Effect of Temperature, Fertilizer Level, and Fungicide Application on the Severity of Arrowhead Leaf Spot

在氮磷鉀肥料試驗田，11種肥料用量處理間慈姑葉斑病的發病度存在有差異，以不施肥組的發病最嚴重。當磷－鉀肥用量固定時，氮肥用量80或120kg/ha較不施氮肥組發病為低，差異達顯著。至於氮肥及鉀肥用量固定，磷肥用量0、40、120kg/ha之間的發病度則無差異；或是氮肥及燐肥用量固定，則鉀肥用量0、8、240kg/ha之間的發病度亦無差異。發病度(Y)與溫度(X)的關係，經二次曲線迴歸統計，所得之相關方程式為Y=1.756+0.268X-0.007X^2，r=0.76，迴歸係數顯著；最適發病溫度為15-20 C。護矽得及比芬諾(濃度50ppm)對於慈姑葉斑病友防治效果，且與對照組不噴藥間有顯著差異，(相同濃度下)維利黴素處理的發病情形則與對照組之間沒有差異。

關鍵字

肥料；化學防治；慈姑葉斑病

並列摘要

Disease severity of leaf spot of arrowhead caused by Cylindrocarpon chiayiense was higher in a field applied with less nitrogen fertilizer than with more nitrogen fertilizer. However, the disease severity was not affect by the amount of phosphorus or potassium fertilizer applied. The optimum temperature range for the disease development was 15 to 20 C. In a potted plant trials, flusilazole and pyrifenox applied at 1 ml (a.i.)/20 L of water were effective, while validacin applied at the same rate was not effective in controlling the disease.

並列關鍵字

Cylindrocaipon chiayiense ； fertilizer ； chemical control ； arrowhead leaf spot

國際替代計量

Effect of Temperature, Fertilizer Level, and Fungicide Application on the Severity of Arrowhead Leaf Spot

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