Spotted Cucumber Beetle

Common Name: Southern Corn Root Worm, Spotted Cucumber Beetle

Genus: Diabrotica

Species: undecimpunctata

Identification: The head is black and it has 12 conspicuous black spots on the wing.

Lifecycle: In contrast to the other two rootworms the Northern or Western, this insect overwinters as an adult. 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

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

Cutworms Agrotis ipsilon, Agrotis orthogonia, Peridroma saucia

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

European Corn Borer Ostrinia

Fall Armyworm Spodoptera

Grasshopper Melanoplus sanguinipes, Camnula pellacida

Kochia Kochia

Lambsquarters Chenopodium

Nightshades Solanum americanum, Solanum nigrum, Solanum ptycanthum, Solanum saccachoides

Northern Corn Rootworm Diabrotica longicornus barberi, Diabrotica virgifera virgifera

Pennsylvania Smartweed Polygonum

Pigweed, Redroot Amaranthus

Prickly Sida Sida

Ragweeds Ambrosia artemisiifolia, Ambrosia trifida

Southern Corn Rootworm Diabrotica

Southwestern Corn Borer Diatrea

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

Tarnished Plant Bug Lygus

Tobacco Budworm Helicoverpa

Velvetleaf Abutilon

Western Corn Rootworm Diabrotica longicornus barberi, Diabrotica virgifera virgifera

Wild Sunflower Helianthus

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

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