EVALUATION OF MICROBIALS AND BOTANICALS AGAINST DEFOLIATORS OF SOYBEAN.
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Date
2017-08-18
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Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola
Abstract
The present investigation entitled: “Evaluation Of Microbials And Botanicals Against Defoliators Of Soybean” was conducted during Kharif season of 2016 at Experimental Farm of Department of Entomology, Post Graduate Institute, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola.
Treatments reveled that Beauveria bassiana and Nomuraea rileyi each @ 7.5 g / l and neem seed extract 5 % were most effective in reducing the population of green semilooper and tobacco leaf eating caterpillar as well as registered highest yield of soybean.
Dashparni extract 12.5 ml / l was least effective in reducing the semilooper population and higher yield of soybean. Further, this treatment was not effective against Spodoptera litura.
The neem seed extract 5 % was economically most effective treatment against soybean defoliators followed by N. rileyi @7.5 g/l.
Description
1. Total four sprays as per treatments were undertaken at 15 days interval starting from 15 days after emergence of the crop.
2. Observations on defoliators (semilooper Chrysodeixis acuta , tobacco leaf eating caterpillar Spodoptera litura, and hairy caterpillar Spilosima obliqua if any) and natural enemies, lady bird beetle, chrysopa, and spider was recorded 24 hours before and after 3,7,10, and 14 days after each sprays.
3. The Observations on the larval population of defoliators was recorded from each one meter row length (mrl) by randomly selecting five spots of one meter row length in each plot and average number of larvae /mrl was worked out.
4. Observations on natural enemies was recorded by randomly selecting five plants from each net plots and average number per plant were calculated separately.
5. The yield data from each plot was recorded at maturity stage.
6. The data thus obtained from the above experiment was subjected to statistical analysis after appropriate transformation. Lastly economics and the ICBR of various treatments were calculated.
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Citation
BOCHARE, GANGADHAR DHUPA.(2017). Evaluation Of Microbials And Botanicals Against Defoliators Of Soybean. Department Of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, M.Sc.2017, xii,82p.(Unpublished).