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我们对本刊今年第一期发表的“高浓度乐果药液喷治高梁蚜的效果好”一文谈点看法: 根据我们的防治实践证明,高浓度的乐果药液喷治高粱蚜虫,虽然杀虫率高,但对高梁则有较严重药害。 1974年我们在本所试验地十几亩“191”高粱抽穗初期发生蚜虫时,用40％乐果乳剂400倍液,也是用一般步行速度喷在植株中、下部叶片上,一趟喷四行,每亩喷药液80—100斤,结果蚜虫虽治住了,但高梁却表现出严重的药害现象。因此,我们认为“高浓度乐果药液喷治高粱蚜的效果好”,值得进一步探讨。
Our article on the first issue of this year, “high concentration of dimethoate spray effect of sorghum aphid good effect,” a talk on the point of view: According to our prevention and control practices have proved that high concentrations of dimethoate solution spray sorghum aphids, though Insecticidal rate is high, but sorghum is more serious injury. In 1974, we experimented in more than a dozen acres of “191” sorghum early aphids, with 40% dimethoate 400 times the solution, but also with the general speed of the spray in the plant, the lower leaves, a row of four spray trip , 80-100 pounds per mu spray liquid, although the result of aphids cured, but sorghum has shown serious injury phenomenon. Therefore, we think "high concentrations of dimethoate spray good effect of sorghum aphid, it is worth further study.