为了准确预报赤松毛虫的发生期,我们于1985年进行了赤松毛虫发育始点温度及有效积温的研究。现将观测结果整理如下。 一、观测方法 (一)越冬后4—8龄幼虫的观测:3月中旬自新泰市土门林场采集幼虫约5000头,在室内检取健壮、发育均一的4龄幼虫2000头,置4—5℃冰箱内贮存备用。自3月24日开始,每隔5天取出50头饲于大(直径13厘米)培养皿内,每皿饲养10头。7龄以后将幼虫饲于中型饲养缸内,至5月9日共饲养10批。每2—3天更换一次新鲜松针,在室内自然变温条件下饲养,每天观测记录一次发育进度,直至化蛹。 In order to accurately predict the occurrence of Dendrolimus punctatus, we conducted a study on the onset temperature and effective accumulated temperature of Dendrolimus spectabilis in 1985. The observations are now organized as follows. I. Observation Methods (I) Observation of 4-8 instar larvae after overwintering: In mid-March, about 5,000 larvae were collected from Tumen Forest Farm in Xintai City, and 2,000 healthy 4th-instar larvae of uniform development were seized indoors. -5 ℃ refrigerator reserve. Beginning March 24, 50 heads are fed every 5 days into large (13 cm diameter) petri dishes, each containing 10 heads. The larvae were housed in medium-sized rearing tanks after the 7th instar, and 10 batches were reared on May 9th. Fresh pine needles are changed every 2-3 days, kept under natural indoor temperature conditions, and daily observation and recording of development progress until pupation.