田间试验结果表明,西草净对稻田水绵有优良防除效果,药效持久,适宜施药时期为水稻移栽15 d后,施用剂量,水绵发生量小于3级时,可选用80%苯噻酰草胺·吡嘧磺隆·西草净WDG 600 g a.i./hm~2或西草净157.5 g a.i./hm~2;当水绵发生量大于3级,可选用西草净202.5~247.5 g a.i./hm~2,毒土法施用,此剂量下对水稻生长安全。
【英文摘要】
Field experiment results indicated that Simetryn have good control efficacy and persistence on Spirogyra communis(Hass.) Kutz. in rice field. The suitable spraying period was 15 days after transplanting. 80% WDG of mefenacet pyrazosulfuron-ethyl simetryn at 600 g a.i./ha and Simetryn at 157.5 g a.i./ha were selected under the third occurrence level of Spirogyra. 202.5-247.5 g a.i./ha toxic clay of Simetryn was selected when occurrence level of Spirogyra was above the third. The dose was safe to rice.
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