Aly,, A., Youssef, R., EI-Shazley, A., Omar, M. (2006). EFFECT OF SOME ENVIRONMENTAL FACTORS ON THE INCIDENCE OF CHARCOAL ROT OF COTTON CAUSED BY Macrophomina phaseolina. Journal of Plant Production, 31(1), 225-240. doi: 10.21608/jpp.2006.235700
A. A. Aly,; R. M. Youssef; A. M.M. EI-Shazley; M. R. Omar. "EFFECT OF SOME ENVIRONMENTAL FACTORS ON THE INCIDENCE OF CHARCOAL ROT OF COTTON CAUSED BY Macrophomina phaseolina". Journal of Plant Production, 31, 1, 2006, 225-240. doi: 10.21608/jpp.2006.235700
Aly,, A., Youssef, R., EI-Shazley, A., Omar, M. (2006). 'EFFECT OF SOME ENVIRONMENTAL FACTORS ON THE INCIDENCE OF CHARCOAL ROT OF COTTON CAUSED BY Macrophomina phaseolina', Journal of Plant Production, 31(1), pp. 225-240. doi: 10.21608/jpp.2006.235700
Aly,, A., Youssef, R., EI-Shazley, A., Omar, M. EFFECT OF SOME ENVIRONMENTAL FACTORS ON THE INCIDENCE OF CHARCOAL ROT OF COTTON CAUSED BY Macrophomina phaseolina. Journal of Plant Production, 2006; 31(1): 225-240. doi: 10.21608/jpp.2006.235700
EFFECT OF SOME ENVIRONMENTAL FACTORS ON THE INCIDENCE OF CHARCOAL ROT OF COTTON CAUSED BY Macrophomina phaseolina
1Plant Pathology Res. Institute, Agricultural, Res. Center, Giza, Egypt.
2Dept. of Agric. Botany, Faculty of Agric., AI-Azhar Univ., Cairo, Egypt.
Abstract
A greenhouse study was carried out to evaluate the effects of temperature, soil moisture, soil texture, fertilization, and intercropping on susceptibility of the Egyptian cotton cultivar Giza 75 to Macrophomina phaseo/ina. The obtained results revealed that the optimum temperature of pathogenicity was somewhere between 24.5±1 .50C to 38.0±.2.0oC. The results were inconclusive in determining the relationship between soil moisture content and susceptibility of cotton to M. phaseolina. The discrepancy in the results may be attributed to the fact that the effect of soil moisture was obscured by other environmental factors interacting with soil moisture. The results suggest that cotton is more susceptible to M. phaseo/ina in clay soil than in sandy clay soil. Nineteen fertilizer treatments were evaluated as to their effects on susceptibility of cotton to M. phaseolina. Of these treatments, six were effective in reducing the development of M. phaseo/ina lesions on tap root. However, of the six treatments, the combination of calcium nitrate, potassium sulphate, and calcium superphosphate was the best for two reasons. First, this combination reduced the development of M. phaseolina lesions on tap root by 71.86%. Second, this combination was nutritiously balanced because it provided cotton with NPK. Although, other treatments were as effective as this combination in reducing the diseases, they were nutritiously unbalanced. Intercropping onion (Giza 6) and Chinese garlic with cotton significantly suppressed the advancement of M. phaseolina lesions on cotton stem by 80.59% and 83.01 %, respectively.
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