Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Storage rot of potato. II. Lesions development in relation to the parasitic species and temperature. Control measures.

Abstract

Tubers were inoculated with fungi, mostly isolated from rotten potatoes, and rots assessed after 1-2 months of incubation at 5-20°C. Fusarium avenaceum, F. solani var. coeruleum, F. sulphureum [Gibberella cyanogena], Phoma exigua var. foveata and Phytophthora megasperma were almost non-pathogenic at 5°. F. sambucinum [G. pulicaris] and its var. coeruleum were most pathogenic at 10-15° and P. exigua var. exigua at 5-10°. P. eupyrena was slightly pathogenic at all temps. tested. Six isolates of F. oxysporum were not pathogenic at 5-10° but greatly differed in pathogenicity at 20°. Macrophomina phaseolina was virulent at 30° only. Preventive measures related to planting, haulm killing, harvesting, conditioning and chemical control are discussed.