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.

Almonds

Cavalo Broccolo

Chinese Broccoli

Corn

Cotton

Currant

Dry Shelled Beans and Peas

Gooseberry

Soybeans

Succulent Peas & Beans

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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