Powdery mildew

A picture of a grape leaf plant infected with powdery mildew

English name: Powdery Mildew

The scientific name: Errecife Nicator (Uncinola Nicator) Erysiphe necator(Uncinula necator)

The type of disease: A fungal disease



Powdery mildew appears as grayish-white powders on the upper surfaces of leaves and stems

And fruit clusters. Affected leaves may become disfigured, turn yellow or red, and eventually fall. On fruit, the fungus can cause russeting, cracking, and poor growth, resulting in reduced quality and yield.

Powdery Mildew Can Destroy Grapes - Stanislaus Buds - ANR Blogs
Powdery mildew of grapes | Ohioline
How to control powdery mildew in vineyards
Powdery mildew - grapes | Treatment of disease Bayer Crop Science...


Powdery mildew is caused by the necator fungus Erysiphe (formerly known as Uncinula)necator, an obligate parasite that requires living host tissue to survive.

Propagation conditions

Powdery mildew prefers warm, dry conditions with temperatures between 70°F and 85°F (21°C and 29°C) and high relative humidity. The fungus produces numerous spores (conidia) that can be spread by wind, rain, or human activity.

Disease course

Powdery mildew fungi overwinter as cleistothecia (fruiting bodies) on bark, buds or debris in the vine. In the spring, these fruiting bodies release spores that initiate the first infection. The fungus then produces conidia that spread the disease throughout the growing season. The disease cycle continues as long as suitable conditions persist.


Severe powdery mildew infection can lead to decreased photosynthesis, premature defoliation, poor fruit set, and reduced fruit quality, resulting in significant yield and economic losses.

Control strategy

An integrated approach that includes cultural practices, resistant varieties and fungicide applications is recommended for powdery mildew management.

Preventive measures

Plant resistant or tolerant varieties, ensure good air circulation in the vineyard, and avoid excessive nitrogen fertilization.

Organic/chemical control

For organic control, sulfur-based fungicides (eg wettable sulfur, sulfur of lime) can be effective when applied preventatively. Chemical fungicides containing active ingredients such as myclobutanil, quinoxifen, or trifloxystrobin may also be used according to label instructions.


http://ipm.ucanr.edu/PMG/r302101311.html https//www.uncovercolorado.com/wp-content/uploads/2021/06/grape-


Leave a Reply

Your email address will not be published. Required fields are marked *

Post comment