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The effect of time of application of nitrogenous fertilizer on powdery mildew of winter wheat



The effect of time of application of nitrogenous fertilizer on powdery mildew of winter wheat



Ann Appl Biol 41(3): 381-392



Applying nitrogenous fertilizer (N) to wheat plants of different ages affected the incidence of powdery mildew, Ervsiphe graminis. differently. When N was applied before the flag leaf had emerged, the infection-index (no. of pustules per 100 sq. cm of leaf blade) increased to a maximum and then declined. If N was applied after the flag leaf had emerged, the infection-index increased steadily without reaching a peak, and the increased susceptibility was not associated with an increased relative leaf growth rate as when N was applied earlier. The integral of the no. of pustules per unit area with time, and the no. of perithecia on the leaves of the main stem, both increased with increasing delay in the application of N. Plants given N in either April or May had at least 3 times as many pustules as those given N in Jan. The time when N was applied did not affect the date when perithecia appeared. After adding N to N-deficient plants, the already mature leaves which had resisted mildew infection, became susceptible. This change is not associated with changes in the epidermal wall.

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Accession: 013873925

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DOI: 10.1111/j.1744-7348.1954.tb01139.x


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