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Effects of increasing, constant, and fluctuating patterns of square removal (averaging 45% for 8 weeks) on fruiting characteristics, early date, and yield of Coker 100 W cotton in North Carolina were investigated during 1957-59 in an area protected from boll weevils, Anthonomus grandis Boheman. Plants compensated for each pattern of square removal by increasing square production. the percentage of bolls set, and the average weight of bolls. However, the extent to , which each of these plant responses contributed to the total compensation varied with the patterns of square removal. The increasing pattern of square removal increased square production the least, the constant pattern increased average boll weight the least. and the fluctuating pattern increased the percentage of bolls set the least. Effects of the different patterns of square removal on yield were not significant, but effects on early date of production and harvest were significant and of practical importance. The fluctuating pattern of square removal delayed total production 10 days and total harvest 15 days. Both production and harvest were delayed an additional 2 weeks by the constant pattern of square removal and 3 weeks by the increasing pattern. The fluctuating pattern of square removal more nearly approximates weevil infestations in North Carolina, and it is potentially less detrimental to cotton production than the constant and increasing patterns. The effect of boll weevil square infestation on the yield of treated cotton was similar to the effect of square removal on the yield of protected cotton, that is, up to 45% (8-week average) square infestation or removal had no significant effect on yield. At about this level of square infestation, the yield of untreated cotton was reduced 50-60%, principally because of boll damage and boll abscission caused by weevil attack. Thus, within this level of square infestation, protection of the yield was mostly a matter of protecting bolls. Three treatment schedules are described which protected the yield at square-infestation levels, ranging from about 10 to 45%.
Document Type: Research Article
Publication date: August 1, 1968
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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.