The spotted alfalfa aphid (yellow clover aphid on alfalfa)
AuthorsR. C. Dickson
Edward F. Laird
George R. Pesho
Authors AffiliationsR. C. Dickson was Associate Entomologist in the Citrus Experiment Station, Riverside; Edward F. Laird, Jr. was Senior Laboratory Technician, Department of Entomology in the Citrus Experiment Station, Riverside; George R. Pesho was Formerly Senior Laboratory Technician, Department of Entomology in the Citrus Experiment Station, Riverside.
Hilgardia 24(5):93-118. DOI:10.3733/hilg.v24n05p093. November 1955.
The spotted alfalfa aphid, Therioaphis maculata (Buckton), has become the most serious pest of alfalfa in many parts of southwestern United States since its discovery in New Mexico early in 1954.
Chiefly a pest of alfalfa, this insect also infests bur clover and sour clover. It does not live on red clover, Ladino clover, or sweetclover.
This insect damages alfalfa by ruining hay crops, by slowing regrowth, by thinning stands, and by killing seedling fields.
Spotted alfalfa aphid populations and resultant damage have been highest on the desert in the late fall, spring, and early summer. In cooler sections this aphid has done damage only in the summer and early fall.
The use of insecticides to control the spotted alfalfa aphid has not prevented ladybird beetles from doing a good job on this aphid when conditions were right, usually when the weather was warm.
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