zucchini diseases

Zucchinis are often grown alongside summer squash for the retail market. Often planted at intervals throughout the spring and early summer to maintain a constant source of the fruit. A common crop, but not usually grown in large acreages in Indiana. 

Powdery mildew

Powdery mildew-This disease is easily recognized by the white, talc-like appearance of lesions on leaves and stems. Powdery mildew will usually not be severe until plants have been established for some time. Since zucchini plants are often continually planted, by the time the disease is severe on old plants, younger plants are in production. 
Figure 1. Powdery mildew of zucchini. Figure 1. Powdery mildew of zucchini.
Figure 2. Powdery mildew of zucchini. Figure 2. Powdery mildew of zucchini.
Figure 3. Powdery mildew of zucchini. Figure 3. Powdery mildew of zucchini.
Figure 4. Powdery mildew of zucchini. Figure 4. Powdery mildew of zucchini.

Silver leaf

Silver leaf-this symptom is caused by the feeding of the silver leaf whitefly. This whitefly does not overwinter in Indiana. Thus, this symptom is not common and will usually not occur until late in the season. The proper identification of the silver leaf whitefly is critical in the diagnosis of this problem. The silver leaf whitefly may feed on several vegetable crops. 
Figure 1. Silver leaf of zucchini. Figure 1. Silver leaf of zucchini.
Figure 2. Silver leaf of zucchini. Figure 2. Silver leaf of zucchini.
Figure 3. Silver leaf of zucchini. Figure 3. Silver leaf of zucchini.

White mold

White mold-This disease can be recognized by the dark, irregularly shaped fungal bodies known as sclerotia that can be found inside or outside the stem or associated with fruit. In addition, a white mold normally accompanies the sclerotia.
Figure 1. White mold of zucchini. Figure 1. White mold of zucchini.
Figure 2. White mold of zucchini. Figure 2. White mold of zucchini.
Figure 3. White mold of zucchini. Figure 3. White mold of zucchini.