scholarly journals Comparative Assessment of Biocontrol Agents (BGAs) and Chemical Insecticides on the Incidence and Management of Major Insect-Pests in Green Gram (Vigna mungo L.) in West Bengal

2019 ◽  
Vol 8 (07) ◽  
pp. 1578-1587
Author(s):  
Prajna Pati ◽  
Swarnali Battacharyya
Keyword(s):  
West Bengal ◽  
Insect Pests ◽  
Comparative Assessment ◽  
Vigna Mungo ◽  
Biocontrol Agents ◽  
Green Gram

Seasonal Incidence of Pulse Aphid (Aphis craccivora Koch.) and its Natural Enemies on Field Pea (Pisum sativum L.) in Relation to Some Abiotic Factors in Alluvial Zone of West Bengal

2021 ◽  
Author(s):  
S. Pal ◽  
S. Samanta ◽  
A. Banerjee
Keyword(s):  
Relative Humidity ◽  
Pisum Sativum ◽  
Natural Enemies ◽  
West Bengal ◽  
Insect Pests ◽  
Field Pea ◽  
Pest Population ◽  
Pisum Sativum L ◽  
Aphis Craccivora Koch ◽  
Weather Parameters

Background: Field pea, Pisum sativum L. is an important winter-season pulse crop. It is subjected to damage by both field and storage insect pests and approximately 10-15 per cent reduction in yield was reported due to the infestation of different insect pests. Among these, pulse aphid (Aphis craccivora Koch.) affects plant physiology directly by removal of nutrients or indirectly by dispersal of various viral diseases. The present investigation has been aimed to study the seasonal fluctuations of aphids and their natural enemies as well as their correlation. Another objective was to know the effect of various weather parameters on pulse aphids and their natural enemies which ultimately would be helpful to develop a forewarning model.Methods: The field experiment was conducted at the A-B Block Farm of Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal using two varieties of field pea (KPMR 935 and IFPD 122) during rabi seasons of two consecutive years of 2017-18 and 2018-19 following a Randomized Block Design with three replications. After recording the total population of both pests (nymphs and adults) and their natural enemies across the season, the mean population was worked out and used for correlation and regression studies along with the weather parameters. Result: Maximum aphid population was noticed during the peak pod formation stage of the crop irrespective of the varieties. The pest population was very strongly correlated with the incidence of coccinellid and ant population in both test varieties. Among the weather parameters, both maximum and minimum temperature and sunshine hour showed a positive correlation with the pest population and their natural enemies but relative humidity and rainfall showed a negative correlation. Regression studies indicated that temperature and relative humidity were the most influencing factors over the incidence of aphid in both the seasons.

scholarly journals Evaluating radiation interception pattern and RUE of green gram grown in Lower Gangetic Plains and assessing future yield based on RUE

2022 ◽  
Vol 24 (1) ◽  
Author(s):  
SARATHI SAHA ◽  
SAON BANERJEE ◽  
SOUMEN MONDAL ◽  
ASIS MUKHERJEE ◽  
RAJIB NATH ◽  
...  
Keyword(s):  
West Bengal ◽  
Biomass Conversion ◽  
Average Rate ◽  
Green Gram ◽  
Radiation Use Efficiency ◽  
Yield Prediction ◽  
Gangetic Plains ◽  
Use Efficiency ◽  
Change Impact ◽  
Radiation Use

An experiment was conducted in the Lower Gangetic Plains of West Bengal during 2017 and 2018 with three popular green gram varieties of the region (viz. Samrat, PM05 and Meha). Along with studying the variation of PAR components, a radiation use efficiency (RUE) based equation irrespective of varieties was developed and used to estimate the green gram yield for 2040-2090 period under RCP 4.5 and 8.5 scenarios. Field experimental results showed that almost 33.33 to 52.12% higher yield was recorded in 2017 in comparison to 2018. As observed through pooled experimental data of two years, PM05 produced 3 to 4% higher pod and 4 to 15% more biomass than Samrat and Meha with the highest radiation use efficiency (1.786 g MJ-1). Results also depicted that enhanced thermal condition would cause 9 to 15 days of advancement in maturity. Biomass and yield would also decrease gradually from 2040 to 2090 with an average rate of 7.60-11.70% and 10.19-14.17% respectively. The supporting literature confirms that future yield prediction under projected climate based on “radiation to biomass” conversion efficiency can be used successfully as a method to evaluate climate change impact on crop performance.

scholarly journals A bioassay technique to assess the molluscicidal effects of microbes

2009 ◽  
Vol 62 ◽  
pp. 7-11 ◽  
Author(s):  
S.A. Howlett ◽  
G. Burch ◽  
U. Sarathchandra ◽  
N.L. Bell
Keyword(s):  
Insect Pests ◽  
Biocontrol Agents ◽  
Bacterial Strains ◽  
Pastoral Systems ◽  
Significant Damage ◽  
Oat Bran ◽  
Bioassay Technique ◽  
Pathogenic Microbes ◽  
Micro Organisms ◽  
Retail Products

Terrestrial slugs (Order Stylommatophora) can cause significant damage in cropping and pastoral systems Pathogenic microbes have long been shown to have potential as biocontrol agents for insect pests and a number of retail products are available but there is no equivalent product for molluscs A research program is underway to investigate the potential of micro organisms as slug biocontrol agents and this paper describes a bioassay methodology that can be used to assess the molluscicidal properties of bacterial isolates Its feasibility has been demonstrated in laboratory tests against pest slugs of the genus Deroceras Fourteen bacterial strains were screened by feeding them to the slugs in a mix based on oat bran a food that is highly palatable to these molluscs Mortality was assessed 3 and 4 days after introduction of the treated food Two of the bacterial strains tested resulted in significant mortality killing 100 slugs within 4 days

scholarly journals Geo-Spatial Distribution and Comparative Assessment of Brick Kiln Industry: Appraisal on Kulpi Block in Diamond Harbour Sub-Division, South 24 Parganas, West Bengal

2021 ◽  
Vol 9 (9) ◽  
pp. 1028-1036
Author(s):  
Shiladitya Purakayastha
Keyword(s):  
Building Materials ◽  
West Bengal ◽  
Comparative Assessment ◽  
Female Worker ◽  
Comparison Analysis ◽  
Brick Kiln ◽  
Brick Kilns ◽  
Block Based ◽  
Unorganized Sector ◽  
Settlement Growth

Abstract: Brick is one of the most important building materials and the demand of it is continuously rising for high increasing of population and the demand for settlement growth. Brick kilns in India are considered by traditional types of manufacturing and established as a significant industry in the unorganized sector. Percentage of female worker is more than male and in most of the cases total family be involved. Indian brick industry is the second biggest in the world after the China which provides livelihood. Among 9 Blocks of Diamond Harbour Sub-Division, Kulpi is the largest block based on number of brick kiln industry. Total brick kiln of the Sub division is 101. But Kulpi has 44 Brick Kilns (equal to 43.46%) covering an area of 60,000 Bigha or 80.3 Sq. Kms acquiring 25.83 % area of the Block itself. Author has attempted to observe the geo-spatial scenario and analysis of brick kiln industry of Kulpi block. Keywords: Locational Status, Brick Kiln Industry, Distribution, Comparison, Analysis, Kulpi Block

scholarly journals Seasonal Incidence of Insect Pests on Mungbean (Vigna radiata) in Correlation with Meteorological data

2020 ◽  
Author(s):  
L. Gehlot ◽  
A. K. Prajapat
Keyword(s):  
Negative Correlation ◽  
Mung Bean ◽  
Trichoplusia Ni ◽  
Insect Pests ◽  
Meteorological Data ◽  
Harmful Effect ◽  
Green Gram ◽  
Seasonal Incidence ◽  
Positive Correlation ◽  
Bean Crop

Background: Mung bean is important pulse crop in India due to its nutritional value. Its grain contains protein, fat, carbohydrate, vitamin and minerals therefore human uses it in various ways in food. Mung bean crop cultivated in kharif, rabi and summer season in India. Various species of insect pests are infested to mung bean crop and cause very harmful effect to crop and farmer. These pests decrease productivity and quality of mung bean. Methods: Field experiment was carried out for the study of seasonal incidence of insect pests on RMG-62 variety of green gram during kharif season 2019. Mung bean was grown on a plot size of 25 m × 25m with 50 cm row to row and 20 cm plant to plant spacing. Randomly selected 20 plants from weekly interval to record population of insect pests. The population of jassid and whitefly was recorded by counting number of pests on 2 upper, 2 middle and 2 lower leaves of a plant whereas population of aphid was recorded by counting number of aphid on 10 cm twig/plant. Result: The mean population of aphid, jassid and whitefly were recorded. Incidence of aphid started during 33th standard week with 0.9 aphid/10cm twig/plant, jassid and whitefly started during 32th standard week with 0.3 jassid/6 leaves/plant and 2.1 whitefly/6 leaves/plant, respectively. Peak mean population of aphid, jassid and whitefly reached during 36th standard week with 10.2 aphid/10cm twig/plant, 10.1 jassid/6 leaves/plant and 14.1 whitefly/6 leaves/plant, respectively. Simultaneously six species of insect pests also infested green gram, these were Mylabris pustulata, Helicoverpa armigera, Trichoplusia ni., Lampides boeticus, Spoladea recurvalis and Diaphania indica. The population of aphid, jassid and whitefly positively correlated with temperature. Population of aphid and whitefly had positive correlation with humidity, whereas jassid population had positive correlation with minimum humidity and negative correlation with maximum and average humidity. All three pests expressed negative correlation with rainfall.

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