Latent wither-tip infection on citrus

Abstract

1. Small pinkish-white fungal areas ofColletotrichmu gloeosporioides Penz. were observed on trunks and main branches of orange plants. In certain localities mosambi plants were also infected. 2. Water shoots and young twigs were always found free from the infection. 3. During summer months the mycelium of the fungus survives in the form of pink coloured stroma in small cracks in the bark of orange or mosambi trees and thus tides over the unfavourable atmosphere condition. 4. Mycelium on the host persists as inter- and intra-cellula parasite in one or two layers of the cortical tissue. 5. The disease could be induced artificially. 6. Measurements of the spores, setae and hyphae are given. 7. The isolated strain of C. gloeosporioides corresponds to strain A, No. 316 of Chaudhari and practically falls within the second group of Baker, Crowdy and MeKee. 8. Acervuli of the pathogen has been observed on dead wood also.