Yellow clover aphid on alfalfa: Pest not ruinous to state's alfalfa industry but production costs increased by frequent field inspections and treatments
California Agriculture 9(7):4-15.
Published July 01, 1955
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By mid-May 1955 the populations of the yellow clover aphid—Therioaphis trifolii (Monell)—in alfalfa fields in the desert areas of California had dropped off to such an extent that many fields did not require treatment.