Interaction of cotton genotypes with boll weevil, Anthonomus grandis Boheman, populations as influenced by planting pattern, irrigation level, and insecticide treatment.
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| Other Authors: | , , , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
[College Station, Tex.] :
Parker,
1979.
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| Subjects: | |
| Online Access: | Link to ProQuest copy Link to OAKTrust copy |
| 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. ... |
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| Item Description: | "Major subject: Entomology." Vita. |
| Physical Description: | xvii, 225 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references (leaves 195-204). |