Abstract
Damaging population levels of a white grub, Phyllophaga crinita (Burmeister), annually infest ca. 40,000 acres of grain sorghum and wheat in a 7 county area in the Texas Southern High Plains. Based on weekly sampling, larvae were present in the field throughout the year and was the only stage present during all months except May, June, and July. Pupae were most abundant in mid-June and the subsequent adults were most prevalent in early July. The egg stage was most abundant ca. 1–2 wk following peak adult abundance. Adult activity was recorded by light trap collections and was greatest during late June and July which corresponded to the peak abundance of adults collected in the field.
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