WSU Extension

Hortsense

Apple
 
Disease
Anthracnose and Bull's-eye rot 
Bitter pit 
Burrknot 
Crown and collar rot 
Crown gall 
Cytospora canker 
Fire blight 
Fruit russeting 
Nectria canker (European canker) 
Nectria twig blight (Coral spot) 
Perennial canker (Bull's-eye rot) 
Phytophthora fruit rot 
Powdery mildew 
Scab 
Virus diseases 
Insect
Aphids 
Apple ermine moth 
Apple maggot 
Apple-and-thorn skeletonizer 
Brown marmorated stink bug 
Codling moth 
Cutworms and armyworms 
Earwigs 
Fruittree leafroller 
Leafhoppers 
Leafrollers 
Lecanium scale 
San Jose scale 
Spider mites 
Tent caterpillars 
Tentiform leafminer 



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Caption: Apple tentiform leafminer damage
Photo by: J.F. Brunner
  
Apple : Tentiform leafminer
(revision date: 5/20/2014)


Biology
This small caterpillar larva mines the leaves of apple (primary host) and sometimes cherry, prune and pear. High populations in late summer can reduce fruit size in certain varieties. Parasites usually keep numbers down below damaging levels. Most years yield three complete generations and sometimes a partial fourth. They overwinter as pupae in fallen leaves.
Management Options


Non-Chemical Management
  • Pinching mines when first seen (on dwarf varieties) can help suppress later generations.
  • If mines average 2 or fewer per leaf - expect no serious impact to tree or fruit production.
  • Rake fallen leaves and dispose of them in the trash. Do not compost or bury leaf debris from infested trees.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Apple tentiform leafminer damage
Photo by: J.F. Brunner