Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Keyword
Articles 1 - 4 of 4
Full-Text Articles in Life Sciences
New Header Treatment Aids Weevil Control, J H. Moulden
New Header Treatment Aids Weevil Control, J H. Moulden
Journal of the Department of Agriculture, Western Australia, Series 4
A new insecticide formulation supplied in high pressure cylinders simplifies weevil control in headers.
Nest Architecture Of Polistine Wasps, James M. Poff
Nest Architecture Of Polistine Wasps, James M. Poff
Journal of the Minnesota Academy of Science
Wasps of the genus Polistes build two basic types of unenclosed paper nests. The mesocaulus type nest has fewer peripheral cells and comes closer to having the minimum number of total cell walls than the acrocaulus type nest. It is suggested that natural selection has favored this more economical nest form in regions with short growing seasons.
Attempts To Enrich The Parasite Fauna Of The European Corn Borer In Minnesota, H. C. Chiang, D. F. Palmer
Attempts To Enrich The Parasite Fauna Of The European Corn Borer In Minnesota, H. C. Chiang, D. F. Palmer
Journal of the Minnesota Academy of Science
Four parasitic insect species were tested in laboratory experimentation for adaptability to the European corn borer (ECB). Apanreles sesamiae, Apanteles flavipes and Chelonus knabi did not adapt to the ECB, Lixophaga diatraeae was able to survive on ECB. Three other species. Macrocentrus grandii, Eriborus terebrans and Lydella rhompsoni, all known parasites of ECB, were obtained and reared in the laboratory on ECB for propagation, release and ecological studies. Methodology for experimentation and propagation of parasites was described.
Thermal Shock Effects On Larvae Of Caddis Fly Brachycentrus Americanus, Jack A. Salmela, Richard L. Anderson
Thermal Shock Effects On Larvae Of Caddis Fly Brachycentrus Americanus, Jack A. Salmela, Richard L. Anderson
Journal of the Minnesota Academy of Science
Wild-collected Brachycentrus americanus larvae were subjected to thermal shocks of 30-minute and 60-minute duration in June, September, and December of 1976. Temperatures at collection were 14.7 , 10.4 , and 1.2 C, respectively. The TL50's for both 30-minute and 60-minute shock durations ranged from 33.3 C to 34.0 C for each month, except for a 30-minute exposure in September, which had a TL 50 of 34.6 C. Larvae from a December exposure were held for 16 days to observe postexposure behavior. Feeding was reduced 50 percent among specimens exposed to temperatures 1.2 C below the 30-minute TL 50 and 3.6 …