soil line die and plants collapse. Pythium or Rhizoctonia Plant in pasteurized potting media. Keep hose ends off the ground. Apply etridiazole + thiophanate methyl to protect plants.
    Necrotic Spot Ring spots on leaves. Growing tips may die. Severe stunting. Impatiens necrotic spot virus Discard infected plants. Control thrips that carry the virus. Do not propagate from infected plants.
    Powdery Mildew (New guinea impatiens) White, mealy fungal growth develops on the top of leaves. Sometimes, heavy gray growth develops.  Oidium Apply triflumizole to protect plants. If plants are not flowering, chlorothalonil can be applied.
    Pythium Root Rot Lower leaves wilt, leaves fall and the plant dies. Pythium spp. Pot in pasteurized, pathogen-free media. Keep hose ends off the ground. Apply mefenoxam or fosetyl-Al to protect healthy plants.
    Rhizoctonia Stem Rot Stems wilt and collapse.  Rhizoctonia Pot in pasteurized, pathogen-free media. Keep hose ends off the ground. Apply PCNB.
    Thielaviopsis Root Rot Roots become dark brown and rot as microscopic spores form in the cells. Lower stems have sunken lesions when infected. Thielaviopsis basicola Pot in pasteurized, pathogen-free media. Keep hose ends off the ground. Apply etridiazole + thiophanate methyl or triflumizole to protect plants.
    Verticillium Wilt Lower leaves yellow and fall. Infected plants may recover. Verticillium dahliae Pot in pasteurized, pathogen-free media. Do not take cuttings infected plants.

    psu.edu