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本文研究在松树干上涂刷有持久性的药剂以防治越冬松毛虫的可能性。1947—48年在南京试验及实施防治的结果简述如下: (一)在实验室内使越冬松毛虫爬行越过涂有一市尺宽各种药液的松树干的结果,证明5％ DDT,1％γ666,与5％ 1068的悬液或溶液。在涂药的当天均 有相当高的杀虫效力,惟一周以后γ666与1068完全失效,仅DDT仍保持强大的毒力。DDT水悬液显著较DDT火油、大豆油或丙酮溶液为佳。涂有5％DDT悬液的松树杆曝露田间六星期后,杀死松毛虫能力仍达100％。 (二)据试验的结果,自制的可湿性DDT,内含DDT50％,稀释剂45％,与肥皂5％,尚适宜于防治松毛虫之用。 (三)松毛虫爬行的次数对涂药面积上DDT毒力的影响极微,在二十平方市寸涂有5％ DDT悬液的小面积上,9天之内经过1800头松毛虫爬行后,毒力仍未减小,死亡率尚在90％以上。 (四)夏季松毛虫较越冬松毛虫不易杀死。夏季松毛虫抵抗DDT的能力随龄期而增强。试验中显示如增加药液浓度至含DDT 10—15％,或增加涂药的宽度至2—3市尺,夏季幼虫亦能中毒死亡。故树干涂药法亦可应用在夏季防治上,惟必须在涂药后将松毛虫从树上击落,使其在爬返树冠时接触药剂而死亡。 (五)自然情形下,南京松毛虫在十一月即开始下树越冬,至来年三月初开始活动上树,故采用树干涂药法防治下?
This article studies the possibility of applying permanent agents to pine trunks to control winter winged moths. The results of trials and implementation of control measures in Nanjing from 1947 to 48 are summarized as follows: (1) The results of crawling overwintering pine caterpillars in the laboratory over pine trunks coated with various medicinal solutions of a city square show that 5% DDT, 1 % Γ666, and 5% 1068 suspension or solution. In the coating of the day have a very high insecticidal efficacy, the only week after the γ666 and 1068 completely failed, only DDT still maintain a strong virulence. DDT aqueous suspension was significantly better than DDT oil, soybean oil or acetone solution. Pine trees coated with 5% DDT suspension had a 100% capacity to kill pine caterpillars after being exposed to the field for six weeks. (B) According to the test results, self-made wettable DDT, containing DDT50%, 45% diluent, and soap 5%, is still suitable for the control of pine caterpillars. (C) the number of crawling caterpillars DDT toxicity on the coating area of minimal impact, in 20 square square inch coated with 5% DDT suspension of small area, within 9 days after 1800 moth crawling , Virulence has not yet reduced, the mortality rate is still above 90%. (D) the summer pine caterpillar is not easy to kill than the winter pine caterpillars. The ability of summer pine caterpillars to resist DDT increases with age. Tests showed that if increasing the concentration of the liquid to 10-15% with DDT, or increasing the width of the coating to 2-3 squares, summer larvae can also be poisoned to death. Therefore, trunk application method can also be used in summer prevention and control, but must be coated with pine caterpillars shot down from the tree, making it in contact with the crown when climbing back to death. (E) under natural conditions, Nanjing pine caterpillars began to win the tree in November, the beginning of March early March activities on the tree, so the use of trunk coating method to prevent?