What causes white spots on the leaves?
In the height of the summer, zucchini is difficult to kill and even harder to use, making it a difficult crop to harvest.Despite its reputation for being almost weed-like, zucchini suffers from pests and diseases.There are many possible causes for the silvery spots on your zucchini's leaves.
In the height of the summer, zucchini is difficult to kill and even harder to use, making it a difficult crop to harvest.Despite its reputation for being almost weed-like, zucchini suffers from pests and diseases.There are many possible causes for the silvery spots on your zucchini's leaves.
As zucchini plants mature, the oldest leaves often have silver or grey spots on their upper surfaces.This is a sign of a mature leaf and there is no disease or pest present.If the silver areas are not accompanied by insects feeding on the underside, the leaf is not likely to be sick.
The fall is when powdery mildew is more likely to appear.Pale yellow leaf spots are covered in white, fluffy or powdery matter.As soon as these spots appear, triflumizole or myclobutanil applications will treat powdery mildew in conventionally grown gardens.
One-tenth of an inch long, leafhoppers are small, wedge-shaped insects.Their feeding causes white stippling that can form large spots or become silvery when viewed from a distance.Since zucchini can tolerate high leafhopper loads as long as the plants are getting adequate hydration, pesticides are rarely advised.
Spider mites attack a wide range of plants.Areas on leaves that start from the underside and move up through the top of the leaf are caused by spider mite damage.It is possible that leaves will eventually dry up and die.Spider mite populations explode when pesticides are applied to gardens, so encourage predator populations by eliminating the use of broad-spectrum pesticides.Sulfur sprays are safe if populations reach intolerable numbers.
Thrips, small insects only about twenty-fifth of an inch long, cause silvering on zucchini leaves with their rasping mouthparts.Downward curling leaves can be caused by damaged surface cells.Control is discouraged unless damage is severe because some thrips feed on spider mites.The best way to treat thrips is with Spinosad in rotation.