Log In   ·   Become A Member

Beating The Great Hamptons Impatiens Blight

Downy mildew is destroying ever-popular bedding impatients like these across the US. (Photo: Dreyerfarms.com)

Did you plant impatiens in your yard last year? Did it die...suddenly? It wasn't your fault. What happened? A fungus disease, downy mildew, devastated impatiens across the eastern U.S. Last summer downy mildew spread through impatiens plantings in more than 30 states in the eastern US, including New York. It wiped out impatiens all over the Hamptons.

How Does It Spread?

Downy mildew thrives in moist, humid, cool conditions - typical spring weather here. When plant leaves are wet for four hours, perhaps as a result of overnight sprinkler system operation, the infection can spread. When plants are close together as in a garden bed, the disease is easily passed along. Splashing water can spread the disease spores over short distances, and wind can carry them farther.

How to Spot It

Bedding impatiens is hard to find on the East End this spring, and homeowners in the know are looking for alternatives. If you did find some and plant it, keep a close eye on your plants. If you spot any of the following symptoms on any of your plants, pull up the affected plants immediately, including all the roots, seal them into plastic bags and dispose of them with your household garbage. Do NOT put any diseased plants on your compost pile or toss them on the ground.

Look for yellow leaves, white powdery film under the leaves, and curled leaves. (Photo: Michigan State University Extension)

Here's what to look for:

- Impatiens leaves begin to turn yellow, and yellow stippling, or spotting, appears. It resembles damage caused by spider mites, or by insufficient fertilizer.

- The plant's upper leaves curl downward, and the plant looks dry, like it needs more water.

- Leaves and flowers drop off the plant until it is left with bare stems and maybe a few leaves at the top.

- In the end the stems collapse. The plant dies.

This process happens fast. The plants may look fine on Friday and be dead by Monday. It's important to get infected plants out of the garden as soon as you spot them, to prevent the disease from coming back next year. Along with the active mildew spores, the disease produces another type of spore inside infected plants before they die. This second kind of spore survives in the soil over winter and starts a new round of infection in spring. To stop the disease you have to get rid of these survival spores as well as the active disease spores.

The Good News

OK, here's the good news. Downy mildew is host-specific and attacks only particular plant species. Brilliant-colored New Guinea impatiens are not affected so you can plant them instead. Another good substitute is wax begonia, which thrives in shade or sun, and so far is not on the deer menu. They come in red, pink or white. Nonstop and tuberous begonias also thrive in shade and bloom lavishly in hot colors. Torenia has rich purple flowers that resemble tiny gloxinias. There's also coleus, whose colorful foliage comes in shades of green, red, maroon, orange, purple, pink, gold and white in varying combinations and patterns. These plants look terrific all season long and need little care.

Taking a break from impatiens offers a chance to try something new in your shady garden. Embrace the change!

Anne is a writer, editor and professional gardener, and the author of 17 garden, home and nature books. She lives in Hampton Bays.

Be the first to comment on this article. (Just fill out the form below)

Submit Your Comment

Please note, you are not currently logged in. Your comment will be submitted as a guest.
To submit your comment as a member, please click here.
Your Name:
* Comments will be reviewed and posted in a timely fashion
* All fields are required
What color is a firetruck?
(For spam prevention, thanks)
East End Tick Control
The East End's only New York State licensed dedicated tick and mosquito control specialists!

Hamptons Carpet One Floor & Home
We pay less,and so do you.With over 1,000 stores in our buying group, we can get the lowest prices from the best flooring manufacturers and pass the savings on to you.Visit our other locations: Hamptons Carpet One Floor & Home, 675 North Sea Road,Southampton, NY 11968

CP Complete- Landscape Design & Construction
Paul Guillo And Chris Hall Two Of The Most Respected Names In The Community Together, they are partners in CP Complete. They bring their years of experience and integrity to creating and renovating luxury backyards.

Hamptons luxury real estate specialist for 33 years, Andrea Ackerman offers outstanding expertise in the field.
Hamptons luxury real estate specialist for 33 years, Andrea Ackerman offers outstanding expertise in the field. Trusted, experienced and successful, Andrea has solidified herself as the go-to broker of the Hamptons and a wholehearted advocate for her clients. A pioneer in the real estate industry on the East End of Long Island, she is driven by her passion for the business. Andrea is based in the Bridgehampton office of Brown Harris Stevens as a licensed real estate associate broker and consultant. Formerly, a principal partner and Senior Director at Brown Harris Stevens, Andrea now assists in developing their corporate strategy for the Hamptons region, advising other brokers and sales associates, as well as being one of the top producers and listors.

Brown Harris Stevens is the quintessential luxury real estate firm, with a history of leadership and a culture of professionalism and discretion dating back to 1873
Brown Harris Stevens is the quintessential luxury real estate firm, with a history of leadership and a culture of professionalism and discretion dating back to 1873. At every level of Brown Harris Stevens, you will find highly experienced, knowledgeable experts, single-mindedly devoted to your interests and your satisfaction. With offices in the Hamptons, New York City, Palm Beach, and Miami our brokers are exceptional - leading the field with the quality of their work ethic, their outstanding success rate and the sheer quantity of their transactions.

Southrifty Drug 54 Jagger Lane, Southampton Village
Southrifty Drug is a small, neighborhood pharmacy with limited shelf space, and we have to be very selective about which over-the-counter items we carry. As a result you'll find a no nonsense concentration of very effective, high quality and useful products on our shelves. In this new section, we feature a number of these products that we feel are especially worthy of your consideration.