湿地稻-鸭复合系统中水稻纹枯病的变化规律

A study on the rice sheath blight's developing rules in rice-duck compounded ecosystem of wetland

为了探明稻田养鸭对水稻纹枯病的发生、发展的影响 ,为稻 -鸭复合系统中水稻纹枯病的防治提供依据 ,笔者在中稻、晚稻田进行了稻田养鸭试验。试验结果表明 ,在中稻田每 6 6 6 .7m2 放养体重 15 0 g左右鸭子 15～ 2 0只 ,能使纹枯病病蔸率减少5 6 .0 % ,病株率减少 5 7.74 % ,同时比用井岗霉素防治的小区病蔸率下降 9.0 % ,病株率下降 15 .2 5 % ,病情指数比空白对照下降2 6 .4 6 ,比施用井岗霉素的施药区减少 0 .95 ;防治效果显著 。

To study and document the occurrences and developmental influence of feeding ducks in rice paddies on rice sheath blight, and to provide the basis of rice sheath blight prevention and treatment in a rice-duck compounded system. Through the accounts and trials of feeding ducks in middle rice and late rice fields by the author, the results indicated that: in every 666.7m^2 middle rice paddy fields, 15～20 ducks weighing about 150 g each were fed, duck usage reduced the ratio by 56.0% in diseased hills of rice sheath blight. The ratio of diseased plants was reduced by 57.74%, decreasing the ratio of diseased hills by 9.0% and the ratio of diseased plants decreased by 15.25%. This was in comparison to disease prevention through the treatment and use of Jinggangmycin. The occurrence of disease decreased by 26.46% as compared to an untreated area, at 0.95. The prevention results with the use of ducks proved remarkably affective and on a whole the damage of sheath blight can be considerably controlled.