scholarly journals Assessment of Yield Loss of Mustard Due to Alternaria Leaf Blight in Gangetic Plains of West Bengal

2017 ◽  
Vol 70 (3) ◽  
Author(s):  
Sunita Mahapatra ◽  
Srikanta Das
Keyword(s):  
Yield Loss ◽  
West Bengal ◽  
Leaf Blight ◽  
Gangetic Plains ◽  
Alternaria Leaf Blight

Farmers’ knowledge, perceptions and practices in jute insect pest management and cultural strategy in the upper Gangetic plains of West Bengal, India

2017 ◽  
Vol 51 (04) ◽  
Author(s):  
Abdul Sadat ◽  
Kaushik Chakraborty
Keyword(s):  
Pest Management ◽  
Management Strategy ◽  
Yield Loss ◽  
West Bengal ◽  
Insect Pests ◽  
Insect Pest ◽  
Control Cost ◽  
Gangetic Plains ◽  
And Control ◽  
Damage Symptoms

A survey on jute farmers’ knowledge, perceptions and practices (KPP) in pest management strategy was conducted during jute cultivation season of 2015 in the upper Gangetic plains of Uttar Dinajpur District, West Bengal, India. Detection and control of insect pests was largely based on damage symptoms of host plant. Damage caused by jute semilooper (Anomis sabulifera) was often mistakenly attributed to other leaf feeding caterpillars. Nearly all of the farmers applied insecticides (99%) without target specific use with an average 1.5 per season which may increase up to two to three spray per week. Pyrethroids were mostly accepted insecticide (67%), followed by organophosphates (33%) without knowing its toxic effect on environment. Farmers’ estimated yield loss due to insect pests was significantly correlated to estimated pest control cost. Due to pesticide sellers’ recommendations, farmer’s insecticidal ‘spray load’ significantly increased in every year, whereas the adopted number of insecticidal increased with advice following the guidance of extension staff and advertisement. Expenditure for pesticides was in concurrent with that of fertilizers. Only 10% of participating farmers knew about natural enemies, all of which were predators. Investigation is needed to evaluate whether significant savings can be obtained given a more judicious use of pesticides.

scholarly journals Redroot pigweed as a host for Alternaria alternata – the causal agent of Alternaria leaf blight in potato

2015 ◽  
Vol 102 (1) ◽  
pp. 115-118 ◽  
Author(s):  
Stanisław Mazur ◽  
Halina Kurzawińska ◽  
Małgorzata Nadziakiewicz ◽  
Jacek Nawrocki
Keyword(s):  
Alternaria Alternata ◽  
Leaf Blight ◽  
Causal Agent ◽  
Redroot Pigweed ◽  
Alternaria Leaf Blight

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 Influence of weather parameters on alternaria leaf blight severity of makhana under the agro-climate of Koshi region of Bihar

2021 ◽  
Vol 23 (1) ◽  
pp. 54-59
Author(s):  
SANTOSH KUMAR ◽  
MD. NADEEM AKHTAR ◽  
SANTOSH KUMAR ◽  
MAHESH KUMAR ◽  
TRIBHUWAN KUMAR
Keyword(s):  
High Temperature ◽  
Relative Humidity ◽  
Disease Severity ◽  
Infection Process ◽  
Leaf Blight ◽  
Alternaria Leaf Blight ◽  
Weather Parameters ◽  
Maximum Temperatures ◽  
Blight Disease ◽  
Cent Disease

Weather parameters play a pivotal role in the infection process and spread of pathogen. It also influences the expression of susceptibility/resistance of the host plant during post-infection phases. Therefore, an experiment was conducted for two consecutive cropping seasons (2018 &2019) to study the influence of weather parameters such as temperature, humidity, rainfall and wind direction on the emergence of alternaria leaf blight of makhana in Koshi region of Bihar. Maximum per cent disease severity of alternarialeaf blightwas observed during the peak monsoon months (June to August). Highest disease severity of leaf blight (14.80% & 15.7%) was observed in the mid June during crop season, 2018 and 2019. High temperature (36.9oC & 38.1oC), and relative humidity (94% & 96.4%) of both the year 2018 and 2019 were found correlated with higher severity to alternaria leaf blight. Similarly average HTR values (3.1) were also found correlated with the average high temperature and relative humidity of both years (2018 and 2019) in terms of severity of leaf blight disease. Maximum temperatures, relative humidity and rainfall exhibited strong positive linear relationship and influenced the occurrence of alternaria leaf blight disease significantly. We also developed a geo-phytopathological model for the prediction of alternaria leaf blight disease of makhana on the basis of congenial mean temperature and relative humidity.

scholarly journals Management of Alternaria leaf blight in tomato plants by mentha essential oil

2020 ◽  
Vol 56 (No. 3) ◽  
pp. 191-196
Author(s):  
Kahkashan Perveen ◽  
Najat A. Bokhari
Keyword(s):  
Antifungal Activity ◽  
Essential Oil ◽  
Mycelial Growth ◽  
Leaf Blight ◽  
In Vitro Test ◽  
Tomato Plants ◽  
Conidia Germination ◽  
Alternaria Leaf Blight

The essential oil obtained by the hydro-distillation of the leaves of Mentha arvensis Linnaeus was evaluated for its antifungal activity against the causal agent of the Alternaria blight of tomatoes, i.e., Alternaria alternata (Fries) Keissler. The antifungal activity of the mentha essential oil was assessed both in vitro and in vivo. The chemical composition of the mentha oil was also identified by GCMS analysis. The in vitro test revealed that the maximum inhibition in the mycelial growth (93.6%) and conidia germination (90.6%) was at the highest concentration (40 µL/mL), furthermore, it was found that the inhibition of the mycelial growth and conidia germination was dose dependent. The in vivo test proved that the application of the mentha essential oil (40 µL/mL) significantly increased the plant height (84.6%), fresh weight (81.5%) and dry weight (80.0%) when compared to the untreated tomato plants. The disease incidence was 3.5 in the untreated plants, while it was 0.93 for the mentha essential oil treated plants and was 0.08 in the carbendazim treated plants. The GC-MS analysis of the mentha essential oil identified 18 compounds in total, among which the percentage of menthol was the highest (69.2%). The mentha essential oil was successful in managing the Alternaria leaf blight in the tomato plants. Therefore, it can be explored further for the development of a natural fungicide.

Sign in / Sign up

Export Citation Format

Share Document