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United States Department of Agriculture

Agricultural Research Service

Title: Artificial Pink Bollworm Egg Infestations and Larval Survival in Nucotn 33b and Deltapine Cotton Cultivars in Arizona

item Henneberry, Thomas
item Brown, Sarah
item Hill, Jennifer - PREVIOUS USDA-ARS EMP.

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: May 1, 2000
Publication Date: June 1, 2000

Technical Abstract: NuCOTN 33b (Bt cotton) (Monsanto Company, St Louis, MO) carrying the gene for the Bacillus thuringiensis var. kurstaki (Berliner) insect toxic protein is a new advance in technology for pink bollworm (PBW), Pectinophora gossypiella (Saunders), control. To investigate grower concern for reduced efficacy in late-season because of breakdown or non- expression of the toxic protein, we compared the susceptibility of Bt and Deltapine 5415 (Monsanto Company, St Louis, MO) (non-Bt) cotton bolls to PBW at periodic intervals during the first and second cotton fruiting cycles. We placed >200 PBW eggs per boll on the inside surface of a bract of susceptible immature cotton bolls. The artificially infested bolls were later harvested and examined for evidence of PBW infestation. High percentages of both Bt and non-Bt cotton bolls had numerous larval entrance holes in the carpel walls of the bolls. Less than 1% of the Bt cotton bolls and over 70% of the non-Bt cotton bolls were found with living PBW larvae. Bt cotton bolls of the late-season second fruiting cycle were as resistant to PBW infestation as Bt cotton bolls of the first fruiting cycle.

Last Modified: 9/29/2014
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