Wd. Woodson et Mm. Ellsbury, LOW-TEMPERATURE EFFECTS ON HATCH OF NORTHERN CORN-ROOTWORM EGGS (COLEOPTERA, CHRYSOMELIDAE), Journal of the Kansas Entomological Society, 67(1), 1994, pp. 102-106
This study determined the survival of northern corn rootworm eggs expo
sed to different experimental low temperatures for up to 16 weeks. Egg
s were obtained from adults collected in maize fields that had been in
continuous maize for greater-than-or-equal-to 2 years. Eggs were plac
ed in the field in September to simulate soil temperatures experienced
by feral eggs. In November they were brought into the laboratory and
subjected to temperatures of 0, -2.5, -5, -7.5, or -10-degrees-C for 2
to 16 weeks. Percent egg hatch following treatment declined as temper
ature decreased and as duration of exposure at reduced temperature inc
reased. This relationship was described by the equation HATCH = 42.70
- 5.51.TP + 5.67TM -0.54*(TP)2 - 0.26*(TM)2 + 0.42*TP*TM (r2 = 0.70),
where TP and TM denote exposure temperature (C) and temperature durat
ion (weeks), respectively.