Vol. 4, Issue 4 (2019)
Effects of chitosan on seed germination, anthracnose control and yield parameters of capsicum (Capsicum annum L.) under field condition
Author(s): RGAS Rajapakse, P Premarathna, JK Kahawatta, Shyamalee Kohombange, ERSP Edirimanna, AK Rathnayake, KRC de Silva, DCKK Dissanayake
Abstract: Anthracnose disease is major constraints to profitable cultivation of Capsicum in Sri Lanka. Currently fungicides are used to control this disease at alarming scale. Some chitosan molecules have been proven to control some plant diseases and simultaneously increase yield of crops. Two type of chitosan compounds i.e. chitosan oligomer and chitosan fungicide were used to study the effects of chitosan formulations on seed germination, anthracnose control and yield parameters of capsicum (Capsicum annum L.) under field conditions. Causal agent of the anthracnose disease of capsicum was identified as Colletotrichum gloeosporioides based on microscopic observation. Results revealed that higher seed germination in oligochitosan (300ppm) treated seeds. Seed treatment by oligochitosan (300ppm) or formulation of oligochitosan and chitosan fungicide mixture (300ppm) and spraying of formulation of oligochitosan and chitosan fungicide mixture (600ppm) or alternative spraying of oligochitosan (300ppm) and chitosan fungicide (600ppm) formulations in two times at nursery stage and six times after transplanting in 7 days intervals reported low anthracnose incidences, higher number of capsicum pods and higher yield similar to conventional treatment i.e. seed treatment by fungicide (Thiram 70WP) solution (1000ppm) and spraying of fungicide (Mancozeb 70WP) at the rate of 2g/l two times at nursery stage and six times after transplanting in 7 days intervals.