Blessy Jose
Integrated Management of Sheath Rot of Rice (Oryza Sativa ) - Vellayani Department of Plant Pathology, College of Agriculture 1997
Sheath rot disease of rice, caused by Sarocladium
oryzae Gams and Hawksworth, is one of the most important
diseases of rice in Kerala. The present investigation was to
work out an efficient ecofriendly integrated control measure
utilising biocontrol agents and plant products in combination
with the minimum dose of fungicides against this disease.
The antagonists found effective against Sarocladium
oryzae are Trichoderma sp., Aspergillus sp. and Penicillium sp.
Among these, Trichoderma sp. was found to decrease the disease
intensity and increase the yield, the most.
tried,
best.
Among the various methods of application of antagonists
seed treatment and root dip method were found to be the
In the pot culture trial conducted to find out the mode
of action of antagonists under various systems of application,
none of the treatments proved superior to others.
Leaf extract of Ocimum sanctum (10 per cent) had
maximum inhibition of the radial growth of the fungus. Minimum
dry weight was seen with the bulb extract (10 per cent) of Allium
sativum and extract (10 per cent) of Ocimum sanctum.
Carbendazim at 0.025 per cent concentration brought about
100 per cent inhibition of radial growth and mycelial weight of
S. oryzae. Total inhibition of radial growth of the fun~u9 WBB
achieved by the application of 0.25 per cent Ediphenphos and
total inhibition of the mycelial growth was achieved by the
application of Ediphenphos at 0.075 per cent concentration.
For mass multiplication of antagonists, bits of jack
seeds proved to be the best substrate for Trichoderma ap. as
evidenced by fungal growth. Tapioca rind and wheat grains was
the best suited Aspergillus ap. Wheat bran:sand (1:10 w/w) proved
to be the best medium for Penicillium sp. For Pestalotiopsis Sp.,
wheat bran: sand mixture at a proportion of 1:3 and 1:10 were
found equally good.
The integrated management practices revealed that none
of the treatments were superior over others when yield and
disease intensity were considered. However, least disease
intensity was noticed with the application of Trichoderma sp. as
seed treatment, followed by foliar spray of Ediphenphos and leaf
extract (10 per cent) of Ocimum sanctum. Highest yield was
obtained in the treatment combination of Trichoderma sp, applied
as seed treatment followed by the foliar application of
Carbendazim and the bulb extract (10 per cent) of Allium
sativum.
632.3 / BLE/IN
Integrated Management of Sheath Rot of Rice (Oryza Sativa ) - Vellayani Department of Plant Pathology, College of Agriculture 1997
Sheath rot disease of rice, caused by Sarocladium
oryzae Gams and Hawksworth, is one of the most important
diseases of rice in Kerala. The present investigation was to
work out an efficient ecofriendly integrated control measure
utilising biocontrol agents and plant products in combination
with the minimum dose of fungicides against this disease.
The antagonists found effective against Sarocladium
oryzae are Trichoderma sp., Aspergillus sp. and Penicillium sp.
Among these, Trichoderma sp. was found to decrease the disease
intensity and increase the yield, the most.
tried,
best.
Among the various methods of application of antagonists
seed treatment and root dip method were found to be the
In the pot culture trial conducted to find out the mode
of action of antagonists under various systems of application,
none of the treatments proved superior to others.
Leaf extract of Ocimum sanctum (10 per cent) had
maximum inhibition of the radial growth of the fungus. Minimum
dry weight was seen with the bulb extract (10 per cent) of Allium
sativum and extract (10 per cent) of Ocimum sanctum.
Carbendazim at 0.025 per cent concentration brought about
100 per cent inhibition of radial growth and mycelial weight of
S. oryzae. Total inhibition of radial growth of the fun~u9 WBB
achieved by the application of 0.25 per cent Ediphenphos and
total inhibition of the mycelial growth was achieved by the
application of Ediphenphos at 0.075 per cent concentration.
For mass multiplication of antagonists, bits of jack
seeds proved to be the best substrate for Trichoderma ap. as
evidenced by fungal growth. Tapioca rind and wheat grains was
the best suited Aspergillus ap. Wheat bran:sand (1:10 w/w) proved
to be the best medium for Penicillium sp. For Pestalotiopsis Sp.,
wheat bran: sand mixture at a proportion of 1:3 and 1:10 were
found equally good.
The integrated management practices revealed that none
of the treatments were superior over others when yield and
disease intensity were considered. However, least disease
intensity was noticed with the application of Trichoderma sp. as
seed treatment, followed by foliar spray of Ediphenphos and leaf
extract (10 per cent) of Ocimum sanctum. Highest yield was
obtained in the treatment combination of Trichoderma sp, applied
as seed treatment followed by the foliar application of
Carbendazim and the bulb extract (10 per cent) of Allium
sativum.
632.3 / BLE/IN