caa a22 4500 397570635 CHVBK 20180308164840.0 cr unu---uuuuu 161202e19961201xx s 000 0 eng 10.1093/ee/25.6.1438 doi (NATIONALLICENCE)oxford-10.1093/ee/25.6.1438 Helicoverpa zea (Lepidoptera: Noctuidae): Larval Location, Mortality, and Leaf Area Consumption on Bacillus thuringiensis-Treated Cotton [Elektronische Daten] [J. L. Jyoti, S. Y. Young, D. T. Johnson, R. W. McNew] A commercial formulation of Bacillus thuringiensis variety kurstaki Berliner (Javelin) was evaluated 2 d after application at 0.02.5,0.1, and 0..5 kg/ha to cotton leaves and terminals for its effect on location, mortality, and leaf area consumption of exposed bollworm, Helicocerpa zea (Boddie), larvae. On leaves held in paper cups the percentage of larvae in the control was typically higher on the lower than upper surface, and results were similar at all B. thuringiensis rates and times. Increasing the B. thuringiensis rate also significantly decreased leaf area consumption, which was correlated inversely with larval mortality. Application of B. thuringiensis to cotton terminals resulted in a decrease in the percentage of live larvae located on meristematic tissue and squares at all sampling times (3, 6, 12, 24, and 48 h) and an increase in the percentage on the holding cup surface and the terminal leaves. except at 48 h. The percentage of live larvae on the meristematic tissues and squares at the 2 highest B. thuringiensis rates after 6 h had been reduced 36 and 50% and 73 and 64%, respectively. from the control. These results show that within hours of B. thuringiensis application to cotton terminals there is a significant shift in the location of H. zea larvae away from meristematic tissue and squares to expended leaves or off the terminal, or both. This suggests that adequate B. thuringiensis consumption causes larval movement to locations where larvae are less damaging. © 1996 Entomological Society of America Biological Control nationallicence Bacillus thuringiensis nationallicence bollworm nationallicence cotton nationallicence Jyoti J. L. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut Young S. Y. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut Johnson D. T. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut McNew R. W. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut Environmental Entomology Oxford University Press 25/6(1996-12-01), 1438-1443 0046-225X 25:6<1438 1996 25 ee https://doi.org/10.1093/ee/25.6.1438 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.6.1438 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jyoti J. L. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut NATIONALLICENCE 700 1- Young S. Y. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut NATIONALLICENCE 700 1- Johnson D. T. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut NATIONALLICENCE 700 1- McNew R. W. Department of Entomology and Agricultural Statistics Laboratory, University of Arkansas, Fayetteville, AR 72701 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/6(1996-12-01), 1438-1443 0046-225X 25:6<1438 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford