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104 221 222 Bedford, I. D., Briddon, R. W., Markham, P. G., Brown, J. K. and Rosell, R. C. (1992): Bemisia tabaci - biotype characterisation and

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Butter, N. S. and Rataul, H. S. (1997): Effect of TLCV infection on Bemisia tabaci (Homoptera: Aleyrodidae). Entomon. 2, 163-164. Effect of TLCV infection on Bemisia tabaci

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heat units Proc. Amer. Soc. Hort. Sci. 1960 76 682 692 Bosco, D. and Caciagli, P. (1998): Bionomics and ecology of Bemisia tabaci (Sternorrhyncha: Aleyrodidae) in Italy. Eur. J. Entomol. 95

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Fransen, J. J. (1994): Bemisia tabaci in the Netherlands, Here to Stay? Pesticide Science 42, 129-134. Bemisia tabaci in the Netherlands, Here to Stay

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Bemisia tabaci (Gennadius) on urdbean, Vigna mungo (Linnaeus) Hepper. J. Insect Sci. 22, 388–392. Kooner B. S. Evaluation of insecticides against Bemisia tabaci (Gennadius) on urdbean

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Abdullahi, I. 2001: Diversity of whitefly (Bemisia tabaci Genn), Vector of African Cassava Mosaic Geminivirus. Ph. D. Thesis, University of Ibadan. 164 p. Ahohuendo, B. C., Sarkar, S

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Artemisia herba-alba (Asso) and Artemisia monosperma (Delile) essential oils were tested against three sucking insect pests under laboratory and greenhouse conditions. These pests included Bemisia tabaci (Gennadius), Aphis gossypii (Glover) and Thrips tabaci (Lindman). Laboratory results showed that the LC50 of A. herba-alba and A. monosperma were 0.042, 0.075% for eggs and 0.074, 0.186% for immature stages of B. tabaci. Also, both oils gave a high toxicity on A. gossypii with LC50 0.023 and 0.085%. Artemisia herba-alba and A. monosperma were more toxic on T. tabaci and A. gossypii than B. tabaci in the laboratory test. In contrast T. tabaci was sensitive for both oils (LC50 0.038 and 0.011%). These oils were efficient for controlling tested insects on cucumber plants at greenhouses. This treatment caused 85.97, 82.17% reduction in the population of B. tabaci, 90.44, 87.99% for Aphis gossypii and 87.26, 84.99% for T. tabaci. Chemical analysis of A. herba-alba and A. monosperma oils detected the presence of hydrocarbon terpenes, oxygenated terpenes, hydrocarbon sesquiterpenes and oxygenated sesquiterpenes represented about 16.38%, 58.91%, 21.61%, 2.74% and 21.53%, 57.17%, 19.32%, 1.70%, of the oil content, respectively.

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): Predation by Nesidiocoris tenuis on Bemisia tabaci and injury to tomato. Biol. Control 54, 237–246. Urbaneja A. Predation by Nesidiocoris tenuis on Bemisia tabaci and injury to tomato

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1999 Dhawan, A. K. and Simwat, G. S. (1999): Population dynamics of whitefly Bemisia tabaci (Genn.) on cotton-an ecological approach. In: G. S

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49 56 Meyerdirk, D. E. and Coudriet, D. L. (1986): Evaluation of two biotypes of Euseius scutalis (Acari: Phytoseiidae) as predators of Bemisia tabaci (Homoptera

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