摘要
研究了桃红颈天牛幼虫的蛀道特性及排粪习性。①该虫蛀过曲折复杂，蛀害韧皮部的蛀道洞口朝上，蛀害木质部的洞口朝下。达木质部的蛀道长度178～22．1cm，洞底距洞口的垂直距离约为12cm。②幼虫的粪周不直接排到洞口外，而留是在蛀道内，当粪屑堵塞蛀道时，才将其推到洞外。幼虫推粪时可达距洞口3．3～4．0cm处。当粪屑被推紧济实、不能掉出洞外时，幼虫则另辟新洞口。③幼虫推粪高峰在晚19：30至早7：00，1d推1次粪的情况居多，占总观察频数的477％；1d椎2次及3次粪的分别占28．4％及7．6％；2d推1次粪的占6．6％；也见3d，4d以至9d推1次粪的现象。④概率分析的结果表明每4d推1次粪至每1d推4次粪的概率为0．7365，从而表明桃红颈天牛幼虫推粪的时间间隔主要（73．65％）出现在每4d推1次至每1d推4次之间，其概率函数为：
The characters of apricot boring trunks and expelling frass of Red Necked Longicorn (RNL, Aromia bungii Falderman) were identified. The results showed as follows: ①The paths bored by RNL in the trunk were tortuous and complicated. The mouths of paths were upward at the phloem and downward at the xylem. The length of the paths was 17. 8-22. 1 cm. The vertical distance from bottom of the path to the mouth was 12 cm roughly.The larvae were staying or eating at the bottom of the paths. ②The frass of RNL was not excreted to the outside of the trunk immediately after larvaets eating and it was only discharged when it was full in the path. The larvae of RNL removed the frass as far as 14.5 18. 1 cm from the bottom. They had seldom however reached to the mouths. The new mouths were bored when the frass was too much and too hard to be cleaned out. ③ The frass expelling time was mainly concentrated on 19: 30pm to 7: 00am. Most larvae expelled frass once during one day. Some larvae cleaned frass out three or four times a day. There were a very few larvae expelled once every three or four days, even nine days. The frequencies of frass expelling for three times, two times and only one time a day were 7.6%, 28. 4% and 47. 7% respectively. ④ The probability analysis of frass expelling suggested that the major type of intervals of 0. 25 day to 4 days in between counted on 0. 736 5. The function formula of the probability was
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1999年第5期87-91,共5页
Journal of China Agricultural University
基金
IFS基金
北京市林业局资助
