Spider Mites

Pest: Spider mites (Tetranychidae)

Pest Type: Insect Pest, mites

Major Identifying Features: Mites look like tiny, moving dots that can be easily observed with a 10x hand lens, females are larger than males and less than 1/20 inch, mites live in colonies on the undersurfaces of leaves, a colony can contain hundreds of single mites, some mites produce webbing (spider mites, webspinning mites), adults have 8 legs, oval bodies with two eyes on the end, new larvae only have 6 legs, eggs are spherical and translucent

Life Cycle: Reproduce rapidly in hot weather, one generation can be completed in less than a week

Pest Rating: Minor to moderate

Management Rating: Easy to moderate

Host/Season/Outbreak Information: Outbreak is almost all year in certain areas of California, they feed and reproduce on green plants throughout the winter, mites can overwinter, they lay eggs and feed in warm weather in spring, water stressed plants are susceptible hosts

Damage Information: Mites suck cell contents from leaves, a high population can damage herbaceous plants, leaves show stippling or bronze color, leaves can turn yellow to red and drop prematurely, damage might impact next year’s crop

Management Options: Biological control: Mites have many natural enemies which limit their numbers including western predatory mites Galendromus occidentalis, Phytoseiulus, sixspotted thrips, spider mite destroyer lady beetle, minute pirate bugs, bigeyed bugs, lacewing larvae, western flower thrips, cultural control by applying water to pathways and other dusty areas, proper irrigation, midseason washing of trees and vines with water, insecticidal soap, chemical control with insecticides can make the problem worse

Sources:

http://www.ipm.ucanr.edu

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s