The effects of row direction and row spacing on plant development and on Populations: of the boll weevil. Anthonomus grandis grandis Boheman. in dryland cotton in the Texas Rolling Plains were studied from 1981 to 1983. A precision planter was used to obtain equal plant densities in all row directions and row spacings each year. Rows were oriented in east/west (E/W) and north/south (N/S) compass directions. The three row spacings were 51. 69, and 102 cm. Row direction did not affect plant canopy diameters or square production. Canopy diameters were significantly larger in the 102-cm spacing, but significantly more squares were produced in the 51-cm spacing. There were no yield differences between row spacings or row directions. Row spacing had little effect on soil surface temperatures under the plant canopy, but soil temperatures were considerably higher in N/S rows than in E/W rows. Boll weevil survival in fallen squares under the plant canopy was significantly higher in E/W rows than in N/S rows, and survival was higher in the 102- cm spacing than in the 51- or 69-cm spacings. A multiple regression analysis indicated that both soil temperature and canopy diameter interact to influence survival of boll weevils in fallen squares. Boll weevil damage to squares and bolls on the plant was significantly higher in N/S rows than in E/W rows, and damage was significantly greater in the 51-cm spacing than in the 60- and 102-cm spacings. Boll weevil damage was highest in the 51-cm spacing, and yields were not improved in the 51- or 69-cm spacings. Therefore, narrow-row production cannot be recommended as a boll weevil management strategy for dryland cotton production in the Texas Rolling Plains.
Document Type: Research Article
Publication date: April 1, 1986
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.