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Full-Text Articles in Life Sciences
Seasonal Population Fluctuations And Natural Control Of The Sweetclover Aphid, G. R. Manglitz, R. E. Hill
Seasonal Population Fluctuations And Natural Control Of The Sweetclover Aphid, G. R. Manglitz, R. E. Hill
Historical Research Bulletins of the Nebraska Agricultural Experiment Station
Because the potential of the sweetclover aphid for damaging sweetclover is well documented, yet damage occurs only occasionally under field conditions, it would appear that natural factors which depress midsummer populations are important in preventing greater damage and worthy of detailed study. Thus, this study was begun early in 1959 to investigate the natural factors which generally keep populations of this aphid below levels causing economic damage.
Effects Of Ddt And Other Insecticides On Several Species Of Potato Insects, Roscoe E. Hill
Effects Of Ddt And Other Insecticides On Several Species Of Potato Insects, Roscoe E. Hill
Historical Research Bulletins of the Nebraska Agricultural Experiment Station
Field and laboratory tests conducted in Nebraska showed DDT to be more effective than any other material yet tested against potato insect pests. Records were obtained on tuber flea beetles, Epitrix tuberis, potato psyllids, Paratrioza cockerelli, potato leafhoppers, Empoasca fabae, green peach aphids, Myzus persicae, Lygus elisus, Chlamydatus associatus, Aceratagallia uhleri and Macrosteles divisus. DDT remained effective against potato psyllids and potato leafhoppers under field conditions for a relatively long period of time. Populations of certain beneficial insects, such as Nabis spp., Orius spp. and lady beetles were found to be significantly reduced …