戊唑醇防治小麦赤霉病施药时期及安全性评价

为了明确戊唑醇防治小麦赤霉病的关键施药时期及其安全性,进行了戊唑醇防治小麦赤霉病施用浓度和时期的田间试验。结果表明,25%戊唑醇EC在有效成分150g/hm2和75g/hm2两个施用剂量下对小麦赤霉病的防治效果没有显著差异,对病穗率和病情指数的防治效果分别为83.7%、86.0%和85.1%、88.5%;25%戊唑醇EC在有效成分150g/hm2施用剂量下在齐穗期到灌浆初期喷施对小麦安全,以盛花期施药对小麦赤霉病的防治效果最好,对病穗率和病情指数的防治效果分别为80.6%和84.1%,其次为齐穗期和初花期施药,对病穗率和病情指数的防治效果分别为53.9%、53.3%和54.6%、56.8%,灌浆初期施药的防治效果最差。

Safety evaluation and spraying time of tebuconazole to control wheat head blight

To clarify the key spraying time of tebuconazole for controlling Fusarium head blight and the safety to wheat, application dosage and the spraying time were tested in the field trail. The results showed that there was no significant difference in control effect when applying with dosage of 150 g/hm2 and 75 g/hm2. The control efficacy was 83.7% and 85.1%, respectively, at dosage of 150 g/hm2, and 86.0% and 88.5%, respectively, at dosage of 75 g/hm2. It was safety to spray tebuconazole during wheat full heading to early filling stage, at the dosage of 150 g/hm2. The best control effect was 80.6% and 84.1% on diseased spike rate and disease index when sprayed at full flowering stage. The control efficacy on diseased spike rate and disease index were 53.9%, 53.3% and 54.6%, 56.8% when sprayed at full heading and early flowering stage, while the efficacy was weak when sprayed at early filling stage.