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我县夏牧场,历年都有不同程度的蝗害,今年个别草场蝗害较为严重。牧场面积大,在防治工作中,虫口密度和发生面积较难勘查;同时,山区地形复杂,又有森林,大面积药剂防治也没有经验。 今年六月,我们随牲畜进山,时西伯利亚蝗已是成虫,会飞会跳,不能用查蝗蝻法勘查虫口密度。经过多次改进,最后用纱布方罩查虫,此较理想。即用木条钉成50厘米见方的框子,高40—50厘米,四角用木棍支撑,上端集中于一点,围上纱布而成。每人拿一个方罩,每走一段路下罩一次,随即数虫口,计算出虫口密度,并分别种类。这种查虫方法,较四人站在四面数虫口准确省事。
Summer pastures in our county, over the years have varying degrees of locusts, grasshoppers this year more serious locusts. Pasture area is large. In the prevention and control work, population density and occurrence area are difficult to survey. At the same time, mountainous terrain is complex and there are forests. There is no experience in prevention and treatment of large area medicaments. In June this year, when we came into the mountains with our livestock, the Siberian locust was already an adult, flying and jumping. We could not survey the density of insects with the help of a grasshopper. After many improvements, and finally check the insects with gauze square cover, which is more ideal. Named with a wooden frame into a 50 cm square, 40-50 cm high, four corners with a wooden support, the upper focus on a little, gauze from around. Take a square cover for each person, each time a section of road cover a time, then number of insect population, calculate the density of insect population, and the type. This method of searching for worms is more accurate and easier than standing on the four sides of four insects.