Open AccessEffect of weather parameters on the development of Alternaria leaf spot and grey mildew in cotton
Author(s) -
S. L. Bhattiprolu,
D. Monga
Publication year - 2018
Publication title -
journal of agrometeorology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 11
eISSN - 2583-2980
pISSN - 0972-1665
DOI - 10.54386/jam.v20i4.573
Subject(s) - alternaria , leaf spot , relative humidity , mildew , wind speed , powdery mildew , sunshine duration , pan evaporation , kharif crop , horticulture , environmental science , agronomy , biology , crop , meteorology , irrigation , geography
The effect of weather factors on the development of alternaria leaf spot and grey mildew in Bt Cotton hybrid Jaadoo BG II was investigated at Regional Agricultural Research Station, Lam, Guntur during kharif 2013-2017. Maximum, minimum temperatures, evening relative humidity, rain fall, number of rainy days and wind speed were negatively correlated and significantly influenced the progress of alternaria leaf spot while number of sunshine hours showed positive significant influence. In case of grey mildew, minimum temperature, evening relative humidity, rain fall, number of rainy days, evaporation and wind speed were negatively correlated and significantly influenced the progress of disease. Multiple regression analysis of pooled data (2013-2016) showed that maximum, minimum temperatures, number of rainy days and wind speed significantly influenced the development of alternaria leaf spot (R2=0.984) where as minimum temperature and evaporation significantly influenced the development of grey mildew (R2=0.976). Validation of these regression equations during 2017-18 indicated the usefulness of these models for prediction of alternaia leaf spot and grey mildew in cotton under given environmental conditions.