PJB-2022-31
Impact of environmental factors on development of Alternaria leaf spot disease (Alternaria alternata) of ber (Zizyphus mauritiana Lamk.)
Sajjan Choudhary
Abstract
Ber (Ziziphus mauritiana Lamk.), is known as “King of arid fruits†and ‘Poor man’s apple’ because it proliferates under arid conditions with nutritious fruits and low cost. Alternaria leaf spot caused by Alternaria alternata (Fr.) Keissler is one of the most important diseases under changing climatic conditionsthat causes economical losses. To know the impact of environmental factors (temperature, RH, rainfall) on disease development, study was undertaken for two consecutive years.Maximum and minimum temperature and rainfallwere positively correlated with disease development and played an important role in increasing diseaseintensity.Maximum temperature from 24.8 0C to 37.5 0C with frequent and intermittent light rainsfrom August to October (62.3 – 73.7mm)favoureddisease development. The coefficient of multiple determinations (R2) was 96.80 per cent in 2017 and 95.20 per cent in 2018, which means that 95.20 to 96.80 per cent increase in disease intensity was depend on the meteorological factors.Based on such prevailing environmental conditions during rainy season in a particular area, disease forecasting can be made for the growers to protect the crop by prophylactic sprays of pesticides in time to reduce economical losses. Keywords:Ber, Zizyphus mauritiana, Alternaria leaf spot, environmental factors, disease
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