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经四年的室内、蚕场小区药筛以及大面积生产试验证明,杀螟松药粉对柞蚕毒性低、杀虫效果好、对人畜较安全,比过去使用的6%六六六毒饵防虫效果高,经过防治增产明显。2%乙基一六○五粉剂药杀成虫效果最优,但该药对人、畜、蚕毒性均比杀螟松大。使用杀螟松粉剂防治黑广肩步(虫甲)成虫的有效浓度为2—2.5%,每平方米施药量为20克。如果药粉中有效成份低于2%,杀虫效果亦减低。在辽宁省防治的时期为8月上旬—中旬,于步(虫甲)为害进入较严重之时施药灭虫。被施药的柞蚕场树高需在二尺以上,如果柞墩矮小可行移蚕换树后施药。施药应采用封闭柞墩基部的方法,预先清除树下高秆杂草,施于柞墩基部并向外施出1—1.5尺宽。施药前或药效期过后岀现的少量步(虫甲),考虑其经济效益问题,可不必施药,应采取人工抓虫的方法进行消灭。杀螟松粉剂的缺点①药粉有效成份易在贮藏过程中逐渐分解,因此需使用近年加工生产的粉剂。如果货源不足,亦可用乳剂自行调制为粉剂。②雨淋易损坏药粉层而降低杀虫效果,因此需选择晴天风小之日的下午施药为宜。
After four years of indoor, silkworm farm area drug screening and large-scale production tests showed that fenitrothion powder has low toxicity to Tussah, insecticidal effect is good, more secure for humans and animals than 6% 666 poison bait used in the past high pest control effect After the prevention and treatment increased significantly. 2% Ethyl 1960 powder kill the most effective, but the drug on humans, livestock, silkworm toxicity than fenitrothion large. The effective concentration of fenitroth powder prevention and control black broad shoulders step (worm) adults is 2-2.5%, the dosage per square meter is 20 grams. If the active ingredient in the powder is less than 2%, the pesticidal effect is also reduced. In Liaoning Province, the period of prevention and control is in early August - mid, the step (insects) damage more serious when applied pesticides. Tussah field was applied to the tree height of more than two feet, if the dwarf pod pier can move silkworm tree after the application. The application of pesticides should be based on the method of closing the base of the mound, pre-clearing the tall weed under the tree and applying it to the base of the mound and spreading 1-1.5 feet outside. A small number of steps (pest) that appear before or after the expiration date may not be applied after taking into account the economic benefits, and artificial pests should be eliminated. Disadvantage of fenitrothion powder ① The active ingredient of the powder is easy to be decomposed gradually during the storage process, so the powder that is processed and produced in recent years needs to be used. If the lack of supply, can also use the emulsion to prepare their own powder. ② easy to damage the powder layer of rain and reduce the insecticidal effect, it is necessary to choose the sunny days of small afternoon spraying is appropriate.