Summary
The cankerous disease of guava (Psidium guajava L.) exhibiting characteristic spots and malformations is prevalent in Mysore. It is associated with two fungiColletotrichum psidii Curzi andPestalotia psidii Pat.
Colletotrichum psidii developed a perithecial stage in pure culture for the first time in India. The perithecia are globular, dark coloured, aparaphysate. Asci are numerous, hyaline and the ascospores are 8 in number, unicellular and granular. This stage corresponds closely toGlomerella psidii (Del.) Sheld.
Colletotrichum psidii infected the fruits of apple, chilly, lemon, papaya, plantain, mango and tomato and not brinjal and French bean.Pestalotia psidii did not infect any of these hosts. Both the fungi infected the injured fruits and leaves of guava.
Colletotrichum psidii is a general parasite whilePestalotia psidii is specialised to guava.
Three or four sprayings with 1% Bordeaux mixture or with lime sulphur solution 1:25 done at intervals of 15 days at an early stage of infection controls the spread of the fungi.
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Communicated by Prof. L. Narayana Rao,f.a.sc.
The author is thankful to Sri. S. V. Venkatarayan, Plant Pathologist, for his interest and helpful criticism in the course of this work.
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Venkatakrishniah, N.S. Glomerella psidii (Del.) sheld. andPestalotia psidii Pat. Associated with a cankerous disease of guava. Proc. Indian Acad. Sci. 36, 129–134 (1952). https://doi.org/10.1007/BF03050440
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DOI: https://doi.org/10.1007/BF03050440