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Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur

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Subject: Entomology × Author: Verma, Vikas × End date: 2019 × Start date: 2010 × Type: Thesis ×
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    ThesisItemOpen Access
    Response of different nitrogen levels and spacings on growth and yield onion (Allium Capa L.) cv. N-53
    (JNKVV, 2014) Verma, Vikas; Bose, U.S.
    ABSTRACT Present research work on “Studies on mass production of Beauveria bassiana ,its efficacy and compatibility with some new generation insecticides against Helicoverpa armigera on chickpea (Cicer arietinum L.)” was carried out in the experimental field of Department of Entomology, Live Stock Farm, Adhartal, JNKVV, Jabalpur (M.P.) during rabi 2012-13. The experiments were conducted with the following objectives: 1. To evaluate some local substrates for mass production of Beauveria bassiana 2. To study the population dynamics of gram pod borer, Helicoverpa armigera on normal sown chickpea. 3.a To evaluate the efficacy and combatibility of Beauveria bassiana with some new generation insecticides against Helicoverpa armigera in feild. 3.b Invitro studies on compatibility of Beauveria bassiana with some new generation insecticides. Among the different substrates evaluated highest conidial count (19.07 × 107 spores/ml) was observed on per media followed by Rajma ( 17.03 × 107 spores/ml). It was seen that the pod borer egg population appeared from 49th SW (02/12/2012 to 08/12/2012) and was available upto the 14th SW (31-03-2014 to 6-04-2014). Pod borer egg population attained its maximum peak (0.75 egg/mrl) during 12th SW (17-03-2014 to 23-03-2014), when maximum and minimum temperature were 34 and 13.4oC, respectively, whereas morning relative humidity and evening relative humidity were 79 and 27%, respectively. It was seen that the pod borer larval population appeared from 50th SW (09/12/2013 to 15/12/2013) and was available upto the 15th SW (07-04-2014 to 13-04-2014). Pod borer larval population attained its maximum peak (2.75 larvae/mrl) during 14th SW (31-03-2014 to 6-04-2014), when maximum and minimum temperature were 37.4 and 18.5oC, respectively, whereas morning relative humidity and evening relative humidity were 55 and 16%, respectively. On the basis of the effectiveness of different treatments against pod borer and the grain yield obtained, it can be said that emamectin benzoate 5 SG, flubendiamide 20 SG and rynaxypyr 20 SC proved to be the most effective treatment, not only in reducing the damage due to pod borer complex but also recorded higher grain yields.(1166.67,1120.37,1035.19 kg /ha ,respectively) The quantity and cost of chickpea grain saved by applying emamectin benzoate 5SG, flibendiamide 20 SC, rynaxypyr 20SC comes to 752.78 kg/ha , 706.4 kg/ha 621.35 kg/ha worth Rs 20641.00 per ha ,Rs 15696.50 per ha and Rs 15694.40 per ha. Taking in account the cost of plant protection inputs, the cost benefit ratio value of sole chemicals and combination treatments were close to each other. ie 1:8.62,1:7.64,1:4.79 for emamectin benzoate ,B..bassiana + emamectin benzoate ,and B..bassiana +rynaxypyr respectively. It means that a farmer likely to get a profit of Rs 8.62, Rs 7.46 and Rs 4.79 after investing n amount of Rs 1/- in plant protection measure by applying emamectin, rynaxypyr and flubendiamide respectively.. The effect of insecticides on the mycelial growth of B.bassiana was conducted invitro .amoung the tested emamectin benzoate 5 SG was found to be most compatible with least inhibition percentage followed by flubendiamide 20SC and rynaxypyr 20SC. .