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ARS Home » Research » Publications at this Location » Publication #114735
Title: COTTON LEAF TRICHOMES AND SILVERLEAF WHITEFLY DENSITY RELATIONSHIP

Author
item CHU, CHANG CHI
item FREEMAN, THOMAS - NDSU, FARGO, ND
item BUCKNER, JAMES
item HENNEBERRY, THOMAS
item NELSON, DENNIS
item NATWICK, ERIC - U CA COOP EXT, HOLTVILLE

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: Higher trichome density on underleaf surfaces has been attributed to higher silverleaf whitefly density on different cotton cultivars. Studies were conducted to determine whether the positive trichome-insect density relationship holds true among the leaves on main stem leaf nodes. The hairy Stonville (ST) 474 leaves had higher branched trichome densities as well as silverleaf whitefly densities compared with those on smooth NuCOTN (Nu) 33B leaves in a field study at Maricopa, AZ. Mean numbers for trichome and silverleaf whitefly nymphs were 6.9 and 6.0 per 37 mm sq leaf area for ST 474 compared with 1.7 and 2.9 for Nu 33B, respectively. However, this trichome-insect density relationship did not hold true when leaves from main stem leaf nodes #1, 2, 3, 4, 5, 7, 10 and 15 were compared. The branched trichome densities were 12.3, 8.4, 7.8, 4.9, 7.4, 6.0, 4.6 and 3.5 per 37 mm2 leaf area on leaves of those leaf nodes for ST 474, but nymph densities were 0.1, 4.1, 13.1, 13.4, 7.1, 7.5, 1.8 and 0.9 per 37 mm sq leaf area. For Nu 33B the branched trichome densities were 3.5, 2.9, 1.8, 1.9, 1.4, 0.9, 0.9 and 0.2 per 37 mm sq leaf area and 0.1, 1.8, 4.6, 4.5, 5.6, 3.0, 1.8 and 2.0 per 37 mm sq leaf area. It appears that factors other than trichome density also influence silverleaf whiteflies colonization. Studies are in progress to examine factors influencing leaf age-silverleaf whitefly density relationship.