施用碳酸鈣對高粱紋枯病病勢進展之影響

Effects of calcium carbonate on the disease development of sorghum sheath blight caused by Rhizoctonia solani AG-1

謝廷芳(T. F. Hsieh) ； 吳文希(W. S. Wu)

《植物病理學會刊》 21卷3&4期 (2012/12) Pp. 213-220

https://doi.org/10.6649/PPB.201212_21(3_4).0003

摘要

於溫室和田間測試高粱生長期對紋枯病的抗感病性反應，發現高粱在抽穗期對紋枯病的感病性最高，其次是乳熟期和孕穗期，而分蘗期和成熟期對紋枯病較具抗性。於小區塊土池中測試不同碳酸鈣施用量對高粱紋枯病病勢進展的效應，並於高粱抽穗期進行人工接種，結果顯示土壤中施用250 mg/kg碳酸鈣能有效抑制紋枯病的病勢發展，然而施用更多量的鈣肥並不能達到更好的效果。

關鍵字

高粱 ； 生長期 ； 紋枯病 ； 抗感病性 ； 碳酸鈣 ； 抑病

並列摘要

Effects of calcium carbonate on disease development of sorghum sheath blight caused by Rhizoctonia solani AG-1 were evaluated in both greenhouse and field trials. The relationships between growth stages of sorghum and its susceptibility to sheath blight were investigated. Our results revealed that sorghum sheath blight occurred primarily at heading stage and occasionally at booting and milking stages of sorghum. The tillering and mature stages of sorghum plants displayed tolerance to Rhizoctonia solani causing minor sheath blight symptoms. In greenhouse, disease level of sheath blight calculated by the percentage of the lesion lengths on sheath was significantly reduced after soil application of 250 mg/kg CaCO_3. Exogenous application of CaCO_3 at rates greater than 250 mg/kg did not further reduce the disease levels.

並列關鍵字

sorghum ； growth stage ； sheath blight ； susceptibility ； calcium carbonate ； disease suppression