Ecofriendly Management of Major Insect Pests of Soybean
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Date
2013
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JNKVV
Abstract
ABSTRACT
Present research work on “Ecofriendly management of major insect pests of soybean” (Glycine max (L.) Merrill was carried out in the experiment field of Department of Plant breeding and genetics, Adhartal, JNKVV, Jabalpur (M.P) during kharif season 2011-12 with the objectives, to study the seasonal incidence of major insect pests of soybean, screening of soybean varieties/genotypes against major insect pests and to study the impact of integration of biopesticides and chemical insecticides for the management of major insect pests of soybean
Incidence of whitefly started from 30th SW (4th week of July) with an average population of 0.83 whitefly/trifoliate leaf and remained active till the maturity of the crop.Correlation of whitefly population with meteorological parameters did not exhibit significant influence.
Incidence of Jassid started from 32nd SW (1st week of August) with an average population of 0.36 jassids/trifoliate leaf. The population of the pest gradually increased up to 36th SW (1st week of September). Maximum population was observed 1.0 jassid/trifoliate leaf during 37th SW (2nd week of September).Correlation of jassid population with meteorological parameters did not exhibit significant influence.
The incidence of Gesonia gemma started in the 32nd SW (1st week of August) with an average of 0.66 larvae/mrl. The maximum activity was noticed during 35th SW (4th week of August) 1.33 larvae/mrl.Correlation of Gesonia gamma with meteorological parameters indicated that minimum temperature and morning relative humidity exhibit significant positive correlation
Incidence of the Chrysodeixis acuta during the season was very low, it started in the 33rd SW (Second week of August) with an average of 0.22 larvae/mrl. The maximum activity was noticed during 37th SW (second week of September) with an average of 0.66 larvae/mrl. Correlation of Chrysodeixis acuta population with meteorological parameters did not exhibit significant influence.
The incidence of Spodoptera litura started in the 34th SW (3rd week of August) with an average of 0.22 larvae/mrl. However, attained its peak during 38thSW (third week of september) 2.33 larvae/mrl. Correlation of S. litura with meteorological parameters indicated that, minimum temperature, evening relative humidity exhibited significant negative correlation.
The incidence of stem fly observed in 32nd SW (1st week of August) and recorded 30% infested plants with 4.87% stem tunneling. Correlation of stemfly with meteorological parameters did not exhibit significant influence.
On the basis of sucking pest population JS-20-38, JS-97-52, JS-95-60, JS-20-35 and JS-20-41 were less susceptible against whitefly. While NRC-37 and JS-335 were less susceptible against jassids. On the basis of larval population of soybean defoliators JS-93-05, JS-20-29, JS-95-60, JS-20-34, JS-20-41, JS-335, JS-97-52 and JS-20-38 were less susceptible against G. gemma. JS-93-05, JS-97-52, JS-20-41, JS-95-60, JS-20-29, JS-335 and JS-20-38 were less susceptible against C. acuta. Variety/genotype JS-93-05, JS-95-60, NRC-37, JS-20-35, JS-20-34 and JS-20-29 were less susceptible against S.litura. JS-93-05, JS-97-52, NRC-37 and JS-335 recorded significantly higher grain yields i.e. 2733.33, 2263.33, 2223.33 and 2186.67kg/ha respectively, in compression to rest of the varieties/genotypes. While significantly lower yield was recorded from JS-95-60, JS-20-41, JS-20-38, JS-20-35, JS-20-29 and JS-20-34.
Maximum grain yield was recorded in JS-93-05, (2733.33 kg/ha) followed by JS-97-52, NRC-37 and JS-335 (2263.33, 2223.33 and 2186.67kg/ha respectively), in compression to rest of the varieties/genotypes. While significantly lower yield was recorded from JS-20-34 (1950.00kg/ha) and was on par with that recorded from rest of the varieties/genotypes.
Treatment Triazophos 40EC @ 800ml/ha sprays twice at 10 days interval, Beauveria bassiana @ 1kg/ha and after 10 days Triazophos 40EC @ 800ml/ha and Metarrhizium anisopliae @ 3kg/ha and after 10 days Triazophos 40EC @ 800ml/ha were found to be most effective in controlling defoliators and sucking pest. Also, these treatments recorded higher grain yield (1610.93 kg, 1590.62 and 1559.92 kg kg/ha respectively) with net return Rs. 8134.9, Rs. 6304.6 and Rs. 6939.6/ha and CBR 1:4.06, 1:2.74 & 1:2.68 respectively.