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UC IPM Home > Home, Gardens, Landscapes, and Turf > Environmental Disorders
How to Manage Pests
Pests in Gardens and Landscapes
Leaf scorch
Leaf scorch causes leaves to become brown around the edges and sometimes between the veins. Leaf scorch is caused by a variety of environmental factors and salt burn or mineral toxicity that restrict
the movement of water to the leaves. Dry, brown, dead leaf margins are often caused by twohorned oak gall
wasps, Dryocosmus dubiosus, infesting leaf undersides. Portions of the leaf die back beyond where
tiny galls occur on the underside of leaves, usually along a vein. Mature galls may drop, leaving only
dead leaf margins with no obvious cause. Twohorned oak gall wasps pupating in litter and soil under trees
are attacked by parasites and fungi. Groundcover, irrigation, and rainfall apparently affect the abundance
of this gall wasp and its natural enemies. The gall apparently does not harm the oaks, populations vary
naturally from year to year
Solutions
No control is recommended. Keep plants irrigated deeply and thoroughly. | 
Leaf
scorch
Galls caused by twohorned oak gall wasp
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