Screening tomato and sweet-pepper genotypes resistance to Tomato leaf curl Bangalore virus and its vector Bemisia tabaci

Maruthi, M.N., Muniyappa, V., Green, S.K., Colvin, John and Hanson, P. (2003) Screening tomato and sweet-pepper genotypes resistance to Tomato leaf curl Bangalore virus and its vector Bemisia tabaci. International Journal of Pest Management, 49 (4). pp. 297-303. ISSN 0967-0874

Abstract

The primary objective of this study was to identify sources of
resistance to Tomato leaf curl Bangalore virus—Bangalore strain 4
(ToLCBV-[Ban4]) and its whitefly vector Bemisia tabaci (Gennadius) in
tomato and sweet-pepper genotypes, because resistant cultivars did not
exist. A total of 25 wild and cultivated tomato and nine sweet-pepper
genotypes obtained from the Asian Vegetable Research and Development
Centre, Taiwan and local cultivars were screened at the University
of Agricultural Sciences, Bangalore, India, both by whitefly-mediated
inoculation of virus in the glasshouse and natural infection in the field.
Resistance to virus was assessed by disease incidence, symptom
severity and DNA hybridisation tests. Resistance to B. tabaci was
measured by counting the number of eggs, nymphs and pupal cases on
the tomato genotypes. The wild species Lycopersicon peruvianum INRA
sel. and L. chilense LA 1969 were resistant to ToLCBV-[Ban4] but highly
susceptible to whiteflies, whereas L. hirsutum LA 1777 was resistant to
both the virus and the vector. Among the L. esculentum genotypes, H-
24, FL 744-6-9, FL 699 and FL 699 sp + were tolerant to ToLCBV-
[Ban4], but were susceptible to whiteflies. Of the nine pepper genotypes
inoculated with the virus, only five became infected, at low incidence
levels and none were suitable for the development of B. tabaci. Use of
tomato lines with resistance to both the virus and the vector offer the
best way of controlling these related problems, and the prospects for
tomato leaf curl virus disease management in South India are discussed.

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