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Estimation of crop losses due to grey mildew disease of cotton caused by Ramularia areola


, : Estimation of crop losses due to grey mildew disease of cotton caused by Ramularia areola. Indian Phytopathology 45(1): 74-76

During 1986-87 and 1987-88, losses of H-4 cotton due to R. areola were assessed under natural conditions in Akola, Maharashtra, India. Losses in boll bearing, boll size and yield of seed cotton were directly proportional to disease intensity. Heavy defoliation (92-99%), low boll bearing (13-16 bolls/plant), lowest boll wt (2.3-2.8 g/boll) and lowest yield (535.9 kg/ha) were recorded from untreated plots having severe disease intensity (43.1-46.6%).

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Related references

Kodmelwar, R.V., 1976: Effect of grey mildew disease caused by Ramularia areola Atk. on three varieties of cotton (Gossypium arboreum L.). Infection by R. areola [R. gossypii] caused significant losses in yield of the cv. G 1946 due to premature leaf fall, but the effects on Ak 235 and Y-1 were non-significant. The effects of the disease on seed wt. and fibre characteristics are tabu...

Aurangabadkar, J.H.; Shukla, V.N.; Wangikar, P.D., 1981: Reaction of some cotton varieties against grey mildew caused by Ramularia areola. Of 64 Gossypium arboreum varieties artificially infected with R. areola [R. gossypii] in the field, 12 were resistant and 49 tolerant. Most varieties in both groups were from the AKH series.

Mukewar, P.M.; Sheo Raj; Singh, V.V.; Anap, G.R., 1995: Screening of tree cotton (Gossypium arboreum) germplasm to grey mildew caused by Ramularia areola. Of 1489 lines evaluated for reaction to Ramularia areola [R. gossypii] under natural conditions, 24 lines were free of infection. These infection-free lines were further tested by artificial inoculation in the screen-house and in the field during...

Rathaiah, Y., 1974: Studies on grey mildew of cotton caused by Ramularia areola Atk. III. Some factors related to growth and sporulation of the pathogen. Coton et fibres tropicales: 29 (2) 263-268

Rathaiah, Y., 1973: Studies on grey mildew of cotton caused by Ramularia areola Atk. I. Growth and sporulation of the fungus in artificial culture

Rathaiah, Y., 1973: Studies on grey mildew of cotton caused by Ramularia areola Atk. II. In vitro evaluation of some systematic and calssical fungicides. Coton et fibres tropicales: 28 (4) 523-527

Kodmelwar, R.V., 1976: Effect of gray mildew disease caused by ramularia areola on 3 varieties of cotton gossypium arboreum. AK 235, G 1946 and Y-1 cotton varieties were selected for quantitative and qualitative estimates of losses due to gray mildew. The leaf differences in the 3 varieties were highly significant. The mean differences of boll number and yield of seed c...

Shivankar, S.K.; Anvikar, D.G.; Ninawe, B.N., 1995: Detection of physiological races of Ramularia areola Atk. causing grey mildew of cotton. Cross inoculation tests with 4 Gossypium spp. and 4 isolates of R. areola [R. gossypii] failed to establish the presence of different races in the Vidarbha region of Maharashtra.

Lakshmanan, P.; Vidhyasekaran, P., 1990: Resistance of cotton genotypes to grey mildew (Ramularia areola Atk.) in Tamil Nadu, India. In field tests, 1000 collections of cotton germplasm were screened under natural infection conditions for their resistance to R. areola [R. gossypii]. Of these, 166 exhibited high levels of resistance and were tested again under artificial infecti...

Kodmelwar R.V., 1972: Grades for evaluating grey mildew caused by ramularia areola in gossypium arboreum. Indian Journal of Agricultural Sciences 42(10): 913-915