Abstract
In Central California, Eurygaster amerinda Bliven and E. minidoka Bliven occur in open woodlands in the foothill area, and feed principally on wild oats. Under certain conditions, they shift to other host plants ( Amsinckia, Ranunculus , and Lolium ). Both species have one generation per year, with a developmental period of 70 to 90 days; from June or July until March or April they are in adult diapause. In the Berkeley Hills, the habitat of E. amerinda is relatively undisturbed, with dormancy shelter sites and feeding areas so close together that migratory movement is insignificant. In Pacheco Pass, the grasslands in the vicinity of the dormancy sites are grazed early in February and March, and at the time of emergence in April the bugs fly to lower rangelands. The adaptation of E. amerinda and E. minidoka to the wild oat, an introduced grain, shows that they have the adaptive ability to become pests of cultivated cereals in the United States.
Published Version
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