ECO-FRIENDLY MANAGEMENT OF SOYBEAN POD BORERS WITH SPECIAL REFERENCE TO Cydia ptychora (Meyrick) (LEPIDOPTERA : TORTRICIDAE)
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Date
2005
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University of Agricultural Science, Dharwad
Abstract
"Investigations were carried out to compute the EIL (economic injury level) of
soybean pod borer Cyd'ia ptychora (Meyrick) and to test the efficacy of organic
amendments, biorationais and new generation chemicals against the pod borers of
soybean at Main Agricultural Research Station, Dharwad during the year 2004.
The crop loss estimation under glasshouse condition revealed a significant
and positive correlation between the number of larvae per plant and reduction in
grain weight. Based on the regression analysis and gain threshold, the EIL of
C. ptychora was computed to be 0.45 larva/plant.
Among the combinations of organic amendments, RDF + FYM + NC was the
best combination recording least per cent pod damage and highest grain yield of
soybean. Also, application of neem cake either in half dose (250 kg/ha) or full dose
(500 kg/ha) had no significant difference when combined with RDF and FYM or RDF
and vermicompost. Among the botanicals, NSKE (neem seed kernel extract) 5 per
cent was found best.
The effect of organic amendments and biorationais on the incidence of the
mycopathogen, Nomuraea n/ey/(Farlow) Samson revealed that organic amendments
did not affect the mycopathogen, but among the biorationais, vermiwash was safer to
N. rileyi. Also, organic amendments did not affect the predators viz., coccinellids and
chrysopids eventhough, among the biorationais, vermiwash was safer to these
predators.
When the new generation chemicals were evaluated along with certain
ecofriendly components for their efficacy against pod borers, it was noticed that
spinosad, lambdacyhalothrin and indoxacarb were better recording highest yield and
lowest per cent pod damage, but they were detrimental to the mycopathogen,
N. rileyi and predators viz., coccinellids and chrysopids. But, the highest B:C ratio
was noticed in vitex leaf extract."
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No. of references 152