Southern Corn Rootworm

Common Name: Southern Corn Root Worm, Spotted Cucumber Beetle

Genus: Diabrotica

Species: undecimpunctata

Identification: see lifecycle

Lifecycle: In contrast to the other two rootworms the Northern or Western, this insect overwinters as an adult. The head is black and it has 12 conspicuous black spots on the wing. The adults deposits between 200 to 1200 eggs around the base of the corn plant. The young larvae hatch, bore into the roots and become full grown by July when they pupate in the soil. Generally, there are two generations. The adults can live for more than 300 days.

Geographic Distribution: It is widely distributed throughout the United States, but is particularly destructive in the southern part of its range.

Damage and Treatment: In addition to injury to the roots the lower stalk will usually be bored through by the grubs. The result is a low vigor corn plant that can be blown over by winds. Rotation of crops is of little value in its control. 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.

Corn

Potatoes

Soybeans

Amaranthes Amaranthus palmeri, Amaranthus hybridus, Amaranthus spinosus

Aphids Therioaphis maculata, Dysphis plantaginea, Acyrthosiphon kondoi, Acyrthosiphon kondoi, Acyrthosiphon pisum, Aphis gossypi

Armyworm, Beet Spodoptera

Barnyardgrass Echinochloa

Black Nightshade

Cabbage Looper Trichoplusia

Colorado Potato Beetle Leptinotarsa

Common Cocklebur Xanthium

Crabgrass Digitaria sanguinalis, Digitaria ischaemum, Digitaria ciliaris

Cupgrass Eriochloa gracilis, Eriochloa villosa

Cutworms Agrotis ipsilon, Agrotis orthogonia, Peridroma saucia

Eastern Nightshade Solanum americanum, Solanum nigrum, Solanum ptycanthum, Solanum saccachoides

European Corn Borer Ostrinia

Fall Armyworm Spodoptera

Foxtail Species Setaria venticillata, Setaria faberi, Setaria viridis, Setaria glauca

Goosegrass Eleusine

Grasshopper Melanoplus sanguinipes, Camnula pellacida

Jimsonweed Datura

Johnsongrass seedling Sorghum

Kochia Kochia

Lambsquarters Chenopodium

Lygus Bug Lygus

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

Pennsylvania Smartweed Polygonum

Pigweed, Redroot Amaranthus

Prickly Sida Sida

Ragweeds Ambrosia artemisiifolia, Ambrosia trifida

Sandbur, Field Cenchrus

Shattercane Sorghum

Sicklepod Cassia

Southwestern Corn Borer Diatrea

Spider Mites Tetranychus urticae, Tetranychus turkestani, Tetranychus pacificus, Tetranychus cinnabarinus

Spotted Cucumber Beetle Diabrotica

Spurred Anoda Anoda

Stink Bug Nezara viridula, Chlorockroa say, Euschistus consperus

Tarnished Plant Bug Lygus

Tobacco Budworm Helicoverpa

Velvetleaf Abutilon

Venice Mallow Hibiscus

Western Corn Rootworm Diabrotica longicornus barberi, Diabrotica virgifera virgifera

Wild Mustard Brassica

Wild Sunflower Helianthus

Wireworms Melanotus fissilis, Limonius spp. Many species in the order Coleoptera, family Elatoridae.

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