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ARS Home » Research » Publications at this Location » Publication #114724
Title: SILVERLEAF WHITEFLY COLONIZATION ON UPLAND COTTONS AND RELATIONSHIPS TO LEAF MORPHOLOGY AND LEAF AGE

Author
item CHU, CHANG CHI
item FREEMAN, THOMAS - NDSU, FARGO, ND
item BUCKNER, JAMES
item HENNEBERRY, THOMAS
item NELSON, DENNIS
item WALKER, GREG - U CA, RIVERSIDE, CA
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: Silverleaf whitefly colonization on Stoneville (ST) 474 and Deltapine (DPL) 5415 cottons in the field was examined in relation to leaf trichome density, leaf age and leaf morphological characteristics as possible factors influencing cultivar host selection. The increased numbers of all silverleaf whitefly life stages on ST 474 in the field appeared to be related to the higher trichome density on abaxial leaf surfaces compared with DPL 5415. In both cultivars, leaves from node #1 below the terminals were smaller and had higher vascular bundle densities and numbers of lysigenous glands than older, larger leaves. Younger leaves also had smaller leaf areole areas, more terminal vein endings per unit leaf area, and shorter distances from abaxial leaf surfaces to minor vein phloem tissues compared with older leaves. These younger leaf morphological characteristics may contribute to the higher silverleaf whitefly densities on younger leaves compared with older leaves. In the laboratory, electronically monitored adult females and visually monitored settled 1st and 4th instar nymphs preferred to probe into secondary and tertiary leaf veins as compared with main and primary leaf veins.