Abstract
A method was developed for estimating the number of surviving tobacco whitefly (TWF),Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae), nymphs after insecticide applications, based on the number of honeydew droplets ejected by TWF nymphs in 30 minutes. Honeydew droplets excreted by live TWF nymphs on a water-sensitive paper (Ciba-Geigy) stained blue and could easily be observed and counted. To estimate the number of live nymphs on an infested cotton leaf, the number of droplets ejected during 30 min was divided by a factor of 1.29.
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References
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Melamed-Madjar, V., Cohen, S., Chen, M., Tam, S. and Rosilio, D. (1979) Observations on populations ofBemisia tabaci Gennadius (Homoptera: Aleyrodidae) on cotton adjacent to sunflower and potato in Israel.Israel J. Ent. 13: 71–78.
Melamed-Madjar, V., Gerson, U. and Tal, S. (1983) A laboratory method for estimating survival of tobacco whitefly nymphs after insecticide treatment, based on honeydew excretion.Phy toparasitica 11: 25–32.
Navon, A. and Melamed-Madjar, V. (1984) Honeydew staining techniques for estimating the live tobacco whitefly nymph population on cotton leaves.Phytoparasitica 12: 199–202.
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Melamed-Madjar, V., Navon, A. & Tal, S. Honeydew staining to evaluate survival of tobacco whitefly nymphs after insecticide application. Phytoparasitica 12, 157–161 (1984). https://doi.org/10.1007/BF02981167
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DOI: https://doi.org/10.1007/BF02981167