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Corn seed-Mite Includes Banks grass mite (Oligonychus pratensis) Twospotted spider mite (Tetranychus urticae) Pest description and crop damage Tiny, spiderlike animals, on underside of leaves, that cause yellowing or silvering of leaves. They feed on plan ...

Corn seed-Western bean cutworm Striacosta albicosta Pest description and crop damage Large brown caterpillars that feed on foliage and burrow into ears. Female moths lay egg masses on corn foliage. The caterpillars will move from plant to plant, and indiv ...

Corn seed-Wireworm Ctenicera spp. and Limonius spp. Pest description and crop damage Slender shiny brown to yellow grubs with hard bodies. Wireworms are the larvae of click beetles. Wireworms live in the soil where they may feed on corn seeds or the roots ...

Lettuce seed-Aphid Includes Green peach aphid (Myzus persicae) Lettuce aphid (Nasonovia ribis-nigri) Pest description and crop damage Small yellowish, soft-body insect. Aphids suck plant sap from foliage causing a yellowing or wilting of the plant and sti ...

Lettuce seed-Armyworm and looper Includes Armyworms Armyworm (Pseudaletia unipuncta) Beet armyworm (Spodoptera exigua) Loopers Alfalfa looper (Autographa californica) Cabbage looper (Trichoplusia ni) Pest description and crop damage Armyworm eggs are dist ...

Lettuce seed-Slug Includes Gray field slug (Deroceras reticulatum) Greenhouse slug (Milax gagates) Marsh slug (Deroceras laeve) Red slug (Arion spp.) Reticulated slug (Prophysaon andersoni) Spotted garden slug (Limax maximus) Pest description and crop dam ...

Lettuce seed-Wireworm Limonius spp. Pest description and crop damage Wireworms are the soil-dwelling larvae of click beetles. Adult click beetles are slender, and tan to nearly black. Larvae are hard, segmented, and dark yellow or brown. Wireworms injure ...

Lettuce seed-Lygus bug Includes Western tarnished plant bug (Lygus hesperus) Pale legume bug (Lygus elisus) Pest description and crop damage Lygus bugs are Hemipteran insects with characteristic piercing-sucking mouthparts. Adults are about 0.25 inch in l ...

Onion seed-Maggot Includes Bean seed maggot (Delia florilega) Onion maggot (Delia antiqua) Seedcorn maggot (Delia platura) Pest description and crop damage Adult is a fly with a gray body and black legs, less than 0.25 inch long. Larvae are legless, blunt ...

Onion seed-Armyworm and cutworm Beet armyworm (Spodoptera exigua) Bertha armyworm (Mamestra configurata) Western yellowstriped armyworm (Spodoptera praefica) Black cutworm (Agrotis ipsilon) Variegated cutworm (Peridroma saucia) Pest description and crop d ...