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Das R.,Pulses and Oilseeds Research Station | Mondal B.,Palli Siksha Bhavana | Mondal P.,Palli Siksha Bhavana | Khatua D.C.,Bidhan Chandra Krishi Viswavidyalaya | Mukherjee N.,Bidhan Chandra Krishi Viswavidyalaya
Journal of Biopesticides | Year: 2014

Citrus canker incited by Xanthomonas axonopodis pv. citri (Hasse) Vauterin et al. is a serious disease of acid lime [Citrus aurantifolia (Christm.) Swingle] all over the world including West Bengal, India. The disease depends much upon its secondary spread through rain splash, mechanical contact in stormy weather and leaf damage by citrus leaf minor (Phyllocnistis citrella Stainton). For controlling citrus canker the usual recommendation includes antibiotics and some agrochemicals in the form of spraying. Little work has been reported on biological management of the disease. An experiment was set up in a farmer’s field (acid lime orchard), Nadia, West Bengal, using an inhibitory strain of Bacillus subtilis (S-12) during 2009-2010. Single spray of aqueous suspension (2.7 x 109 cells/ml) of bacterial cells was spread on 5 batches (6 numbers of plants/batch) of plants keeping 4 batches unsprayed. Per cent Disease Index (PDI) was recorded throughout the year at every month using 0-4 scale from both treated and untreated plants. Initial PDI was also taken before one week of spraying. A single spray of the bacterial suspension during the peak season for disease that is in July has resulted in a satisfactory decline of the disease. A sharp decline of the disease was recorded at 20 days after treatment indicating that the spore forming bacteria might have taken over on the leaf surfaces of the plants. © 2014, JBiopest. All rights reserved.

Sahoo S.K.,Pulses and Oilseeds Research Station | Saha A.,Bidhan Chandra Krishi Viswavidyalaya | Jha S.,Bidhan Chandra Krishi Viswavidyalaya
Journal of Agrometeorology | Year: 2016

The insect-pests infestation in mango leads to severe injury to its’ shoots, flowers and fruits by hopper, leaf cutting weevil, shoot borer, grey weevil and fruit flies. The present investigation was taken up during 2006 and 2007 to study the population dynamics of prevailing five insect-pests of mango in relation to weather parameters. The correlation worked out between various pests and weather parameters of previous week and previous fortnight revealed highly significant correlation in most of the cases. Except shoot borer, which was significantly influenced by rainfall, all the other pests were significantly influenced by temperature related indices. Among all the weather parameters heat sum showed highest degree of correlation with fruit fly population. © 2016, Association of Agrometeorologists. All rights reserved.

Nair N.,Bidhan Chandra Krishi Viswavidyalaya | Tudu B.,Bidhan Chandra Krishi Viswavidyalaya | Debnath M.R.,Bidhan Chandra Krishi Viswavidyalaya | Debnath M.R.,Pulses and Oilseeds Research Station | And 2 more authors.
Journal of Entomological Research | Year: 2011

Effect of Bacillus thuringiensis var kurstaki on 3rd instar larvae of H. infixaria was studied. On 7th day after treatment lowest (50%) and highest (96.43%) mortality were provided by Bt kurstaki @ 0.5 g/lit and 2 g/lit, respectively. On 10th day after treatment Bt kurstaki @ 2 g/lit provided cent percent mortality, whereas, 94.64%, 89.29% and 82.14% mortality were given by Bt kurstaki @ 1.5 g/lit, 1 g/lit and 0.5 g/lit, respectively. Pathogenicity tests were positive. Bioassay study with nuclear polyhedrosis virus on H. infixaria was carried out. The LC50 value of 2.7 × 10 PIB/ml concentration at 9th day termination of experiment was observed against 7 day old larvae. At 11th day the LC50 value was observed to be 8.32 × 104 PIB/ml. Similarly in case of 11 day old larvae higher LC50 value of 7.81 × 105 PIB/ml was recorded at 9th day termination of experiment in comparison to the LC50 value of 1.44 × 105 PIB/ml at 11th day termination of experiment.

Patra D.K.,Zonal Adaptive Research Station | Patra D.K.,Rice Research Station | Biswas A.,Pulses and Oilseeds Research Station | Biswas A.,Rice Research Station
Pestology | Year: 2011

Field experiment was conducted during kharif (wet) season, 2007 to evaluate the relative efficacy of new fungicides against banded leaf and sheath blight disease of maize caused by Rhizoctonia solani f. sp. sasakii. Two sprays of ready-mix compound Flusilazole 12.5% + Carbendazim 25% SE (0.1 %) followed by Trifloxystrobin 25%+Tebuconazole 50% WG (0.04%) were highly effective in reducing banded leaf and sheath blight intensity and improving grain yield over other fungicides.

Patra D.K.,Zonal Adaptive Research Station | Patra D.K.,Rice Research Station | Biswas A.,Pulses and Oilseeds Research Station | Biswas A.,Rice Research Station
Pestology | Year: 2010

Alternaria leaf blight of rapeseed-mustard caused by the fungus Alternaria brassicae (Berk). Sacc. is an economically important disease and occurs regularly during the rabi (dry) crop season in West Bengal with an average loss in yield of about 47%. Field experiments were done to evaluate the relative efficacy of five botanicals (bio-fungicides) viz. Biotos, Wanis, Neemrain, Ecomonas and Garlic clove extract, at different concentrations and one standard check fungicide mancozeb 75% WP. All the bio-fungicides were significantly effective in reducing the disease severity and increased yield. Ecomonas followed by Biotos were the best bio-fungicides in controlling Alternaria blight disease of rapeseed-mustard.

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