Southwestern Corn Borer

Common Name: Southwestern Corn Borer

Genus: Diatrea

Species: grandiosella

Identification: see lifecycle

Lifecycle: The winter is passed as full grown larvae stage located mostly in thetap roots of old cornstalks. When feeding, the 1-inch long larvae areconspicuously spotted with 8 dark spots. The insect is found in thelower part of the stalk. In early spring the overwintering larvaepupate inside the stalk and the nocturnal adult emerges a few dayslater. The female lays 300 to 400 eggs on the underside of leaves. Theworms hatching from these eggs feed on the leaves for a short timebefore boring into the stem. The first-generation worms become fullgrown by midsummer. The second generation reach maturity in the earlyfall and may remain as larvae during the winter. There are 1 to 3generations per year.

Geographic Distribution: Limited to the southern states.

Damage and Treatment: This is a very destructive insect. The worms enter the stalk and moveup and down the pith. The result is a twisted, stunted plant showingmany holes along the leaves which have been eaten out while stillcurled in the heart of the plant. Treatment should be made when insect populations and/or damagelevels reach economic thresholds. Refer to local University ExtensionPest Management Guidelines for specific state thresholds.

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Crops affected by Southwestern Corn Borer

Additional Pests

Amaranthes
Amaranthus palmeri, Amaranthus hybridus, Amaranthus spinosus
Aphids
Therioaphis maculata, Dysphis plantaginea, Acyrthosiphon kondoi, Acyrthosiphon kondoi, Acyrthosiphon pisum, Aphis gossypi
Armyworm, Beet
Spodoptera
Armyworms
Billbugs
Black Cutworm
Black Nightshade
Chinch Bug
Common Cocklebur
Xanthium
Corn Earworm
Corn Rootworm
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
Jimsonweed
Datura
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
Seedcorn Beetle
Seedcorn Maggot
Sod Webworm
Southern Corn Leaf Beetle
Southern Corn Rootworm
Diabrotica
Spider Mites
Tetranychus urticae, Tetranychus turkestani, Tetranychus pacificus, Tetranychus cinnabarinus
Spotted Cucumber Beetle
Diabrotica
Spurred Anoda
Anoda
Stalk Borer
Stink Bug
Nezara viridula, Chlorockroa say, Euschistus consperus
Thrips
Tobacco Budworm
Helicoverpa
Velvetleaf
Abutilon
Venice Mallow
Hibiscus
Waterhemp
Western Corn Rootworm
Diabrotica longicornus barberi, Diabrotica virgifera virgifera
White Grub
Wild Mustard
Brassica
Wild Sunflower
Helianthus
Wireworms
Melanotus fissilis, Limonius spp. Many species in the order Coleoptera, family Elatoridae.
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