AbstractsBiology & Animal Science

Late Season Pink Bollworm Pressure in the Top Crop of Bt and Non-Bt Cotton

by Tim C. Knowles

Institution: University of Arizona
Year: 1999
Keywords: Agriculture  – Arizona; Cotton  – Arizona; Insect investigations
Record ID: 1703122
Full text PDF: http://hdl.handle.net/10150/197248


Green bolls (100/field) were sampled from the uppermost internodes within adjacent fields of Bt (Deltapine 33B) and non-Bt refuge (Hyperformer HS 44 or Deltapine 20) experiencing severe pink bollworm pressure late in the growing season. Evidence of 3rd instar or larger pink bollworm larvae survival was higher in susceptible bolls sampled from transgenic Bt cotton late in the 1998 growing season, compared to that observed late in the 1997 growing season.