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1989年8月16日中午,海拔平均1400米的冀北勿乱沟乡发现大批菜粉蝶顺着河道的上空飞向东南,勿乱沟乡是尚义县与坎下地区海河流域4条溪流永胜地河,下井河、土木路河、塞尔基河的汇流点,由此汇流入洋河。各处的菜粉蝶沿着干枯的支流在这里汇集。 为了了解坎上菜粉蝶的动态情况,当天下午4点左右,作者由勿乱沟乘车回尚义县城。全程40公里,其中15公里是沿着河岸向西北行驶,在奔驰的汽车上看到了这一罕见的菜粉蝶迁飞情况。16日下午7点多菜粉蝶停飞后,见到勿乱沟至下纳岭村的山谷间约长1.5×0.1-0.3公里的面积上,沿河的人路边、树林、作物田间,都有菜粉蝶栖息。据陈永元观察,每株玉米上栖有60多头,马铃薯、甘薯杂草上都有,地面上几乎无落脚之处,1平方米有菜粉蝶22—140头或更多。树干的下半截爬满了粉蝶。
At noon August 16, 1989, an average of 1,400 meters above sea level in northern Hebei Duanchaogou found that a large number of cabbage butterflies flew over the river to fly to the southeast, do not chaos ditch Township Shangyi County and the Kanxia region 4 streams Yonghe The resort river, down the river, earth road, river Selkirk convergence point, thus converging into the Yang River. Cabbage butterfly around here along the dry tributaries pool. In order to understand the dynamic state of the cabbage butterfly, about 4 o’clock in the afternoon, the author drove back to Shangyi County by not chaos ditch. The entire 40 km, of which 15 km along the banks of the northwest driving in the Mercedes-Benz car saw this rare cabbage butterfly flying situation. At 7:00 pm on the 16th, when the cabbage butterfly parked for a flight, it saw an area of about 1.5 × 0.1-0.3 km between the valleys of the Shinagou Gulch to the lower Nailing village. People along the river’s roadside, woods, crop fields, Cabbage butterfly habitat. According to Chen Yongyuan observation, habitat per plant on corn more than 60, potatoes, sweet potatoes are weeds, there is almost no place on the ground, 1 square meters cabbage butterfly 22-140 or more. The lower half of the tree trunk covered with butterflies.