Cotton whitefly Bemisia tabaci Genn. (Homoptera, Aleyrodidae) - a new pest of cotton plants in Turkmenia. I. A list of whiteflies and distribution of cotton whitefly in Central Asia

Sukhoruchenko, G.I.; Velikan' , V.S.; Niyazov, O.D.; Evdokarova, T.G.

Entomologicheskoe Obozrenie 74(3): 516-527

1995


ISSN/ISBN: 0367-1445
Accession: 002790387

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Abstract
Results are given of investigations in 1989-92 on the species composition of aleyrodids and their distribution on greenhouse and citrus crops and on roses in Tajikistan and Turkmenistan, and on the biology and population dynamics of Bemisia tabaci in Turkmenistan, where in a relatively short time this species has become the most numerous and injurious of these species on cotton, spreading to all oases. Other preferred crops are melon, aubergine, cabbage, Broussonetia and Hibiscus. Overwintering on greenhouse crops or on weeds such as nightshade [Solanum] and burs [Xanthium], on which it also lives throughout the year, it reaches high numbers outdoors in the 2nd half of the summer. In favourable years, colonization of cotton takes place in the phase of 5-6 true leaves, in unfavourable ones at mass bud formation. In both cases maximum numbers are reached at the end of the season. There are 5-7 generations a year, 3-5 of them on cotton, the summer generations lasting 16 and 18 days, the autumn ones 32. Males and females live 3-5 and 6-10 days, resp. Females lay 70-100 eggs in summer, 50-70 in the autumn. The only parasitoid recorded on cotton was Eretmocerus mundus; maximally 11% of puparia became attacked by this aphelinid in September, but parasitoids and predators are not capable of checking numbers of the pest on cotton.