Impacts of Integrated Nutrient Management on Epidemiology, Seed Yield and Severity of Alternaria blight Disease in Indian Mustard (Brassica juncea L.)

Abstract

The field studies were conducted at the research farm, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal, India during rabi seasons of 2017–18 and 2018–19. The objective of the research was to establish a relationship between disease severity of Alternaria blight with epidemiological factors in Indian mustard under Integrated Nutrient Management. Severity of disease in the specified time intervals was measured under 10 different nutrient management treatments combinations. Results showed that the highest intensity of Alternaria blight was observed with a mean maximum temperature of 19.3 to 24.4°C, mean minimum temperature of 7.6 to 14.1°C, average temperature of 13.5 to 19.3°C and an average relative humidity of more than 70%. The nutrient management in different combinations resulted different disease severity on leaves and pods and with increase in the age of the plant, significant increase in disease severity was observed. Maximum increase in disease severity was observed on 95 days after sowing (DAS) (44.77%) followed by 80 DAS (38.99%) and 65 DAS (32.99%) irrespective of their different treatments. Minimum disease severity was observed (13.83%) when the plots were treated with Azotobacter @ 250 g kg-1 seed, Phosphobacteria @ 250 g kg-1 seed along with FYM @ 7.5 t ha-1. Empirical relationship was established between different weather factors and Alternaria blight under different nutrient management practices which will be useful to forecast the first appearance of the disease accurately.

Epidemiological study of Alternaria blight of cabbage in Jorhat district of Assam, India

“…The severity of Alternaria blight rises with an average temperature between 13.5°C and 19.3°C and the disease intensity gradually increases with the days after sowing. This occurrence might be attributed to the delayed sowing resulting in the plant's vulnerable growth stage coinciding with the warm temperatures and high humidity as mentioned by Mahapatra et al (2022).…”

Performance Evaluation of Ginger Genotypes on their Yield and Nutrient Uptake under the Coastal Karnataka, India

“…Like every alternative plant, ginger needs the proper type of nutrients to excel in its growth and yield. Major nutrient elements are the source for plant growth and development (Kaur et al, 2020) and are associated with reproductive growth (Kaur et al, 2020), particularly under humid atmospheric condition wherever rainfall is high and nutrient reserves are moderate to low due to natural actions like erosion effects and leaching losses (Faroque et al, 2020;Mahapatra et al, 2022). A common phenomenon rather than an exception, like every plants, ginger crop also need optimum nutrients to excel in its growth, yield and yield attributing characters.…”

Evaluation of Fungicides, Botanicals and Biocontrol Agents for Management of Southern Leaf Blight of Maize (Bipolaris maydis)with Effective Benefit Cost Ratio

“…There is an urgent need to develop integrated disease management practices with the emphasis on biological control and use of botanical extracts Due to the non-availability of durable sources of resistance to the diseases, controls by chemical and biological means are important to avoid crop losses. Several workers developed the integrated disease management the crops like pulses (Marak et al, 2020) wheat (Devi et al, 2021), Mustard (Mahapatra et al, 2022). But on maize there was little information in this aspect.…”