ヒロハセネガ(Polygala senega L.var.latifolia Torrey et Gray)の連作障害

概要

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In order to clarify the cause of growth injury to Polygala senega var. latifolia by continuous cropping and measures for prevention of growth injury, a cultivation experiment in the field was executed. We investigated the effect of the application of fungicide to the field for prevention of growth injury, and the influence of fungicide on the contents of senega saponins. Moreover, the effect of the rice field rotation of crops for prevention of the problem was also examined. The results obtained are as follows : 1 The cause of growth injury to Polygala senega var. latifolia by continuous cropping was Thielaviopsis basicola. 2 In the field with continuous cropping, fungicide was effective for prevention of contraction of Thielaviopsis basicola to some degree. But the yield of roots of Polygala senega var.latifolia was much less than that in the field with new cultivation. 3 The contents of senega saponins tended to decrease with fumigation of soil. 4 Rice field rotation of crops was extremely effective for prevention of disease caused by Thielaviopsis basicola. However, it was insufficient at intervals of one year, and effective at intervals of two years or more.
日本生薬学会の論文
2008-08-20