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Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur

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2014 - 20182
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Subject: Entomology × Author: Mandloi, Rishikesh × Start date: 1988 ×
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    ThesisItemOpen Access
    Population Dynamics of Insect Pests on Rice and Screening of its Genotypes Against Sucking Pest Complex with Special Reference to Nilaparvata lugens (Stal.)
    (Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, 2018) Mandloi, Rishikesh; Shukla, Abhishek
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    ThesisItemOpen Access
    Study on seasonal incidence of insect pest complex of tomato (Solanum lycopersicum L.) and their management with phyto extracts
    (JNKVV, 2014) Mandloi, Rishikesh; Pachori, Rajesh
    ABSTRACT The present investigation entitled “Study on seasonal incidence of insect pest complex of tomato (Solanum lycopersicum L.) and their management with phyto extracts” was carried out at Vegetable Research Farm, Department of Horticulture, College of Agriculture, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (M.P.) during the rabi 2012-13. The experiment was laid out in two sets, first set to record the seasonal incidence and second set to test the bio efficacy of phyto extracts. The second set of experiment was laid out in Randomized Block Design (RBD) with three replications and eleven treatments for testing the efficacy of phyto extracts. The treatments included NSKE (2%) and (5%), tobacco extract (2%) and (5%), lantana extract (5%), garlic extract (5%), ginger fresh tuber extract (5%), green chilli extract (5%), ipomoea leaf extract (5%), custard apple leaf extract (5%) and control. During the course of study from October 2012 to March 2013, Aphid (Aphis gossypii Glover), Jassid (Amrasca devastans Ishida), White fly (Bemisia tabaci Genn.), Leaf miner (Liriomyza trifolii Burgess), Thrips (Scirtothrips dorsolis) and Fruit borer (Helicoverpa armigera Hub.) were infesting the tomato crop. A. gossypii and L. trifolii were appeared on the tomato crop on 22nd October 2012, while, B. tabaci were appeared in 5 to 11 November 2012 and peak during 26 Feb. to 4 March 2013. A. devastans, S. dorsolis and H. armigera were another major insect pests of tomato crops and it appeared on 5th, 12th and 26th November 2012, respectively. The peak activity of A. gossypii, A. devastans, L. trifolii, and H. armigera was recorded during 12th to 18th March 2013, 26th Feb. to 4th March 2013, 12th to 18th March 2013, and 19th to 25th March 2013, respectively. While B. tabaci population was highest in the 26th Feb to 4th March 2013. S. dorsolis population is seen from 12th November 2012 to 12th March 2013. The seasonal incidence highest mean 11.66 /6 leaves, 9.26/6 leaves, 11.85/10 cm twig, 45.95 per cent, 2.08/6 leaves and 6.11 larval population/plant, were recorded by A. gossypii, A. devastans, B. tabaci, L. trifolii, S. dorsolis and H. armigera, respectively and considered as pests of tomato. S. dorsolis population was significantly and positive correlation with relative humidity evening (0.456) and fruit borer in rainy days (0.428). On the basis of overall lowest mean percentage of leaf infestation 10.70 per cent of L. trifolii recorded in the plots treated with NSKE (5%) followed by tobacco extract (5%) 11.77 per cent and NSKE (2%) 22.09 per cent. However, treatments, NSKE (5%), tobacco extract (5%) and NSKE (2%) were observed significantly less 2.11, 2.62 and 4.52 flies/10 cm twig B. tabaci population, respectively as compared to rest of the treatments. Treatments, NSKE (5%), tobacco extract (5%) and NSKE (2%) were observed significantly less 1.60, 2.07 and 3.21 A. devastans populations per six leaves, respectively and NSKE (5%) and tobacco extract (5%) were also observed significantly less 2.84 and 3.67 per six leaves A. gossypii population, respectively. The treatments, NSKE (5%) and tobacco extract (5%) were observed significantly less larval population of H. armigera 1.21 and 1.57 larvae/plant, respectively. The average less percentage of fruit damaged (6.71 % and 10.97 %) and less percentage yield loss (20.38 and 23.25 %) were recorded in NSKE (5%) and tobacco extract (5%) treatments and considered the most effective treatments against H. armigera. On the basis of above results, NSKE (5%) and tobacco extract (5%) were most effective treatments against L. trifolii, B. tabaci, A. devastans, A. gossypii and H. armigera. NSKE (2%) (16.99 %) and tobacco extract (2%) (17.84%) were found moderately effective than other treatments in respect of less percentage of damaged fruits. Treatment, NSKE (5%) was recorded significantly highest fruit yield 147.50 q/ha. Followed by tobacco extract (5%) (135.57 q/ha.) than rest of the treatments. On the basis of overall performance and economics of these different phyto extracts, NSKE (5%) and tobacco extract (5%) were most effective treatments against the major insect pests of tomato. NSKE (5%) & tobacco extract (5%) gave highest net return (Rs. 47915 and 42700/ ha.) with cost benefit ratio of 1: 3.70 and 1:3.50, respectively.