Simple Technique for Storing Diapausing Southwestern Corn Borers (Lepidoptera: Pyralidae)1

1983 ◽  
Vol 76 (5) ◽  
pp. 1191-1192 ◽  
Author(s):  
Frank M. Davis
1991 ◽  
Vol 20 (5) ◽  
pp. 1356-1362 ◽  
Author(s):  
Thomas J. Glover ◽  
Janet J. Knodel ◽  
Paul S. Robbins ◽  
Charles J. Eckenrode ◽  
Wendell L. Roelofs

1978 ◽  
Vol 110 (12) ◽  
pp. 1351-1353 ◽  
Author(s):  
D. G. R. McLeod

AbstractGrowth rate, diapause incidence, and diapause intensity were different in two strains of corn borers found in southwestern Ontario. Crosses between these two strains demonstrated that growth rate was female sex linked while diapause incidence was male sex linked. The effect of these two characteristics on hybridization is discussed.


1981 ◽  
Vol 59 (8) ◽  
pp. 1535-1538 ◽  
Author(s):  
Barry E. Bendell ◽  
Patrick J. Weatherhead ◽  
Robin K. Stewart

Population estimates of the European corn borer (Ostrinia nubilalis Lepidoptera: Pyralidae) were significantly positively correlated with distance from a blackbird roost near Beauharnois, Quebec. Gullet contents of male red-winged blackbirds (Agelaius phoeniceus) indicated that corn borers were consumed, particularly in the late fall. This predation appears to be responsible for lowering corn borer populations in standing corn the following year. It was estimated that the benefit provided by red-winged blackbirds through predation on com borers compensated for approximately 20% of the damage the birds did to standing corn.


1979 ◽  
Vol 111 (12) ◽  
pp. 1325-1335 ◽  
Author(s):  
W. M. Elliott ◽  
V. A. Dirks

AbstractThe spermatophores in mated female European corn borers, Ostrinia nubilalis (Hübner), were shown to lose volume (depletion), change colour, and retract their spiral stalks over a period of about 7 days in such a way that postmating age could be estimated from their appearance. Colour changes and stalk retraction occurred more slowly in females that laid fertile eggs than in those that did not, but depletion occurred at the same rate. The average postmating age was estimated as 5.2, 6.3, 3.9, and 2.6 days for small light trap catches of first generation females in 1974, 1975, 1976, and 1977 and 4.4, 3.9, and 3.2 days for larger catches of second generation females in 1974, 1975, and 1977. Catches did not show decreasing numbers in successive age groups but tended to show modal values at < 1 day and at 4–6 days with only 1% living > 7 days. Redistribution of the moths from the date of capture back to the date of mating tended to give a unimodal curve of numbers on time in the 1975 second generation but not in 1974 or 1977. The unimodal curve of redistributed moths in 1975 was significantly different from a normal distribution. The redistribution showed that 58% of the moths mated within the heat unit interval when the second generation was expected to emerge, whereas only 38% of the actual catches occurred in this interval. Redistribution also showed that mating probably occurred even on cold nights when few moths were trapped, and conversely that on some warm nights with large catches most of the moths had mated on earlier nights.


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