Controlling leaf spot of wheat through nutrient management
1998
Hossain, I. (Bangladesh Agricultural Univ. Mymensingh, (Bangladesh). Dept. of Plant Pathology)
Leaf spot of wheat, caused by Bipolaris sorokiniana, is a major problem for wheat production in Bangladesh. During a study on the status of leaf blight of wheat, it appeared that none of the currently cultivated wheat varieties in the country are free from the disease. More than 600 wheat materials of exotic and national origin were screened in the field under natural epiphytotics and artificial inoculation. It was observed that only a few showed resistance to B. sorokiniana but none showed immunity. A study into the effect of B. sorokiniana on wheat yield revealed that the artificial inoculation of plants at the flag leaf stage reduced the number of grains per ear and 1000-grain weight by 7-100 percent and 12-100 percent, respectively, compared with the control. Nutrient elements, especially micro-elements Cu, B, and Mo, were used as an alternate method of leaf spot control with the least possible disturbance of the overall natural soil fertility balance. Cu, B, and Mo, applied either as a foliar spray or to the soil, did not significantly affect leaf blight incidence; however, B application increased grain formation and wheat yields. An in vitro study revealed that B has a strong inhibitory effect on B. sorokiniana.
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