frosts, root rot, sawfly, leaf scorch, frost heaving, sclerotinia, defoliation, drouth, wireworms, johnsongrass, droughty, anthracnose, armyworms, hessian fly, chlorosis, overwintering, cutworm, chinch bug, sunscald, stem canker, spider mite, downy mildew, late blight, desiccation, flea beetle, dieback, tillering, fusarium, blister rust, tasseling, phytophthora, phoma, frogeye, lygus, powdery mildew, bollworm, hairy vetch, clubroot, forbs, webworms, rainbow smelt, inoculum, corn earworm, pigweed, shelterbelts, wild parsnip, budworm, horseweed, corn borer, aphid, prussic acid, rains, flooding, ryegrass, smartweed, woolly adelgid, forage, pythium, tillage, foxtail barley, soil erosion, precipitation, fall armyworm, infestations, leafy spurge, hogweed, reed canary grass, nutsedge, hydrilla, ragweed, forest tent caterpillar, redpolls, fall webworm, bunchgrass, cold snap, tobacco budworm, rust fungus, perennial ryegrass, leafminer, chiggers, harvests, rainfall, vetch, spartina, cotton bollworm, kochia, mildews, knapweed, overgrazed, edible bean, italian ryegrass, sericea lespedeza, cercospora, fungicides, leafhoppers, whitefly, phalaris, crops, european corn borer, blackfly, salinity, overwinter