Correlation between Brassica juncea L. infestation with alternaria blight and average daily temperature and relative humidity

Abstract

The article presents simple and multiple correlation data, which indicate that the dependence of the prevalence and development of Alternaria blight on Brassica juncea L. on a combination of two indicators (average daily temperature and relative humidity) is positive (direct). The relation between them is strong: the multiple correlation coefficient of the three variables R is 0.95. The coefficient of multiple determination R2 of the effect of average daily temperature and relative humidity on prevalence and development of Alternaria blight on B. juncea is 0.90, i.e. the variation of disease prevalence and development is related to their action by 90 % and by 10 % – to other factors. These analyses data were confirmed by Fisher’s test: the exceedance of the actual Fisher’s criterion over the theoretical value (Fa > F05 and Fa > F01) indicates the significance of the relation between the prevalence and development of Alternaria blight and the combined effect of the average daily temperature and relative humidity at the 5 % and 1 % level.