Spider Mites

Common Name: Twospotted spider mite, Strawberry spider mite, Pacific spider mite, Carmine spider mite

Genus: Tetranychus urticae, Tetranychus turkestani, Tetranychus pacificus, Tetranychus cinnabarinus

Identification: Webspinning spider mites are very small, measuring no more than 1/50 inch. Adults have 8 legs and are oval body, usually with two red eyespots near head.

Lifecycle: The mite overwinters as adults. Rapid reproduction leads to several generations per year. Spider mites live in colonies, mostly on the undersides of leaves, and produce a webbing that can cover much of the underside of the leaves.

Geographic Distribution: Found throughout the entire United States.

Damage and Treatment: These mites live on the sap of the plant. They are found on the undersurface of the leaves and in severe cases a web can be formed over the entire plant. Leaves can turn yellow or red and drop off, reducing energy available to maturing plants. Treatment should be made when insect populations and/or damage levels reach economic thresholds. Refer to local University Extension Pest Management Guidelines for specific state thresholds.

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Crops affected by Spider Mites

Almonds
Cavalo Broccolo
Chinese Broccoli
Corn
Cotton
Currant
Dry Shelled Beans and Peas
Gooseberry
Soybeans
Succulent Peas & Beans

Additional Pests

Alfalfa Looper
Amaranthes
Amaranthus palmeri, Amaranthus hybridus, Amaranthus spinosus
Aphids
Therioaphis maculata, Dysphis plantaginea, Acyrthosiphon kondoi, Acyrthosiphon kondoi, Acyrthosiphon pisum, Aphis gossypi
Armyworm, Beet
Spodoptera
Armyworms
Barnyardgrass
Echinochloa
Bermudagrass
Bittercress
Black Nightshade
Bluegrass, Annual
Boll Weevil
Anthonomus
Broadleaf Filaree
Broadleaf Signalgrass
Cabbage Looper
Trichoplusia
Cabbage Webworm
Carpetweed
Codling Moth
Cydia
Colorado Potato Beetle
Leptinotarsa
Common Cocklebur
Xanthium
Common Ragweed
Corn Borers
Corn Earworm
Corn Rootworm
Crabgrass
Digitaria sanguinalis, Digitaria ischaemum, Digitaria ciliaris
Cupgrass
Eriochloa gracilis, Eriochloa villosa
Cutworms
Agrotis ipsilon, Agrotis orthogonia, Peridroma saucia
Dallisgrass
Dandelion
Diamondback Moth
Eastern Nightshade
Solanum americanum, Solanum nigrum, Solanum ptycanthum, Solanum saccachoides
European Corn Borer
Ostrinia
Fall Armyworm
Spodoptera
Field Pennycress
Flea Beetles
Florida Pusley
Foxtail Species
Setaria venticillata, Setaria faberi, Setaria viridis, Setaria glauca
Giant Ragweed
Goosegrass
Eleusine
Grasshopper
Melanoplus sanguinipes, Camnula pellacida
Hornworms
Jimsonweed
Datura
Johnsongrass seedling
Sorghum
Kochia
Kochia
Lambsquarters
Chenopodium
Leafhoppers
Leafroller
Archips rosanus, Archips argyrospila, Argyrotaenia velutinana, Choristorenra rosaceana
Lygus Bug
Lygus
Morningglory
Nightshades
Solanum americanum, Solanum nigrum, Solanum ptycanthum, Solanum saccachoides
Northern Corn Rootworm
Diabrotica longicornus barberi, Diabrotica virgifera virgifera
Nutsedges
Cyperus rotundus, Cyperus esculentus
Panicum, Fall
Panicum
Panicum, Texas
Panicum
Pea Aphid
Pennsylvania Smartweed
Polygonum
Perennial Ryegrass
Pigweed, Redroot
Amaranthus
Pink Bollworm
Pectinophora
Plant Bugs
Prickly Sida
Sida
Purslane
Quackgrass
Ragweeds
Ambrosia artemisiifolia, Ambrosia trifida
Sandbur, Field
Cenchrus
Shattercane
Sorghum
Sicklepod
Cassia
Southern Corn Rootworm
Diabrotica
Southwestern Corn Borer
Diatrea
Spotted Cucumber Beetle
Diabrotica
Sprangletop
Spurge
Spurred Anoda
Anoda
Stink Bug
Nezara viridula, Chlorockroa say, Euschistus consperus
Tarnished Plant Bug
Lygus
Thrips
Tobacco Budworm
Helicoverpa
Two-spotted Spider Mite
Velvetbean Caterpillar
Velvetleaf
Abutilon
Venice Mallow
Hibiscus
Western Corn Rootworm
Diabrotica longicornus barberi, Diabrotica virgifera virgifera
Whiteflies
Wild Mustard
Brassica
Wild Sunflower
Helianthus
Wireworms
Melanotus fissilis, Limonius spp. Many species in the order Coleoptera, family Elatoridae.
Yellow Nutsedge
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