Inheritance of rust resistance in cowpea [Vigna unguiculata (L.) Walp.]

Abstract

Yield levels of cowpea [Vigna unguiculata (L.) Walp.) are generally low because of its relative susceptibility to diseases and pests. Cowpea is attacked by over 35 major diseases caused by viruses, bacteria, fungi and nematodes [1-3). The occurrence, severity and yield loss due to each disease and mixed infections vary from place to place but some diseases occur and cause significant damage across the cowpea growing regions of the world. Cowpea rust (Uromyces vignae Barcl.) an important disease in India especially in Karnataka causes considerable yield loss. The pustules are small, roundish open, powdery and brown coloured. They appear in groups when infection is severe and leaves may wither resulting in considerable damage to the crop. Breeding resistant varieties assumes importance in view of the problems associated with the chemical control measures. For this, knowledge of the inheritance pattern is a prerequisite to chalk out breeding strategies.