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Title: BEMISIA ARGENTIFOLII ADULT, NYMPH AND EGG DENSITIES AND EGG DISTRIBUTION ON SELECTED UPLAND COTTONS.

Author
item Chu, Chang Chi
item FREEMAN, THOMAS - NDSU, FARGO, ND
item NATWICK, ERIC - COOP. EXT. HOLTVILLE, CA
item Buckner, James
item Nelson, Dennis
item Henneberry, Thomas

Submitted to: Journal of Entomological Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/1/1999
Publication Date: N/A
Citation: Chu, C., Freeman, T., Natwick, E.T., Buckner, J.S., Nelson, D.R., Henneberry, T.J. 2000. Bemisia argentifolii adult, nymph and egg densities and egg distribution on selected upland cottons.. Journal of Entomological Science. 35:39-47

Interpretive Summary: Oviposition of whitefly has been used as an indicator of adult behavior, host plant preferences, host plant resistance, and effectiveness of insecticide treatments. We used five upland cotton cultivars to study the silverleaf whitefly eggs laying behavior. Deltapine 5415 and 5432 had the most numbers of eggs laid on underleaf surfaces in fields and Siokra L-23 the lowest. Examination of the pattern of eggs laid on underleaf surfaces of leaves sampled from fields showed that more than 75% of eggs were laid between veins and 23% were laid in small veins (LT or = 4 cells wide). few eggs were laid on veins 5 or more cells wide. No egg stalks were inserted into leaf stomata.

Technical Abstract: Five upland cotton, Gossypium hirsutum L., cultivars, Deltapine (DPL) 50, 5415 and 5432, Fibermax 832 and Siokra L23, were studied in relation to silverleaf whitefly, Bemisia argentifolii Bellows and Perring, oviposition and colonization. Deltapine 5415 and 5432 had the highest numbers of eggs and nymphs and Siokra L-23 the lowest. Siokra L-23 also had the lowest number of adults compared to the other four cultivars. Over 75% of eggs were oviposited on leaf surfaces between veins and 23% were oviposited in veins that were LT or = 4 cells wide. Few eggs were found on veins that were 5 or more cells wide. No eggs were inserted into leaf stomata.