MANAGEMENT OF WILT COMPLEX IN BRINJAL (Solanum melongena L.) CAUSED BY Meloidogyne incognita (Kofoid and White) Chitwood AND Ralstonia solanacearum (Smith) Yabuchi
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41126
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Brinjal is an important warm season vegetable crop of the world,
India and Karnataka. Among the major diseases, root knot caused by
Meloidogyne incognita is a limiting factor in commercial production of the
crop. The problem is aggravated by the association of the nematode with
other soil micro organisms such as Ralstonia solanacearum leading to
disease complex. Out of six brinjal cultivars screened for M. incognita-R.
solanacearum wilt disease complex under field conditions, cultivar Arka
Neelkanth showed moderately resistant reaction to wilt complex. It
recorded 14 per cent wilt incidence and 68 galls/plant and 48.25 egg
masses/root system. Arka Shirish was highly susceptible to wilt
complex. It recorded 87.5 % wilt, 178 galls/plant and 128 egg masses
per root system. Interaction studies of R. solanacearum and M. incognita
revealed that inoculation of M. incognita, 15 days prior to the inoculation
of R. solanacearum led to maximum wilt incidence (100 %) followed by
combined inoculation of both the pathogens simultaneously (75 %).
Among the treatments tested to manage wilt complex under field
condition, mustard intercrop + streptocycline @ 0.5 g/lit + COC 50% WP
(1g/lit) reduced bacterial wilt incidence (23.35%). It recorded 63.33
galls/root system which accounted to 72.54 per cent reduction over
control and recorded an yield of 1.92 kg/25 m2 followed by mustard
intercrop + P. fluorescens @ 20g/m2 (1×108) which was effective in
reducing wilt by 28.35 per cent. It recorded 51.66 galls/root system
which accounted to 77.60 per cent reduction over control and recorded
1.78 kg/25 m2.
Department of Plant