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Plant pathology.

Waterston, J. M.

Rep. Dep. agric. Bermuda, 1941 1942 pp. 8-9 pp.;

Abstract

The most destructive disease investigated during the period under review [cf. R.A.M., xx, p. 392] was potato blight (Phytophthora [infestans]), which caused heavy losses during the last few days of the year. Leaf ron was prevalent in Bliss Triumph potatoes grown from Long Island seed, up to 40 per cent. infection being recorded compared with only 5 per cei for Nova Scotian material. Black rot of broccoli (Xanthomonas campestris) and tomato fruit spot (X. vesicatoria) were encouraged by the wet weather in December. A Diseomyeete that developed on loquat fruits in the laboratory was identified by H. H. Whetzel as a new species of Lambertella, which has also been collected on Jasminum simplicifolium berries, while a fungus found on fiddlewood (Citharexylum spinosum) may prove to be the same. Botryosphaeria ribis (also in its imperfect Dothiorella stage) occurred in a weakly parasitic form on cassava, the first report of the organism on this host in Bermuda. Another new record for the island was Puccinia secalina on a small experimental planting of rye, an obvious case of seed transmission. New hosts for Sderotima sderotiorum included swedes and Anemone coronaria, while Botrytis cinérea was observed for the first time causing chocolate spot of broad bean.