Factors affecting the development of Rhizoctonia blight and Sclerotium rot of azolla
1991
Natural, M.P. (Philippines Univ., Los Banos, College, Laguna (Philippines). Dept. of Plant Pathology)
Factors affecting the development of two major diseases of azolla were studied in an attempt to standardize techniques in screening for disease resistance. The rice-rice hull or rice-sawdust mixture were found superior over other media tested for inoculum production. Five grams inoculum incubated for 1-2 weeks and spread over fronds grown in 200 sq.cm trays increased the rate of disease development. However, 59 was considered too severe in screening for resistance since all lines became susceptible to both diseases. Shading (35-50% sunlight), extreme soil pH (pH 3.5 and pH 9) and optimum phosphorus content (20 ppm) favored disease development.
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