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*This is an excerpt from Sucking Pests of Peanuts in Alabama, ANR-0990.

Aphids have not been an economic problem on peanuts in recent years. These soft-bodied insects are often called “plant lice” and feed by sucking the juices from foliage. They may be yellow, dark green, or black in color, and are approximately 1/4 inch long with an oval shaped body. Feeding aphids secrete a sticky substance on plants called “honey dew”. A black fungus often grows on the honey dew causing the affected plants to turn black or greasy looking. Aphid feeding usually occurs in early to mid-season.

In Alabama, aphid damage to peanuts is seldom severe enough to warrant controls. Beneficial insects will usually control aphids effectively.

Read here to learn more about sucking pests of peanuts in Alabama.

 

*This is an excerpt from Sucking Pests of Peanuts in Alabama, ANR-0990.

The predominate spider mite found on Alabama peanuts is the two-spotted mite. These tiny, insect-related pests feed primarily by sucking plant juices from the underside of the leaf.

The feeding causes a yellow speckling of the leaves and the foliage to gradually turn from yellow to brown. Large populations of mites can be solely responsible for serious plant damage and defoliation. There is usually a fine webbing associated with the feeding site of the mites. The mites themselves are yellow with two black spots on the body. Immatures appear to be red or reddish-yellow. Adults lay eggs near the underside of the leaflet mid-vein. As the population increases, they begin to move to the terminals of the plant with “balls” of mites accumulating at the top of the plant.

Spider mites usually migrate from weedy field borders, utility poles, or garden areas. In the heat of summer, as these areas begin to dry up, the mites are spread by wind, equipment, or animals moving through the peanuts. Therefore, initial infestations are usually small and spotty, limited to areas 2 to 3 feet in diameter. Early infestations of spider mites may be confused with damage caused by peanut rust.

Scouts should be alert to look for symptoms of mite infestation before they spread over the field. In general, spider mites are a hot, dry weather pest with major outbreaks occurring in droughty years. Applications of certain foliar insecticides may also “trigger” outbreaks of mites if weather conditions are favorable. Most insecticides will not effectively control these pests and a true miticide must be used to obtain effective results.

Read here to learn more about sucking pests of peanuts in Alabama.

 

 

*This is an excerpt from Sucking Pests of Peanuts in Alabama, ANR-0990.

The three-cornered alfalfa hopper is about 1/4 inch long with a wedge-shaped body. Adults are green; nymphs are tan or green with spines along the top of the body. Damage is caused by adults and nymphs piercing the stems and the leaf petioles. The most visible symptom of TCAH feeding is the thickened callous tissue or girdle that encircles the stem or petiole. Other plant symptoms include a purple discoloration of the stem above the feeding site and the eventual yellowing of the affected terminal . This damage may be confused with the symptoms of some soil diseases of peanuts like Cylindrocladium black rot, Rhizoctonia limb rot or TSWV. Multiple girdles of the vertical terminals and lateral runners may severely affect the maturation of the peanut pods.

Since specific threshold levels are not established for damage or numbers of TCAH’s, control decisions are difficult. Maturity of the crop, weather conditions, and the presence of a high number of adults and nymphs are factors that have to be considered before recommending controls. Infestations of TCAH are quite variable and not predictable, but lush peanut vine growth and a wet season seem to favor higher populations of TCAH.

Read here to learn more about sucking pests of peanuts in Alabama.

 

 

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