Browsing by Subject "Boll weevil"
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Item Boll weevil immigration into winter habitat and subsequent spring and summer emergence(Texas Tech University, 1978-05) Wade, Larry J.Not availableItem Emergence profile of overwintered boll weevils and entry into cotton(Texas Tech University, 1978-05) White, James RoyNot availableItem Induction of apoptosis by an insect iridescent virus in boll weevil and budworm cell culture(Texas Tech University, 1999-08) Jayaraman, RajeswariThe cotton boll weevil, Anthonomus grandis, is a major pest of cotton, causing up to $100 million in damage to the American cotton farmer. Our laboratory has found that an insect virus (boll weevil pathogenic virus, BWPV) replicates efficiently in boll weevil larvae and a protein extract from purified virus particles induces apoptosis in cell culture. The phenomenon was confirmed in budworm (CF) and boll weevil (AG) cells by observing characteristic apoptotic cytopathology (blebbing) and DNA fragmentation. In addition, a number of differential sensitivity assays were also carried out to determine the dose required to induce blebbing and DNA fragmentation. The tissue culture toxicity dose assay (an equivalent of the LD50 assay) showed that 6.3 ng/ml is sufficient to induce apoptotic blebbing in CF cells, and 54.1 ng/ml of the virion extract is required for AG cells. Further, the minimum dose required to induce DNA fragmentation was found to be 2ug/ml. The above data will have significance for the mechanism of viral induction of apoptosis and for the use of viral genes in the generation of insect-resistant plants.Item Selected effects of diapause boll weevil control programs on two non-target insects(Texas Tech University, 1968-06) Hills, Thomas MNot availableItem The spread and establishment of the cotton boll weevil in the Texas High Plains(Texas Tech University, 1997-12) Bodden, Elizabeth AnnFor over 100 years the boll weevil, Anthonomus grandis Boheman, has been extensively studied in attempts to halt its destmction. In spite of all this effort, the boll weevil continues to be responsible for extensive losses and socio-economic changes in the cotton belt of the United States. The Texas High Plains has been threatened by the boll weevil for over 40 years. The High Plains or Texas High Plains is defined as the area of northwest Texas bounded on the east by the Rolling Plains and to the south by the Edwards Plateau and the Trans Pecos area. This area is the largest cotton producing region in the state of Texas and one of the finest in the nation (Bottrell et al. 1972). Until recently, a diapause control program initiated in 1964 has kept the boll weevil from establishing itself as an economic pest in the Texas High Plains (Leser et al. 1996). Since 1993, the boll weevil has become a more wide spread problem in the Texas High Plains. This study documents the spread and establishment of the boll weevil in the Texas High Plains. This study also addresses some questions pertaining to the overwintering success and the importance of late season trap collected boll weevils to the overall overwintering population. Documenting this latest boll weevil incursion and understanding the underlying causes and limitations for population establishment may provide the insight necessary for Texas High Plains producers to continue to grow cotton in spite of this threat. Will the cotton industry of the Texas High Plains withstand the onslaught of the boll weevil or fade into obscurity like that of the old south?