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Damage potential of the spider mite Tetranychus ludeni (Acari: Tetranychidae) on four varieties of eggplant

Published online by Cambridge University Press:  28 February 2007

G.V.P. Reddy  and
P. Baskaran
G.V.P. Reddy*
Affiliation:
Agricultural Experiment Station, College of Natural and Applied Sciences, University of Guam, Mangilao, GU 96923, USA Department of Entomology, Faculty of Agriculture, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India
P. Baskaran
Affiliation:
Department of Entomology, Faculty of Agriculture, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India
*
*E-mail: reddy@guam.uog.edu
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Abstract

The damage potential of the spider mite Tetranychus ludeni Zacher was studied on 20–65-day-old seedlings of four eggplant Solanum melongena varieties: Madurai (MDU1), Coimbatore (CO1), Annamalai and Panruti at introduction levels of 2, 5, 10 and 15 mites/leaf. The average seedling mortality among varieties was lowest at the introduction level of two mites and maximum at the introduction level of 15 mites/leaf. The overall seedling mortality was 23% when the four levels of mite population were introduced on 20-day-old seedlings, and only 14% on 30-day-old seedlings. Among the different varieties, the MDU1 seedlings recorded higher mortality (1.6%) and Panruti the lowest (0.3%). The percentage losses in total plant height, number of leaves, number of flowers and fruits and fruit weight due to mite attack were highest (37–50%) in MDU1 and lowest (7–11%) in the variety Panruti. The other two varieties CO1 and Annamalai were found to be intermediate between Panruti and MDU1. The inoculated mites at different levels multiplied greatly on the variety MDU1 followed by CO1, Annamalai and Panruti. The extent of damage was higher in 35-day-old plants, when mites were introduced on 35- and 65-day-old seedlings. Therefore, the variety Panruti is recommended for cultivation in the study area in view of its resistance to T. ludeni.

Keywords

Solanum melogenaTetranychus ludenidamage potentielAcariTetranychidae

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Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 26 , Issue 1 , March 2006 , pp. 48 - 56
Copyright
Copyright © ICIPE 2006

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