玉米灰斑病两种施药防治方法的研究

 玉米灰斑病在云南冷凉山区严重发生。本研究在玉米大喇叭口期，每667m2取10kg砂土分别与200g 的70%丙森锌WP，20g的43%戊唑醇SC，22g的25%苯醚甲环唑WP和100g的40%丙环唑ME 混合均匀后，施入喇叭口中，在收获前7d的防治效果分别达49.21%，54.88%，44.88%，7532%，挽回产量28.70%，23.08%，47.48%，76.71%。以各药剂同样剂量分别兑水50kg后叶面喷雾，且间隔10d再喷施1次，与药土法同期调查的防治效果分别达48.02%，50.75%，41.03%，72.55%，挽回产量16.26%，9.40%，16.66%，35.51%。药土法用药少，施药方便，效果好，可在山区推广应用。

Control of Maize Gray Leaf Spot by Two Applications with Fungicides

Maize gray leaf spot (MGLS) is very severe in the mountainous areas of Yunnan Province. At the pre tasselling stage, when 200gof 70% propineb WP, 20g of 43% tebuconazole SC,22gof 25% difenoconazole WP and 200g of 40% propiconazol ME mixed with 10kg of sandy soil, respectively, per 667m2were applied into central leaves of maize, the control effects of MGLS reached 49.21%, 54.88%, 44.88% and 75.32% at the 7 day before harvest and the yields retrieved were 28.70%, 23.08%, 47.48% and 76.71%, respectively. When the same amount of fungicides mixed with 50kg of water was sprayed onto leaves per 667m2 twice every 10 days，the control effects were 48.02%, 50.75%, 41.03% and 72.55% and the yields retrieved were 16.26%, 9.40%, 16.66% and 35.51%, respectively. The fungicide soil mixture used less fungicide, was applied more easily and had better control effect than fungicide spray, and thus was extendable in the mountainous area.