No abstract

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT)is collaborating with JSTOR to digitize, preserve and extend access to Taxon.

Summary. Three cucumber mosaic diseases of this country and the causal viruses are described. The first disease, green‐mottle mosaic (cucumber virus 3), and the second, yellow mosaic (cucumber virus 4), are not transmissible to solanaceous plants. Cucumber virus 3, on cucumber, causes a dark green mottle with blistering and distortion of the leaves, but the fruit is not usually marked; while cucumber virus 4 gives rise to a distinct type of leaf‐mottle, yellow to silver‐white in colour, and the fruit may be seriously marked. The third disease, yellow‐mottle mosaic (cucumber virus 1), is characterised by a diffuse yellow mottle of cucumber leaves and fruit and is transmissible to solanaceous plants. Cucumber viruses 3 and 4 are described for the first time. Notes are given on fern leaf of tomato, insect vectors and control measures.

No abstract

No abstract