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为了探索紫花苜蓿茎叶部常见病害的药剂防治技术,试验采用进口多菌灵、甲基托布津、三唑酮三种不同剂型杀菌剂,分别以400,600,800,1 000,1 200倍液对营养生长期出现病害的紫花苜蓿进行分期分批叶面喷施处理,以清水叶面喷施紫花苜蓿茎叶处理为对照,测定了紫花苜蓿病害发病率、产草量、蛋白质、叶绿素含量。结果表明:进口多菌灵400~600倍液、甲基托布津400~600倍液、三唑酮400~1 000倍液分2次液面药剂喷施对紫花苜蓿茎叶部常见病害具有理想的防治效果,并具有浓度效应;只进行1次叶面药剂喷施对紫花苜蓿病害防治效果不明显。紫花苜蓿采取理想浓度药剂防治后,发病率降低,干草产量明显增加,草品质得到显著改善,与严重发病紫花苜蓿相比蛋白质含量提高6%以上。
In order to explore the technology of preventing and curing the common diseases of alfalfa stem and leaf parts, three kinds of fungicides, carbendazim, thiophanate-methyl and triadimefon were imported into the experiment. The effects of 400, 600, 800, The disease-causing alfalfa was treated with leaf-surface spraying in batches and the stems and leaves of alfalfa treated with fresh water were used as control. The incidence, yield, protein and chlorophyll content of alfalfa were determined. The results showed that it is ideal to import carbendazim 400 ~ 600 times, thiophanate-methyl 400 ~ 600 times and triadimefon 400 ~ 1 000 times 2 times liquid spraying on the common diseases of alfalfa stem and leaf parts Of the control effect, and has a concentration effect; only one leaf spraying agent on the alfalfa disease control effect is not obvious. After alfalfa was treated with the ideal concentration of pesticides, the incidence rate was reduced, the yield of hay increased obviously, the quality of grass was significantly improved, and the protein content of alfalfa increased by more than 6% compared with that of severe alfalfa.