Abstract
Six biotypes of Therioaphis maculata (Buckton) have now been recognized in western United States. Among these, four are recent discoveries and were identified from results of a combination of studies including tests on the parent clones of ‘Moapa’ and ‘Washoe’ alfalfa, Medicago saliva L., biological activity, and response to sonic organophosphate insecticides. The new biotypes have been designated ENT-C, ENT-D, ENT-E, and ENT-F.
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