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ARS Home » Research » Publications at this Location » Publication #93465
Title: BEMISIA ARGENTIFOLII ADULTS CAUGHT IN CC WHITEFLY TRAPS AT DIFFERENT TRAP HEIGHTS AND TRAP CATCH RELATIONSHIPS TO LEAF-TURN COUNTS ON COTTON

Author
item CHU, CHANG CHI
item HENNEBERRY, THOMAS
item NATWICK, ERIC - UNIV OF CA, HOLTVILLE, CA

Submitted to: Southwest Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/1/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary: A new whitefly trap (named CC trap) was developed for monitoring silverleaf whitefly population densities in cotton fields. The traps must be placed below the cotton plant terminals for a reliable evaluation of the silverleaf whitefly densities on cotton leaves. The trap catches of adult silverleaf whiteflies were well correlated with adults counted on leaves using leaf-turn method when the adults density was over 5 adults per leaf. When the traps were placed at five different levels from plant bed to the top of cotton plants on the same stake, one may use the trap catches to estimate the within plant distribution of whitefly adults in cotton fields.

Technical Abstract: The effects of trap placement on adult Bemisia argentifolii Bellows and Perring catches in a new whiteflytrap (CC trap) in cotton fields were studied in California and Arizona in 1996 and 1997. In a no-choice study in 1996, more adults were caught in traps placed 15 cm below the top of the cotton canopy comparedwith traps placed at canopy top or 15 cm above the plant canopy. Traps caught more whitefly adults in the Stoneville 474 and Louisiana 887 plots compared with traps placed in the Deltapline 5415 and 5461 plots, reflecting the same differences in adult populations on the leaves in the plots, as determined using the leaf- turn method. In a no-choice trap study in 1997, trap catches were significantly correlated with leaf-turn counts with traps placed at the top of cotton beds, 30, 60, 90 and 120 cm above plant beds. Significant correlations occurred from 21 August to 18 September when the leaf-turn adult counts were 54 or more adults per ten leaves. In a choice study in 1997, trap catches from 14 August to 18 September were significantly correlated with the leaf-turn adult counts for traps placed from 30 to 120 cm above cotton beds.