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Plant Doctor - Greenhouse Basil Downy Mildew

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Publication Number: P2936
View as PDF: P2936.pdf

Greenhouse Basil Downy Mildew

Most common seasons

Late fall, winter and early spring.

Weather

A number of days with rains and high humidity, especially originating from the Gulf of Mexico. Temperatures between 53°F and 77°F.

Basil types affected

Especially bad on sweet basil.  Colored types and other species are not so susceptible.

Quick symptoms

Chlorotic (yellow) area in center (mid-rib) of leaf. May develop fuzzy gray growth on underside of leaves. In very conducive situations, fuzzy growth may be on upper leaf surface, as well.

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Authors

Extension Professor
Extension Plant Pathologist, Disease management of ornamentals,peanut, turf,fruits, nematode program

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