Evaluation of mungbean lines for resistance to Cercospora leaves spot and powdery mildew (Erysiphe polygoni) diseases in the green house

Abstract

Mungbean is an important food crop, it is a source of carbohydrates, protein and B vitamine. Therefore the production must be increased. In increasing the production of mungbean, there are several constrains including disease infection. Leaf spot and powdery mildew are the main diseases on mungbean. Planting the resistant varieties to leaf spot / powdery mildew is an effective, easy, and inexpensive way. The aim of research is to get some resistant mungbean lines against leaf spot and powdery mildew disease. The research was conducted in the greenhouse of the Indonesian Legumes and Tuber Crops Research Institute, from May to September 2019. Evaluation of the resistance of mungbean lines to leaf spot and powdery mildew was carried out consecutively. The material tested was 20 mungbean breeding lines from the breeding section, with one resistant variety and one susceptible variety as a check. Inoculation was done by spraying the suspension of Cercospora cruenta spores of leaf spot, or Erysiphe polygoni spores of powdery mildew, with a density of 104 spores / ml in the afternoon. Observation of the intensity of leaf spot or powdery mildew disease is carried out three times, starting at one week after the first symptoms appeared. The results showed that out of 20 mungbean lines tested, there were no line that were resistant, 7 lines were moderately resistant and 13 lines were moderately susceptible to leaf spot disease. Out of 20 lines of mungbeans tested, 8 lines were resistant and 12 lines were moderately resistant to powdery mildew.