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Plant Pathology.

Report. Department of Agriculture, Mauritius 1961 pp. 46-53 pp.;


In drier areas Stemphylium [solani] is more severe than late blight [Phytophthora infestans] in commercial tomato plantings. Cercospora carotae on carrot is a new record. Combined infection by Phyllosticta sp. and Asochyta sp. caused severe fruit rot of cucurbits. P. momordica was identified from a leaf spot of bitter gourd. Leveillula taurica on eggplant and Solanum macro carpum constitute new host records.
One of the most important plant diseases on the island, bacterial wilt (Pseudomonas solanacearum[Ralstonia solanacearum]), was severe on potato and eggplant after flooding, but plots of potatoes which had received amendments of coral sand were not affected. The potato var. King George and the groundnut Cabri show some resistance; Canna was a new host.
Among miscellaneous new records are Stemphylium solani on a number of hosts, Phyllosticta brassicae[Leptosphaeria maculans], Pseudoplea [Sphaerulina] trifolii, and Sclerotinia sclerotiorum on cabbage, Puccinia chrysanthemi [map 117] on chrysanthemum, Phakopsora gossypii on cotton [258], Cercospora grandisaima on dahlia, Alternaria tenuissima on several hosts, including rhubarb, Cochliobolus nodulosus on Eleusine indica, Pleospora calvescens on groundnut, Cercospora bidentis on Helianthus tuberosus, Cercospora nebrina on lucerne, and Cylindrocladium macrosporum on tea.