Johnsongrass seedling

Common Name: Johnsongrass

Genus: Sorghum

Species: halepense

Identification: Vigorous perennial plant that spreads by seed or by creeping, robust fleshy rhizomes. Plants form hydrocyanic acid when under frost or moisture stress, making the plant toxic to livestock. Both the leaves and the leaf sheath of the seedling are smooth. The plant has no ligules and with its solid stem, Johnsongrass can grow 2-8 feet tall. It has reddish-purple spikelets, as well as awns that are bent and needle-like.

Geographic Distribution: Can be found from Massachussets to Iowa, south to Florida and Texas to southern California. Commonly found in roadsides, ditches and cultivated fields.

Soybeans

Amaranthes Amaranthus palmeri, Amaranthus hybridus, Amaranthus spinosus

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

Barnyardgrass Echinochloa

Black Nightshade

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

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

Southern Corn Rootworm Diabrotica

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

Spurred Anoda Anoda

Stink Bug Nezara viridula, Chlorockroa say, Euschistus consperus

Tobacco Budworm Helicoverpa

Velvetleaf Abutilon

Venice Mallow Hibiscus

Wild Mustard Brassica

Wild Sunflower Helianthus

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