Description :

A full account is given in semi popular terms of a collar and stem canker of pigeon pea cajanus indtcut in trinidad the primary symptoms are the formation of grey scutiform dark edged lesions averaging 5 cm long on the stem and branches many of the lesions turn dark brown and at the collar they generally change into large deep cankers with a verrucose carbonaceous surface. A sepcies of physalospora imperial college of tropical agriculture a full account is given in semi popular terms of a collar and stem canker of pigeon pea cajanus indtcut in trinidad the primary symptoms are the formation of grey scutiform dark edged lesions averaging 5 cm long on the stem and. Collar and stem canker of cajanus indicus pigeon pea caused by a species of physalospora memoirs of the imperial collegeof tropical agriculture trinidad mycological series 14 pp pennycook s r samuels g j 1985. In the west indies a collar rot and stem canker are serious especially when pigeon peas are grown as a perennial crop the causal organism is reported to be physalospora cajanae but it is similar to the disease that has also been ascribed to diplodia cajani and phoma cajani rust uredo cajani is also reported to be troublesome. A new bacterial disease of pigeon pea was first observed at julgaon and anand bombay in september 1949 in studies at the agricultural college poona where ideal conditions for the pathogen were provided circular watersoaked spots 05 mm in diameter were formed on the leaves after an incubation period of seven days as they expand the lesions become quadrilateral 1 mm and are