WSU Extension

Hortsense

Azalea
 
Disease
Botrytis petal blight 
Cylindrocladium blight & root rot 
Leaf and flower gall 
Leaf spot 
Lime-induced chlorosis 
Marginal leaf necrosis 
Nematode (stunt) 
Ovulinia petal blight 
Powdery mildew 
Root rot (Phytophthora) 
Insect
Azalea bark scale 
Azalea lace bug 
Azalea leafminer 
Obliquebanded leafroller 
Root weevils 
Spider mites 



print version| pdf version| email url    
Caption: Azalea leafroller larval damage on flowers
Photo by: A.L. Antonelli
  
Azalea : Obliquebanded leafroller
(revision date: 3/10/2017)


Biology
Obliquebanded leafrollers are usually found on the new growth. Their presence can be determined by rolled leaves held in place with webbing. The smooth green caterpillars, about 3/4" long, can be found feeding inside the rolled leaves. The adult is an orange-brown moth approximately 1/2" long and bell shaped from above when at rest.
Management Options


Non-Chemical Management
  • Naturally-occurring parasites and predators including birds and predaceous ground beetles will help control leafroller populations.
  • Pinch leaves to kill individual leafrollers.
Select non-chemical management options as your first choice!

Chemical Management

Apply when larvae are present and feeding. Sevin (carbaryl) is particularly dangerous to honeybees since it does not immediately kill them. They return to the hive with the poison and distribute it within. Therefore avoid carbaryl if at all possible if there is a chance of pesticide drifting onto nearby blooming plants. Bacillus thuringiensis (Bt) will control leafrollers only if they are actively feeding. Use a spreader-sticker with liquid Bt formulations.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Bonide Systemic Insect Control
    Active ingredient: acephate  |  EPA reg no: 239-2461-4
  • ferti-lome Dipel Dust
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 7401-290
  • GardenTech Sevin Conc Bug Killer
    Active ingredient: carbaryl  |  EPA reg no: 264-334-71004
  • Safer Brand Caterpillar Killer for Trees, Shrubs & Vegetables Conc II [Organic]
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 70051-106-42697
  • Safer Brand Caterpillar Killer/Trees, Shrubs, & Vegetables Conc
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 42697-23
  • This list may not include all products registered for this use.
Images

+ Show larger images

 
Caption: Azalea leafroller larval damage on flowers
Photo by: A.L. Antonelli
Caption: Obliquebanded leafroller adult
Photo by: J.F. Brunner