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A. S. Gaurkhede ¹, S. K. Bhalkare ¹, A. K. Sadawarte ¹, D. B. Undirwade ¹

Affiliations
1 Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, AKOLA (M.S.), IN

Abstract

Studies were conducted to evaluate some new chemistry insecticide molecules as foliar application for their bioefficacy against major sucking pests and toxicity against predators of Bt transgenic cotton at Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeth, Akola during 2013-2014 with eight treatment and three replications. After third spray the application of flonicamid 50 WG@ 0.02 per cent, dinotefuran 20 SG @ 0.008 per cent and imidacloprid 30.5 SC @ 0.005 per cent proved effective in recording minimum aphid population i.e. 1.27, 1.37 and 1.92 aphids per leaf, respectively. The treatment with dinotefuran 20 SG @ 0.008 per cent and 0.006 per cent, fipronil 5 SC @ 0.015 per cent, acetamiprid 20 SP @ 0.004 per cent and flonicamid 50 WG @ 0.02 per cent successfully checked the incidence of leafhopper with in the range of 0.63 to 0.93 leafhoppers/leaf at third spray. The application of fipronil 5 SC @ 0.015 per cent, flonicamid 50 WG @ 0.02 per cent, imidacloprid 30.5 SC @ 0.005 per cent, dinotefuran 20 SG @ 0.008 per cent and acetamiprid 20 SP @ 0.004 per cent effectively minimized the incidence of thrips population with in the range of 2.59 to 3.60 thrips per leaf at the end of third spray. Whereas, acetamiprid 20 SP @ 0.004 per cent proved effective in lowering down the whitefly population (0.99 whiteflies/leaf), which was closely followed by flonicamid 50 WG @ 0.02 per cent (1.10 whiteflies/leaf), fipronil 5SC @ 0.015 per cent (1.11 whiteflies/leaf), dinotefuran 20 SG @ 0.008 per cent (1.20 whiteflies/leaf), and imidacloprid 30.5 SC @ 0.005 per cent (1.34 whiteflies/leaf). However, during the present studies no deleterious effect of insecticidal treatments were observed on population of natural enemies. The highest seed cotton yield was recorded in the plot sprayed with fipronil0.015 per cent, which was closely followed by dinotefuran 0.008 per cent, flonicamid 0.02 per cent, imidacloprid 0.005 per cent, acetamiprid 0.004 per cent and dinotefuran 0.006 per cent. On the basis of economics, imidacloprid 0.005 per cent proved to be the most economically viable treatment followed by acetamiprid 0.004 per cent, fipronil 0.015 per cent, dinotefuran 0.006 per cent and flonicamid 0.02 per cent. The present findings indicates that these insecticides can be suitably incorporated in an integrated management programme of sucking pests of cotton.

Keywords

Cotton, Pests, Dinotefuran, Flonicamid, Yield, ICBR.

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A. M. PARIHAR ¹, D. B. UNDIRWADE ¹, R. M. WADASKAR ¹, S. S. MADANKAR ¹

Affiliations
1 Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krushi Vidyapeeth, Akola - 444104, Maharashtra, IN

Abstract

Effect of various temperatures on the efficacy of five biorationals, viz. Beauveria bassiana (1.15% WP), Metarhizium anisopliae (1.15% WP), Bacillus thuringiensis (0.5% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) in terms of median lethal concentration (LC₅₀) value was evaluated against diamondback moth, Plutella xylostella larvae. The toxicity data for biorationals against P. xylostella on the basis of larval mortality revealed that M. anisopliae (1.15% WP), B. thuringiensis (0.5% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) registered higher effectiveness (lower LC₅₀ value) at 25(sup>o</sup> C whereas, increase in temperature led to declined efficacy of biorationals; whereas, use of entomopathogenic fungi, B. bassiana (1.15% WP) was most effective at 30^o C and revealed lower effectiveness (higher LC₅₀ value) at 25^o and 35^o C temperatures. Data on the influence of temperature on toxicity of biorationals to P. xylostella on the basis of adult emergence revealed lowest LC₅₀ value for B. thuringiensis (0.5% WP) at 25^o C and the efficacy decreased with increase in the temperature, whereas, M. anisopliae (1.15% WP), B. bassiana (1.15% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) were most effective at 30^o C and the higher LC₅₀ value were evident at temperature above 30^o C, indicating the reduced efficacy of biorationals with increase in temperature beyond 30^o C or preference for lower temperature regimes under laboratory conditions.

Keywords

Biorationals, Diamondback moth, LC₅₀, temperature regimes.

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P. N. MANE ¹, M. P. MOHARIL ², N. S. SATPUTE ³, D. B. UNDIRWADE ³

Affiliations
1 Oilseeds Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Krishinagar, Akola – 444 104, Maharashtra, IN
2 Biotechnology Centre, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Krishinagar, Akola – 444 104, Maharashtra, IN
3 Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Krishinagar, Akola – 444 104, Maharashtra, IN

Abstract

Experiment was conducted at Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola during 2011- 2013 to see the effect of natural sunlight (UV) on HearNPV formulation. Experiment was laid out in Completely Randomized Block Design replicated thrice. The aqueous and dry form of HearNPV formulations were prepared by using additives viz. Tinopal an optical brightener and silver nano particle and evaluated their capability to protect NPVs from Ultra Violet rays. HearNPV formulation were sprayed uniformly on the potted chickpea plants during noon hours. Twigs were collected at thirty minutes, One hour, One and half hours and two hours after spraying and kept in petriplates. The laboratory reared second instar larvae of H. armigera were released on each treated twig. Larval mortality was recorded at 4, 7 and 10 days after treatment. An aqueous form of HearNPV formulation, HearNPV + Silver Nano Particles @ 8 µl /ml of HearNPV + Tinopal 1% + Sucrose 1% (T1) recorded 83.04% larval mortality at ten days after spraying which was at par with HearNPV alone unirradiated (84.21 % larval mortality) when exposed to sunlight up to one hour. Among the lyophilized form of formulations, HearNPV + Silver Nano Particles @ 8µl/ml of HearNPV + Tinopal 1% + Sucrose1% (T6) when exposed to sunlight up to one hour recorded 84.80% larval mortality at ten days after spraying which was at par with which was at par with HearNPV alone unirradiated (T12) (85.38% larval mortality) and higher than HearNPV alone irradiated. Both aqueous and lyophilized form of HearNPV showed decreasing larval mortality as compared to HearNPV alone unirradiated when exposed to sunlight up to one and half and two hours. Lyophilized HearNPV formulations recorded higher larval mortality as compared to aqueous form of HearNPV formulations at all sunlight exposure period.

Keywords

HearNPV formulations, Helicoverpa armigera, UV Rays.

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Bhagyashri Kamble ¹, S. K. Bhalkare ¹, Poonam Deshmukh ¹, D. B. Undirwade ¹

Affiliations
1 Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola 444104, Maharashtra, IN

Abstract

Studies were conducted to evaluate efficacy of insect growth regulators against leafhoppers Amrasca (Sundapteryx) biguttula, and whiteflies Bemisia tabaci (Gennadius) on cotton at the Department of Entomology, Dr. PDKV, Akola during 2019-2020. Overall four sprays were given out and the data obtained revealed that buprofezin 25%SC was found promising against leafhopper population. However, this treatment was found statistically similar to pyriproxyfen 10%EC and buprofezin 25%SC + NSKE 5%. The application of pyriproxyfen 10%EC, pyriproxyfen 10%EC + NSKE 5% and buprofezin 25%SC proved statistically equal in reducing whiteflies population. The treatments were found to be safe to the natural enemy activity. The highest seed cotton yield was obtained in the plots sprayed with buprofezin 25%SC (13.40 q/ha).

Keywords

Cotton, Amrasca (sundapteryx) biguttula, Bemisia tabaci, insect growth regulators, lady bird beetle, chrysopids, natural enemies

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Poonam Deshmukh ¹, P. N. Mane ², D. B. Undirwade ³, V. U. Sonalkar ⁴

Affiliations
1 Department of Entomology, Dr Panjabrao Deshmukh Krishi Vidyapeeth, Akola 444104
2 Oilseed Research Unit, Dr Panjabrao Deshmukh Krishi Vidyapeeth, Akola 444104, IN
3 Department of Entomology, Dr Panjabrao Deshmukh Krishi Vidyapeeth, Akola 444104, IN
4 Sorghum Research Unit, Dr Panjabrao Deshmukh Krishi Vidyapeeth, Akola 444104, IN

Abstract

Life stages of groundnut bruchid Caryedon serratus was studied in the laboratory of Seed Technology Research Unit, Dr Panjabrao Deshmukh Krishi Vidyapeeth, Akola during 2019-20. The bruchid was multiplied under laboratory conditions at 25± 2°C and 70% RH on groundnut pods. Egg, grub and pupal periods, adult longevity and total life period were examined. The mean life period of male groundnut bruchid was 69 days and for female it was 76.50 days. The grub (damaging stage) period lasted for 33 days.

Keywords

Arachis hypogaea, Caryedon serratus, coleoptera, incubation period, grub, life stages, pupal period, storage, total life period.

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