Plant Diagnostics

Green Industry - A Knowledge Portal for Commercial Horticulture in Wisconsin (sponsored by University of Wisconsin-Extension)

Green Industry - A Knowledge Portal for Commercial Horticulture in Wisconsin (sponsored by University of Wisconsin-Extension)
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Oak leaf gall - Several

Description

Several different wasp species cause galls on oak leaves.

Damage

Galls form as globular green shapes later drying and browning on leaf surfaces and twigs. Galls range from 1- 15 mm.

Cultural Controls

Rake and destroy fallen leaves.

Remarks

Treatment is not necessary. If used, apply as leaves are expanding.

Chemical Controls

Acephate
Signal Word: Caution
Pesticide Class: Organophosphate
Bifenthrin
Signal Word: Caution
Pesticide Class: Synthetic pyrethroid
Deltamethrin
Signal Word: Caution
Pesticide Class: Synthetic pyrethroid

Locations Affected

leaves, needles

Plant Environment

outdoors

Scouting Season:

April - Late , May - Early

Plants Affected


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