Powdery Mildew On Zucchini

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Powdery Mildew On Zucchini

The white spots on your squash are probably powdery mildew. This fungus is common to squashes especially if the foliage is wet at night. Drier weather will help. The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.
Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.


By | 2016-04-03T23:53:43-07:00 April 3rd, 2016|Plant Diseases|0 Comments

Powdery Mildew On Zucchini

The white spots on your pumpkin are probably powdery mildew. This fungus is common to squashes especially if the foliage is wet at night. Drier weather will help. The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.
Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.


By | 2016-03-17T15:20:25-07:00 March 17th, 2016|Plant Diseases|0 Comments

Powdery Mildew On Zucchini

Your problem is likely powdery mildew, an opportunistic but difficult disease. Powdery mildew first appears as pale yellow spots on stems, petioles, and leaves. These spots enlarge as the white, fluffy mycelium (fungus) grows over plant surfaces and produces spores, which give the lesions a powdery appearance. If not controlled plants may die. There are remedies ranging from selection of resistant varieties to sprays of neem oil in the early stages. At this stage, suggest you take off the affected leaves, begin spraying the plants, and try to arrest the disease to save the crop. When you do spray, spray in the late afternoon or early evening to prevent sun scald on the foliage. It may be too late, but we hope you can save your zucchini plants.

By | 2016-03-17T03:56:37-07:00 March 17th, 2016|Vegetable Plants|0 Comments

Powdery Mildew On Zucchini

It is probably powdery mildew. This fungus is common to squashes especially if the foliage is wet at night. Drier weather will help.Trim off the damaged leaves. There are several organic fungicides that are labeled for powdery mildew including Actinovate, Serenade, sulfur, and Green Cure, or ask at your local garden center. Be sure to spray under the leaves and the stems as well.

The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.

Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.


By | 2016-02-13T12:26:08-08:00 February 13th, 2016|Plant Diseases|0 Comments

Powdery Mildew On Zucchini

It is probably powdery mildew. This fungus is common to squashes (and cucumbers, which are in the same family), especially if the foliage is wet at night. Drier weather will help, but if many leaves are affected, fungicide sprays will arrest its progress and allow you to harvest.
Trim off the damaged leaves. There are several organic fungicides that are labeled for powdery mildew including Actinovate, Serenade, sulfur, and Green Cure, or ask at your local garden center. Be sure to spray under the leaves and the stems as well.

The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.

Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.


By | 2017-09-11T15:49:26-07:00 January 19th, 2016|Plant Diseases|0 Comments

Powdery Mildew On Zucchini

It is probably powdery mildew. This fungus is common to squashes, especially if the foliage is wet at night. Drier weather will help, but if many leaves are affected, fungicide sprays will arrest its progress and allow you to harvest.
Trim off the damaged leaves. There are several organic fungicides that are labeled for powdery mildew including Actinovate, Serenade, sulfur, and Green Cure, or ask at your local garden center. Be sure to spray under the leaves and the stems as well.

The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.

Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.

Other methods of coping with it: pick off affected plant parts and either compost them in a hot compost pile or bag them tightly and put them in the trash. Or create a spray of 1 part milk with 9 parts water and spray the stems and tops of leaves with the solution. Reapply after rain.

By | 2017-09-11T15:49:28-07:00 January 6th, 2016|Plant Diseases|0 Comments

Powdery Mildew On Zucchini

There appears to be powdery mildew on the leaves. This fungus is common to squashes, especially if the foliage is wet at night. Drier weather will help, but if many leaves are affected, fungicide sprays will arrest its progress and allow you to harvest.
Trim off the damaged leaves. There are several organic fungicides that are labeled for powdery mildew including Actinovate, Serenade, sulfur, and Green Cure, or ask at your local garden center. Be sure to spray under the leaves and the stems as well.

The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.

Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.

Other methods of coping with it: pick off affected plant parts and either compost them in a hot compost pile or bag them tightly and put them in the trash. Or create a spray of 1 part milk with 9 parts water and spray the stems and tops of leaves with the solution. Reapply after rain.

By | 2017-09-11T15:49:29-07:00 January 6th, 2016|Plant Diseases|0 Comments

Powdery Mildew On Zucchini

It is probably powdery mildew. This fungus is common to squashes (and cucumbers, which are in the same family), especially if the foliage is wet at night. Drier weather will help, but if many leaves are affected, fungicide sprays will arrest its progress and allow you to harvest.
Trim off the damaged leaves. There are several organic fungicides that are labeled for powdery mildew including Actinovate, Serenade, sulfur, and Green Cure, or ask at your local garden center. Be sure to spray under the leaves and the stems as well.

The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.

Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.

Other methods of coping with it: pick off affected plant parts and either compost them in a hot compost pile or bag them tightly and put them in the trash. Or create a spray of 1 part milk with 9 parts water and spray the stems and tops of leaves with the solution. Reapply after rain.

By | 2017-09-11T15:49:32-07:00 December 1st, 2015|Plant Diseases|0 Comments

Powdery Mildew On Zucchini

This may be environmental damage. Leaf spot such as you see can be caused by something physically hitting the plant, a fungus, or a bacteria. A physical cause would be something such as hot water from a sun-heated hose, a cleaning product such as window cleaner, a fertilizer spray or drift from an herbicide or other garden product. If this is the cause the damage doesn't spread and there is no threat to the plant.

However, if you see it spreading and getting worse, it is probably powdery mildew. This fungus is common to squashes, especially if the foliage is wet at night. Drier weather will help, but if many leaves are affected, fungicide sprays will arrest its progress and allow you to harvest.
Trim off the damaged leaves. There are several organic fungicides that are labeled for powdery mildew including Actinovate, Serenade, sulfur, and Green Cure, or ask at your local garden center. Be sure to spray under the leaves and the stems as well.

The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal.

Powdery mildew can be prevented, and it can be controlled once it appears, but it can't be cured. The key to preventing it is planting mildew-resistant or mildew- tolerant varieties. Resistant varieties get less mildew than susceptible varieties; tolerant varieties may get some mildew, but it shouldn't affect the performance of the plant. Prevention also includes siting plants where they will have good air circulation, and exposing as much leaf surface as possible to direct sunlight, which inhibits spore germination.

Other methods of coping with it: pick off affected plant parts and either compost them in a hot compost pile or bag them tightly and put them in the trash. Or create a spray of 1 part milk with 9 parts water and spray the stems and tops of leaves with the solution. Reapply after rain.

By | 2017-09-11T15:49:33-07:00 November 27th, 2015|Plant Diseases|0 Comments