Abstract
Interactions of cotton genotypes, planting patterns, irrigation levels, and insecticide treatments were examined separately and in combination in split-pot experiments to determine if certain combinations could be used to avoid damage by boll weevil, Anthonomus grandis Boheman. Studies were conducted in 2 cotton seasons in a series of 5 experiments at 3 locations in Texas. Insecticide was applied at 2 levels to each primary experiment for control of colonizing overwintered weevils. In 4 tests all insecticide applications were completed about a week before first bloom; a fifth was chemically protected during the entire season. Either 1 or 2 irrigations were applied to genotypes planted on conventional 38 in. rows, 38 in. double-drill rows, or 25 1/3 in. single-drill rows. At 1 test site, 3 insecticide applications for a heavy overwintered weevil infestation did not prevent severe damage, although lint yields were increased over plots treated with 1 applications. Insecticide applications for light to moderate overwintered weevil numbers at other test locations reduced first and delayed second generation build-up. At certain locations, the second generation was large and appeared damaging. However, substantial boll set occurred in rapid-fruiting genotypes, and yields of 700-900 lb lint/acre were recorded. A 1-month blooming period before heavy weevil build-up allowed substantial lint yields in spite of second generation weevils. Double-drill 38 in. and single-drill 25 1/3 in. row spacings produced more squares, blooms, bolls, and lint than did conventional spacing. Generally, row spacing had the greatest treatment effect, increasing yields over 100 lb/acre. The most effective combination evaluated was a rapid-fruiting genotype planted in narrow rows and treated 3 times for overwintered weevils. ...
Parker, Roy Denver (1979). Interaction of cotton genotypes with boll weevil, Anthonomus grandis Boheman, populations as influenced by planting pattern, irrigation level, and insecticide treatment. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -745279.