Growth behavior and morphological characters of Colletotrichum lindemuthianum causal agent of anthracnose of bean

Morphology of Colletotrichum lindemuthianum

Abstract

Bean (Phaseolus vulgaris L.) is one of the most important legume crops grown throughout the world, used both as green vegetable and pulse. The crop succumbs to a number of biotic factors including anthracnose of beans that poses a serious threat to its production potential. The first symptom of the disease appears on all plant parts of the bean plant. The symptoms are most visible on leaves and mature pods. At first anthracnose generally appears on the cotyledons and primary leaves of the seedlings, it formed small circular reddish to brown coloured diseased spots. The highest radial growth of the pathogen was recorded on wheat meal medium (5.32 cm) followed by corn meal medium (4.40 cm) and Richard’s Medium (4.04 cm), respectively. The poorest growth was observed in Sabouraud’s Medium (3.19 cm). The mycelium of Colletotrichum lindemuthianum were consist of intracellular, septate, hyaline to pale brown, branched and developed as brown to black lesions mass of hyphae. The conidiophore arise from the culture these were hyaline, septate cylindrical, straight, flag at the base. The conidia are unicellular, hyaline, sickle shaped and non–septate.