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Title: NORMAL LEAF AND OKRA-LEAF UPLAND COTTON CULTIVARS SUSCEPTIBILITY TO INFESTATION BY SILVERLEAF WHITEFLY

Author
item NATWICK, ERIC - U CA COOP EXT, HOLTVILLE
item WALKER, GREG - U CA, RIVERSIDE, CA
item JOHNSON, D - U CA, RIVERSIDE, CA
item CHU, CHANG CHI
item HENNEBERRY, THOMAS
item BRUSHWOOD, DONALD
item CONSTABLE, G - CSIRO, NSW AUSTRALIA

Submitted to: Sweetpotato Whitefly Progress Review Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/1/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Sixteen upland cotton cultivars and experimental breeding-lines were evaluated in the field for susceptibility to silverleaf whitefly sown at Imperial Valley, CA, into plots of a randomized complete block design experiment replicated four times, and irrigated March 1999. The normal leaf cultivars were DP 20, DP 50, DP 90, DP 5415, DP 5432, DP 5461, DP 5557, HCR 9257, HCR 9240, HCR 7126, and, Stoneville 474 and the okra-leaf cultivars and experimental breeding-lines were Siokra L23, FiberMax 832, CSIRO 91209-194, and CSIRO 89230-244-1028. Individual plots measured 14 m length with 8-beds on 1 m centers or 8m wide. No insecticides were applied to the cotton plots. Whitefly adults were sampled from 10 plants at random in each plot via the leaf turn method using the 5th main stem leaf from the terminal in Aug 1999. Whitefly nymphs were counted on 1.65 cm(2) leaf disks of from ten 5th position leaves down from the terminal extracted from mrandomly selected plants in each plot in Jun, Jul & Aug. Seed cotton was hand picked from 0.002 acre per plot and yield data were recorded in Sep 1999. The okra-leaf entries as a group had fewer whitefly adults and nymphs than the normal leaf cotton entries. The okra-leaf experimental breeding-lines CSIRO 91209-194, and CSIRO 89230-244-1028 had the lowest numbers of whitefly adults and nymphs among the okra-leaf entries. Stoneville 474, a hirsute-leafed cotton, had the greatest numbers of whitefly adults and nymphs among the normal leaf cottons.