Sampling Adult Sweetpotato Whitefly in Cotton

E.T. Natwick, W. Leimgruber, N.C. Toscano, and L. Yates


 
ABSTRACT

Seven methods were evaluated for sampling sweetpotato whitefly Bemisia tabaci (Gennadius) in cotton. The methods included; three types of yellow sticky traps (cylindrical trap measuring 3 inches in diameter by 6 inches in height, a vertically placed trap measuring 3 inches by 5 inches and a vertically placed trap measuring 1.5 inches by 1.5 inches), two insect suction devices (a D-vac insect vacuum and a "bug buster"), a black pan measuring 16 inches by 10 inches coated with a thin film of vegetable oil, and whole plant samples enveloped in clear plastic bags. The cylinder trap, Dvac, and 3 inch by 5 inch trap produced the highest whitefly counts and best reflected seasonal population increases along with the black pan. The 1.25 inch by 1.5 inch trap and bug buster produced the lowest whitefly counts and the black pan and whole plant sample produced intermediate whitefly counts. Comparing variances, the 3 inch by 5 inch trap, 1.25 inch by 1.5 inch trap, black pan and D-vac produced the least variable data while the cylinder trap, bug buster and whole plant had the greatest variances. The 3 inch by 6 inch cylinder, D-vac and black pan were highly correlated to the 3 inch by 5 inch trap standardly used for whitefly sampling by pest control advisors.



Reprinted from 1992 Proceedings Beltwide Cotton Conferences pp. 691 - 692
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998