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Gupta R.C.,Plant Pathology | Yadav S.P.,Organic Chemist | Gupta R.P.,National Horticultural Research and Development Foundation
Pestology | Year: 2013

The study was conducted at Research Farm, National Horticultural Research and Development Foundation, Nashik to evaluate the efficacy of commonly recommended pesticides against important foliar diseases of onion. Results revealed that significantly lowest incidence (30%) and intensity (5%) of stemphylium blight was recorded in sprays of mancozeb @ 0.25% at 15 days intervals and mancozeb @ 0.25% at 30 days intervals before harvesting. The highest disease incidence (40%) and intensity (9%) of stemphylium blight was recorded in untreated control. Further, it is evident from the data that significantly highest gross yield (340 q/ha) and marketable yield (326 q/ha) was also recorded in mancozeb @ 0.25% sprayed at 15 days interval. Thrips were effectively managed by systemic insecticides namely deltamethrin @ 0.1% and fipronil @ 0.15% spayed at 15 days intervals. Onion bulbs were analyzed for pesticide residue at our Pesticide Residue Laboratory accredited by NABL. The residue analysis report shows that no residues of all the three pesticides namely mancozeb, deltamethrin and fipronil were detected in onion bulbs received from all treatments after harvest. Source


Singh B.K.,National Horticultural Research and Development Foundation | Gupta R.P.,National Horticultural Research and Development Foundation
Pestology | Year: 2011

Onion thrips {Thrips tabaci L.) is a serious pest of onion crop, which causes economical loss if crop is infested at early stage. The effective check for this pest has so far been mainly through the use of chemical insecticides but continuous use of recommended synthetic pyrithroid develop resistance in thrips which create serious problems for management of thrips. Avoid the problems of pest resistance and environment pollution a field experiment was conducted during Rabi 2006-07, 2007-08 and 2008-09 to compare the effectiveness of three different intercrops in reducing onion thrips damage on onion plant. The three intercrops were maize (Zia maize), tomato (Lycopercicon esculentum) and mustard (Brassica spp.). In both year maize was the least attractive intercrop for onion thrips and tomato was only slightly more attractive. Source


Singh B.K.,National Horticultural Research and Development Foundation | Gupta R.P.,National Horticultural Research and Development Foundation
Pestology | Year: 2011

Different bio-insecticides were evaluated under field condition at Regional Research Station Salaru Karnal (Haryana) for the management of the shoot and fruit borer, Earias vittella (Fabr.) on okra during Kharif season of 2008 and 2009. Spinosad 45 SC @ 0.1% was the most effective in reducing the pest incidence and realized the maximum yield of 84.78 q/ha followed by Bacillus thuringiensis @ 0.1%, Azadirachtin 50000 ppm @ 0.2%, Azadirachtin 10000 ppm @ 0.3%, Azadirachtin 1500 ppm @ 0.7%, Neem Seed Kernel extract @ 0.6% and 0.4% giving fruit yield of 72.55, 67.81, 60.40, 56.40, 52.22 and 50.0q/ha respectively. Highest percent fruit infestation (26.74%) and lowest yield (40.77 q/ha.)were recorded under untreated control. Based on the yield data and the cost of application of six spray of each insecticides the cost benefit ratio was 1 :1.80 in Azadirachtin 10000 ppm @ 0.3% followed by 1:1.23 in Bt. @ 2.0gm/lit. Source


Dubey B.K.,National Horticultural Research and Development Foundation | Singh R.K.,National Horticultural Research and Development Foundation
Indian Journal of Horticulture | Year: 2012

Garlic after harvest get damaged due to weight loss and infestation with different microbes and during storage. The present study was undertaken with the objective of screening 19 superior high yielding genotypes for better storage quality. Genotype G-282 had the highest bulb weight though G-176, G-189, G-324 and G-41 had good bulb size and quality. Genotype G-192 had the minimum PLM (3.67%), while G-200 had minimum storage loss after three month storage (4.5%). Source


Gupta R.C.,National Horticultural Research and Development Foundation | Gupta R.P.,National Horticultural Research and Development Foundation
Indian Journal of Agricultural Sciences | Year: 2014

The experiment was conducted on epidemiological studies of Stemphylium vesicarium (Wallr.) Simmons causing stemphylium blight disease on onion (Allium cepa L.) variety Agrifound Light Red during rabi (winter) season, 2006-07, 2007-08 and 2008-09 at Research Farm, National Horticultural Research and Development Foundation, Nashik. Data of field studies revealed that stemphylium blight disease appeared during 5th standard week on onion crop under field conditions in consecutively three years in rabi season. The data shows a progressive increase and maximum percent disease index (PDI) of stemphylium blight was recorded in the 12th (24. 50%), 14th (12. 40% and 15th (13. 15%) standard weeks during rabi season, 2006-07, 2007-08 and 2008-09 respectively. The average temperature ranged from 16. 25°C to 22. 5°C and relative humidity varied in between 85% to 90% was prevailed during 4th and 5th standard week during all the three years. Disease infection rate (r) lowers at the initial stage but increased progressively under congenial weather conditions. The data under disease progress curve (AUDPC) showed towards the disease pressure being higher in the year, 2006-07 followed by 2008-09 and 2007-08. Stepwise multiple regression equation was drawn for the disease prediction based on the data recorded consecutively three years by taking the average of percent disease index (PDI). The four weather parameters, viz. maximum temperature, minimum temperature, maximum RH and minimum RH were contributed in stemphylium blight disease prediction with 95. 95 % precision during rabi season, 2006-07. Similarly, all the four weather parameters contributed for disease prediction with 75. 56% and 77. 33% precision during rabi season, 2007-08 and 2008-09 respectively. Thus the present findings can help for onion growers by alerting for prophylactic spray of fungicides to control the stemphylium blight and boost up the production. Source

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