EPIDEMIOLOGY AND MANAGEMENT OF BACTERIAL WILT OF TOMATO
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Date
2020-10
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NAUNI,UHF
Abstract
ABSTRACT
Bacterial wilt of tomato (Ralstonia solanacearum) (Smith) Yabuuchi et al. appearing
in moderate to severe form in different tomato growing localities of Solan and Sirmaur
districts was observed as a serious disease of tomato. The bacterium isolated from infected
plants was identified as Ralstonia solanacearum (Smith) Yabuuchi et al. on the basis of
morphological, cultural and biochemical tests. The test pathogen indicated initial symptoms
as loss of turgidity within 4-5 days of inoculation of 3 week old seedlings which further
progressed to drooping/wilting of plants accompanied with vascular discoloration.
Epidemiological studies revealed rapid bacterial wilt development in acidic (pH <6.0) and
saturated soil (≥ 90%) at higher temperature levels (30-350C). The in vitro evaluation studies
indicated streptocycline as potent inhibitor of R. solanacearum while the in vivo studies
revealed the significant efficacy of streptocylcine @ 200ppm applied as seed & seedling root
dip treatment in combination with three periodic drenching with Bordeaux mixture @ 0.8%.
Field evaluation studies revealed treatment consisting of application of bleaching powder @
15kg/ha before transplanting, amending the soil pH to neutral with lime, seedling root dip
treatment with streptocycline @ 200ppm for 5 minutes in combination with four periodic
drenching with Bordeaux mixture @ 0.8% at 10 days interval starting with appearance of
disease as efficacious in limiting (65.47%) the bacterial wilt and enhancing the fruit yield
(380.7q/ha).