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Title: EFFECTS OF COTTON VARIETY SELECTION AND INSECTICIDE TREATMENTS ON SILVERLEAF WHITEFLY INFESTATION LEVELS

Author
item NATWICK, ERIC - UCC DREC, HOLTVILLE, CA
item CHU, CHANG CHI
item COHEN, ALLEN
item SIMMONS, G - USDA-APHIS PPQ BRAWLEY,CA
item BRUSHWOOD, DONALD

Submitted to: Silverleaf Whitefly: 1997 Supplement to the Five Year National Research and
Publication Type: Abstract Only
Publication Acceptance Date: 8/1/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Seventeen cotton varieties were sown at the UC Desert Research & Extension Center into plots of a randomized complete block design experiment with split plots, replicated four times, and irrigated 20 March, 1996. Individual plots measured 14m in length with 8-beds on 1m centers. Insecticide treatments were applied as a foliar spray a total of 7 times at tweekly intervals starting 11 June, 1996. Silverleaf whitefly adults were sampled from 5 plants at random in each plot via the leaf turn method using the 5th main stem leaf from the terminal on 17 & 24 June, and 1, 8, 16, & 29 July, 1996. Silverleaf whitefly eggs and nymphs were counted on two leaf disks of 1.25 cm sq from 5-5th position leaves down from the terminal extracted from randomly selected plants in each plot on 17 & 24 June, and 1, 8, 16, 22 & 29 July, 1996. Seed cotton was hand picked from 0.002 acre/ plot. Cotton samples were ginned and lint samples have been sent to the USDA/ARS Cotton Quality Research Station in Clemson, SC for stickiness and sugar analysis. All sub-plots receiving the insecticide treatments had significantly lower numbers of whitefly adults and nymphs on all sampling dates than the same varieties from the sub-plots that did not receive the insecticide treatments with no significant interactions between varieties and insecticide treatments.