小麦条锈病最佳防治时期研究

Study on the Best Control Approach on Stripe Rust in Winter Wheat

研究采用人工接种模拟小麦条锈病自然发病状况 ,再进行分期喷药 ,从而得出不同时期喷药对小麦条锈病的防治效果。在本试验条件下的结果表明 :在条锈病发病初期的小麦拔节期和孕穗期用药都能达到较好的防治效果 ,而二者相结合防治效果更佳 ,可比不防治增产 16 7 5 5 % ,并能达到较高的产投比和将对环境污染降到最低程度。另外 ,研究还表明 ,小麦条锈病的过早发生 ,对小麦产量构成因素中的有效穗、穗粒数和千粒重都会产生严重影响 ,依次为 :穗粒数 >千粒重 >有效穗 ,因此 ,对于不抗病的小麦品种 ,应对其条锈病进行全程监控 ,做到早发早治 ,再发再治较好 。

Artificial inoculation and chemical spraying by stages were conducted in experimental plots under field conditions to obtain various control results in order to find out the best spraying period and time in the control of wheat stripe rust with chemical Priabimefon. The experiment was arranged in a random complete block design with 3 replications. The 6 treatments were spraying chemicals at elongation stage, at ear-bearing stage, at elongation stage plus ear-bearing stage, at flowering stage, or at elongation stage plus ear-bearing stage and flowering stage, and the control (spraying no chemical). During the experimental period, the growth stage for different treatments was recorded, the productive spikes, grain number per spike and 1000-grain weight were investigated. Each plot was harvested separately. The result shows that the stripe rust can course heavy lost in yield and yield components, and the order is grain number per spike>1000-grain weight>productive spikes. Spraying chemical at elongation stage plus ear-bearing stage can effectively protect the crop from stripe rust damage, which is the best approach in the experiment. Spraying chemical the center of stripe rust is to control effectively it and to obtain high yield.