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United States Department of Agriculture

Agricultural Research Service

Title: Silverleaf Whitefly Lint Stickiness, and Cotton Yields in Low and High Plant Populations of Untreated and Insecticide-Treated Long and Short Staple Cottons

Authors
item Henneberry, Thomas
item JECH, LYNN
item Hendrix, Donald
item PERKINS, HENRY
item Brushwood, Donald

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: June 1, 1997
Publication Date: N/A

Interpretive Summary: Cotton plant densities of 10 or 40 thousand plants/acre had no effect on numbers of silverleaf whitefly adults, eggs, nymphs, extracted sugars from lint samples or thermodetector sticky cotton counts. Higher numbers of whiteflies occurred in early-season in Pima S-7 cotton than in DPL50 or DPL5415 cotton. Seasonal averages for sugars, % of total reducing sugars and thermodetector counts were higher for DPL50 compared with Pima S-7 but not DPL5415. Most of the sugar analyzed from lint samples occurred during a 24 d period from 22 August to 15 September for all cultivars harvested 25 September. Insecticide treatments reduced thermodetector counts and associated sugars extracted from lint. Sticky cotton results for 20 boll randomly picked samples were comparable with results from total open cotton/plant harvests but both sample methods gave significantly lower individual sugar, percentage of total reducing sugars and thermodetector counts compared with machine-picked total cotton plot harvests. DPL50 and DPL5415 produced significantly more cotton than Pima S-7. Higher lint yields occurred in plots planted at 40,000 plants per acre compared with 10,000 plants per acre. Highest cotton harvests were obtained by hand picking all open bolls from all plants in 13.1 foot of row weekly as compared to a single 13.1 foot of row pick on 13 September and machine picking (spindle) on 25 September.

Technical Abstract: Cotton plant densities of 10 or 40 thousand plants/acre had no effect on numbers of silverleaf whitefly adults, eggs, nymphs, extracted sugars from lint samples or thermodetector sticky cotton counts. Higher numbers of whiteflies occurred in early-season in Pima S-7 cotton than in DPL50 or DPL5415 cotton. Seasonal averages for sugars, % of total reducing sugars and thermodetector counts were higher for DPL50 compared with Pima S-7 but not DPL5415. Most of the sugar analyzed from lint samples occurred during a 24 d period from 22 August to 15 September for all cultivars harvested 25 September. Insecticide treatments reduced thermodetector counts and associated sugars extracted from lint. Sticky cotton results for 20 boll randomly picked samples were comparable with results from total open cotton/plant harvests but both sample methods gave significantly lower individual sugar, percentage of total reducing sugars and thermodetector counts compared with machine-picked total cotton plot harvests. DPL50 and DPL5415 produced significantly more cotton than Pima S-7. Higher lint yields occurred in plots planted at 40,000 plants per acre compared with 10,000 plants per acre. Highest cotton harvests were obtained by hand picking all open bolls from all plants in 13.1 foot of row weekly as compared to a single 13.1 foot of row pick on 13 September and machine picking (spindle) on 25 September.

Last Modified: 7/25/2014
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