Journal of Pure and Applied MicrobiologyVol. 9 No. 4

Effect of Weather Parameters on Development and Progress of late Leaf Spot (Phaeoisariopsis personata) Disease in Groundnut

Anil Pappachan, R. Sarada Jayalakshmi Devi and Shreeshail Sonyal

Department of Plant Pathology, S.V. Agricultural College, Tirupati - 517502, India.

Received on 29 May 2015 and accepted on 09 August 2015

 

ABSTRACT

A field experiment was conducted to evaluate the effect of weather parameters on initiation and progress of late leaf spot (Phaeoisariopsis personata) disease in Groundnut under three different dates of sowing (July first week, July third week and August first week).Correlation and regression analysis showed that weather parameters like minimum temperature and morning relative humidity highly influenced the Initiation and progress of late leaf spot. Minimum temperature showed significant negative correlation while morning relative humidity showed significant positive correlation with the late leaf spot development which indicated that progress of late leaf spot epidemic was favoured by high morning relative humidity (more than 80%) and low temperature. Maximum temperature showed significant negative correlation with disease progress in the two late sown conditions (July third week and August first week) while evening relative humidity showed significant positive correlation only in second date of sowing (July third week sowing). Area Under Disease Progress Curve (AUDPC) increased and both pod yield and haulm yield (kg ha-1) decreased with delay in sowing time

Keywords : Phaeoisariopsis personata, late leaf spot, weather parameters, disease progression.