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[目的]明确引起甘肃省黄芪白粉病的病原菌种类,并筛选出高效低毒的药剂用于田间防治。[方法]通过田间调查和形态学方法进行病原鉴定;选用5种高效低毒的杀菌剂进行田间药效试验。[结果]甘肃省黄芪白粉病病原为真菌界子囊菌门束丝壳属黄芪束丝壳Trichocladia astragali(DC.)Neger。田间药效试验结果表明:供试的5种杀菌剂中75%肟菌酯.戊唑醇WG 0.25 mg/L、10%苯醚甲环唑WG 1.44 mg/L和50%硫磺.三唑酮SC 1.26 mg/L效果较好,间隔8 d连续用药2次,防效达75%以上。[结论]75%肟菌酯.戊唑醇WG、10%苯醚甲环唑WG和50%硫磺.三唑酮SC是防治甘肃省黄芪白粉病的首选药剂,可在生产中交替使用。
[Objective] The research aimed to clearly identify the pathogen of astragalus powdery mildew in Gansu Province and screen out the effective and low toxicity medicaments for field control. [Method] The pathogen was identified by field investigation and morphological method. Five kinds of fungicides with high efficiency and low toxicity were selected for field efficacy test. [Result] The pathogen of astragalus powdery mildew in Gansu Province was Trichocladia astragali (DC.) Neger. The results of the field efficacy test showed that 75% trifloxystrobin, tebuconazole WG 0.25 mg / L, 10% difenoconazole WG 1.44 mg / L and 50% SC 1.26 mg / L better effect, interval 8 d continuous medication 2 times, control effect of more than 75%. [Conclusion] The combination of 75% trifloxystrobin, tebuconazole WG, 10% difenoconazole WG and 50% sulfur triadimefon SC is the first choice for the prevention and cure of astragalus powdery mildew in Gansu Province and can be used alternately in the production.