Annotated Host List of Uganda Parasitic Fungi and Plant Diseases—Part III.

Abstract

These two further instalments of the author's list of parasitic fungi and plant diseases so far recorded in Uganda are on the same lines as the first [R.A.M., xvi, p. 550], and include hosts belonging to 37 families. Armillaria mellea is stated to cause the most important disease of tea in Uganda [ibid., viii, p. 202]. Cotton wilt (Verticillium albo-atrum) [ibid., xv, p. 150; xvi, p. 455] is now known from most cotton areas south of Lakes Albert and Kioga and is increasing every year. The fungus is distributed all over Uganda in seed obtained from diseased plants, and under present conditions dissemination by this means cannot be prevented. It is probable that V. albo-atrum is locally the chief cause of cotton wilt. The fungus was recently discovered attacking cassava at Bukalasa. Mycosphaerella areola, the ascigerous stage of Cercosporella gossypii (syn. Ramularia areola] [ibid., xiv, p. 629] was recorded in its ascigerous stage on cotton. Gibberella fujikuroi, a common saprophyte on dead cotton plants, causes a disease of cotton seedlings simulating sore shin. Cladosporium album [Erostrotheca multiformis: ibid., xvi, p. 322] is recorded on beans (Phaseolus) (on which it causes little damage) and peas.