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1.松小蠹虫在杭州地区猖獗成災,主要是由于从錢塘江上游远來的松柴,攜带了大量的松小蠹虫幼虫而造成的;因此若能在松柴產地剝掉樹皮后,再行运輸是最有效的防治措施。2.根据初步观察此虫在杭州一年發生一代,新成虫在5月下旬到9月間为害当年生松梢;越冬成虫从3月下旬起离开越冬松梢,蛀進二年生松梢的梢端取食,并蛀入半枯死樹和衰老樹樹干或柴堆樹皮下產卵。3.为歼滅杭州地区松小蠹虫,根据試驗結果我們認为可采取下列几个措施:(1)自錢塘江上游运來的松柴在成虫未羽化前,進行噴藥,用1:100的25％DDT乳剂、50％可湿性DDT或6％可湿性666,每隔20天噴藥1次,以殺死羽化的成虫。(2)冬季1,2月间砍伐衰老松樹,在山区設置餌木誘集成虫產卵,然后集中处理,進行噴藥或燒灼。(3)新成虫的羽化盛期开始时,在松樹上噴射60—100倍的可湿性666液,毒殺为害枝梢的成虫以保护松樹生長。
1. Pine bark beetles rampant in Hangzhou area, mainly due to the far from the Qiantang River upstairs pine, carrying a large number of pine beetle larvae caused; Therefore, if the pine bark in the field after peeling, Transport is the most effective control measures. 2. According to the initial observation of a generation of pests in Hangzhou a year, new adults in late May to September during the damage pine shoots; overwintering adult from late March to leave wintering pine shoots, eroded the tip of two-year-old pine shoot Eat and bite into the dead half-dead tree and aged tree trunks or woodpile bark spawning. In order to annihilate the pine bark beetles in Hangzhou area, according to the test results, we think the following measures can be taken: (1) Pine wood from upstream of the Qiantang River sprayed before the emergence of adults, 25% DDT emulsion, 50% wettable DDT or 6% wettable 666, sprayed once every 20 days to kill emerging adults. (2) Cutting down the aged pine tree in January and February in winter and setting bait wood in the mountainous area to attract adults to lay their eggs and then concentrate on spraying or burning. (3) The emergence of the new adult eclosion peak at the beginning of the spray on the pine 60-100 times the wettability of 666 liquid poisoning kill adult shoots to protect the pine growth.