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Title: SILVERLEAF WHITEFLY COLONIZATION AND LEAF MORPHOLOGY RELATIONSHIPS IN UPLAND COTTON CULTIVARS

Author
item CHU, CHANG CHI
item COHEN, ALLEN
item NATWICK, E. - U OF C CO OP EXTENSION CA
item SIMMONS, G. - USDA-APHIS PPQ WR, BRA.CA
item HENNEBERRY, THOMAS

Submitted to: Sweetpotato Whitefly Progress Review Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Studies were conducted at Holtville, CA in 1996 to investigate the relationships between upland, Gossypium hirsutum L., leaf morphology and whitefly population densities. There were eight United States Deltapine (DPL) cultivars: DPL 20, 50, 90, 5415, 5432, 5461, 9050, and 9057 and six Australian cotton cultivars and breeding lines, CS 50, Siokra 1-4/649, Siokra L23, Siokra V-15, 87031-126, and 89013-114. Results showed that Australia okra-leaf cultivars and lines were colonized with fewer whitefly adults, eggs and nymphs compared to Australia and United States normal-leaf cultivars. The distances from underleaf surfaces of cotton leaves to the centers of nearest minor vascular bundles was negatively correlated with whitefly adult, egg and nymphal densities on leaves for all genotypes with exception of the Australian breeding line 89013-114. Our results suggest that the okra-leaf character and the distance from underleaf surfaces to the center of nearest minor vascular bundles of cotton leaves are genetic traits that have potential for breeding whitefly resistant upland cotton cultivars.