A Biotype of the Spotted Alfalfa Aphid on Alfalfa

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Abstract
In February 1958, near El Centro, California, symptoms of susceptibility to the spotted alfalfa aphid (Therioaphis maculate (Buckton)) were observed in the previously resistant alfalfa clone N(evada)-1018. A series of tests from March to October demonstrated that a biotype, designated ENT A, was capable of surviving and reproducing on three of the eight parent clones of the aphid-resistant nondormant variety Moapa. The new biotype did not show a similar reaction to five other Moapa parent clones tested or to any of the five parent clones of Lahontan, a variety also resistant to this aphid. Comparisons were made with a standard working culture of the aphid, designated ENT B, originated and maintained at Bakersfield, California. In a cage test of Moapa as a variety grown from breeder seed, biotype ENT A produced much higher populations but plant mortality was not increased. Little damage to Moapa should occur unless or until biotype ENT A becomes dominant in the aphid population of an area. Even so, populations on Moapa can be expected to be much lower than those that develop on susceptible varieties

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