Chief Gardener – Downey Mildew is hitting New York gardens

If you grow pumpkins, you may be familiar with low mold.

Cornell’s garden team has now confirmed that there is rotting mold in western New York.

Most infestation hosts are limited and only one family can be affected. Pseudoperonospora cubensis, for example, is a different species of fungus that affects roses (Peronospora sparsa).

Mold is a major cause of alcoholism and hops. Over the past few years, mold has become a problem in colloquial, bedding, and basil.

The lower mold that affects pumpkins also affects other pumpkins, including cantaloupe, summer squash, zucchini, squash and winter squash. Cucumber mold is a deadly disease for cucumbers.

Leafy mildew is caused by a fungal infection of the omentum, which produces gray, dull spores and mycelium on the underside of the leaves. Those fuzzy, steep spores give it its name.

Died mold is encouraged by long leaf moisture. It requires a certain amount of moisture on the leaf to germinate and infect pathogens.

It grows in wet weather and high relative humidity – remember what July was? It is transmitted by airborne spores, which can last up to two weeks.

Cucumber infestation does not last long in our area, but when the weather is favorable, it can travel from South America to the coast. It usually arrives in New York from July 4 to the end of August.

It can also travel to infected greenhouse plants. It can be spread from plant to plant by spraying water. Downy mildew is very difficult to control once it is established.

Symptoms may vary from plant to plant.

Symptoms of cucumber decay appear 3 to 12 days after infection. Signs of green or yellow lesions begin on the leaf surface.

The lesions follow the leaf’s arteries so they look very corner. They eventually turn brown and the entire leaf dies.

The disease progresses rapidly and planting pumpkins may seem frozen.

Under the right conditions, you may see a dark, purple-gray fuse at the base of the leaf. These are spores.

If cucumber mold is a permanent problem for you, what can you do?

Prior to 2004, it was a major tool in the development of resistant species. Unfortunately, a new wave of stress emerged.

Since then, botanists have been looking for new sources of resistance.

Resistant species do not protect but can produce long-lasting fruit. “Bristol” is showing improved opposition, while Citadel is showing some opposition.

They do not produce male flowers for reproduction, so they both need another variety to be planted with them.

Lender seed must be included in the seed packet. We hope that there will be more species in the future.

Scout plants regularly for the first signs of the disease. Fungal remedies must be applied to the plant – before the disease.

Chlorothalonil is an active fungicide that home gardeners may need. The product of your choice should be used for pumpkin and low mold control.

Follow the label directions for frequency and usage. The use of fungicides can be effective with antibiotics.

At you can track the origin of the cookie mold in the United States. You can also sign up to receive text or email when new outbreaks are confirmed.

Following the website can tell you when to use pesticides as a precaution. Remember, once you find plants, there is no cure.

You can also use traditional practices to reduce the risk of mold growth.

Plant as early as possible in the spring to prevent infection in the summer. We hope you will have a harvest before the rotten mold appears.

Plant plants exactly. Plant the leaves in full sun and good ventilation to keep them from getting wet.

Growing grapes help to increase airflow and dry the leaves. Avoid top irrigation to reduce leaf moisture.

Also, avoid watering at night when the leaves are wet for a long time.

Indoor gardeners should remove infected vines to prevent spores from becoming airborne and contaminating other plants.

Do not mix down mold with flour mold.

In powdery mildew, white, powdery mildew forms on both sides of the leaf. It can quickly cover the entire leaf.

Due to the fungus, powdery mildew can lead to reduced productivity, weakened plants and fruit quality. Older leaves are more vulnerable than young ones.

It can also contaminate grapes and occasionally fruit. Severe infections can cause death of vines.

To combat this disease, they plant pollen-resistant varieties.

If you need help deciding what is wrong with your plant or what treatment to use, please contact your local Cornell Cooperative Office.

Do you have a garden question?

Master gardeners volunteers are usually in the office from 10 a.m. to noon. At 420 E. Main St. , Batavia, at (585) 343-3040, ext. 127, or email us at

CCE Genesee will also provide master gardening training this fall.

Classes will be held Tuesday, September 6-9, from September 7 to November 16. There will also be full classes from October 23 to 9 p.m.

August 24 Pre-registration required. Anyone interested in learning more about gardening can attend.

Class size will be limited.

The room costs $ 225 per person. The editors are currently in the CCE Genesee office, 420 E. Main St. , Plans to conduct physical education in Batavia.

Contact Jan Beglinger at (585) 343-3040 X. For more information 132.


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