| verification of a european corn borer (lepidoptera: crambidae) loss equation in the major corn production region of the northeastern united states. | field studies in pennsylvania and maryland were conducted during 2000, 2001, and 2002 to test the applicability of published yield loss relationships developed in central pennsylvania for european corn borer, ostrinia nubilalis (hübner), management in warmer, longer season corn, zea mays l., grain production regions of the northeastern united states. both isoline hybrids and non-bt lead hybrids were compared against bacillus thuringiensis (bt) hybrids to measure effects of the pest on yield. the ... | 2005 | 15765671 |
| feeding behavior of larval black flies (diptera: simuliidae) with and without exposure to bacillus thuringiensis var. israelensis. | behavioral time budgets were constructed for larval black flies of the simulium jenningsi and s. tuberosum groups in a recirculating flume. larvae spent the majority (54-80%) of time filter feeding. flick rates of the labral fans, which averaged 0.7-1.9 flicks/sec, did not differ significantly between regimens of 0 mg/l and 10 mg/l of food. larvae consistently flicked the fan nearest the water surface significantly more often than the lower fan. they also tended to flick the right fan more than ... | 2006 | 16859093 |
| corn earworm (lepidoptera: noctuidae) in northeastern field corn: infestation levels and the value of transgenic hybrids. | corn earworm, helicoverpa zea (boddie), is a polyphagous noctuid pest of agricultural crops across the united states that is gaining attention as a pest of field corn. before the introduction of transgenic insect-resistant hybrids, this pest was largely ignored in field corn, but now many bacillus thuringiensis (bt) corn hybrids have activity against corn earworm. however, the value of control in the northeastern united states is unclear because the risk posed by corn earworm to field corn has n ... | 2013 | 23865190 |
| the effect of seston on mortality of simulium vittatum (diptera: simuliidae) from insecticidal proteins produced by bacillus thuringiensis subsp. israelensis. | water was collected from a site on the susquehanna river in eastern pennsylvania, where less-than-optimal black fly larval mortality had been occasionally observed after treatment with bacillus thuringiensis subsp. israelensis de barjac insecticidal crystalline proteins (bti icps). a series of experiments was conducted with simulium vittatum zetterstedt larvae to determine the water related factors responsible for the impaired response to bti icps (vectobac 12s, strain am 65-52). seston in the w ... | 2011 | 22217757 |