WSU Extension

Hortsense

Raspberry
 
Disease
Anthracnose 
Boron deficiency 
Fruit rot and cane Botrytis 
Phytophthora root rot 
Powdery mildew 
Spur blight 
Yellow rust 
Insect
Aphids 
Brown marmorated stink bug 
Cutworms and armyworms 
Dryberry mite 
Leafrollers 
Loopers 
Raspberry beetle (raspberry fruitworm) 
Raspberry crown borer 
Root weevils 
Rose stem girdler 
Spider mites 
Spotted wing Drosophila (SWD) 



print version| pdf version| email url    
Caption: Raspberry spider mite damage
Photo by: A.L. Antonelli
  
Raspberry : Spider mites
(revision date: 6/8/2015)


Biology
Spider mites are tiny, eight-legged mites which may range in color from yellowish to green or red. Several species may occur on raspberries, including the twospotted spider mite. Spider mites typically feed on the underside of leaves, causing a yellowish stippling or speckling of the leaf. Severe infestations can cause entire leaves to turn yellow and drop, sometimes resulting in considerable leaf loss and reduced yield. Spider mite feeding is usually accompanied by webbing on the underside of leaves and between leaves and stems. Adults overwinter in plant debris or on canes. Mite infestations are worse in hot, dry, dusty conditions and are more common on red raspberries than on trailing berries.
Management Options


Non-Chemical Management
  • Provide proper culture. Healthy plants are more tolerant of damage, while drought-stressed plants are more susceptible.
  • Predatory mites and insects such as ladybird beetles and green lacewings aid in control of mite populations. Avoid use of broad-spectrum insecticides which kill beneficials.
  • Hose mites from plants with a strong stream of water.
  • High levels of nitrogen in the foliage encourage spider mite reproduction. Switch to a slow-release or low-nitrogen fertilizer when practical.
Select non-chemical management options as your first choice!

Chemical Management

Insecticidal soaps may require several applications. Oils and soaps must contact mites to kill them. Be sure to target the undersides of leaves. It is doubtful whether it is worthwhile to control infestations that develop after September 1.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • All Seasons Horticultural & Dormant Spray Oil Conc [Organic]
    Active ingredient: oil/pet distillate  |  EPA reg no: 4-80
  • Azamax Botanical Insecticide, Miticide, & Nematicide [Organic]
    Active ingredient: azadirachtin  |  EPA reg no: 71908-1-81268
  • Bonide Mite X RTU
    Active ingredient: clove oil, cottonseed oil, garlic oil/powder  |  EPA reg no: 4-04001
  • Safer Brand Insect Killing Soap Conc II [Organic]
    Active ingredient: potassium laurate  |  EPA reg no: 42697-60
  • This list may not include all products registered for this use.
Images

+ Show larger images

 
Caption: Raspberry spider mite damage
Photo by: A.L. Antonelli
Caption: Spider mites under microscope
Photo by: L.K. Tanigoshi
Caption: Spider mite damage on leaf
Photo by: A.L. Antonelli