Effects on development of immature Mexican corn rootworm (Coleoptera : Chrysomelidae)

Development of immature Mexican corn rootworm, Diabrotica virgifera zeae Kr ysan & Smith, was investigated at 8 temperatures ranging from 15 to 33 degr ees C. Development to adult was only completed in the range from 15 to 30 d egrees C; larvae failed to complete the 3rd instar at 31.5 and 33 degrees C . Development from hatch to adult emergence was fastest at 30 degrees C (ap proximate to 25 d), and slowest at 15 degrees C (approximate to 105 d). Dev elopmental times, from hatch to adult emergence, differed for males and fem ales, males emerged before females. A pooled thermal threshold of 10.3 degr ees C was estimated for immature development. Development from hatch to adu lt emergence was estimated to take 473 DD.