摘要
通过室内饲养繁殖和野外采集,获得含有各龄桑天牛幼虫的杨树枝干,室内条件下分龄收集幼虫虫粪。对各龄幼虫虫粪进行区分,分离出粪粒和啃食残渣,对最末排粪孔长径和短径以及粪粒的理化性质与龄数关系进行研究。结果表明:桑天牛幼虫粪粒平均宽度值为1.211 5 mm,平均长度值为2.101 8 mm;粪粒中木屑平均宽度值为0.113 0 mm,平均长度值为0.207 3 mm;粪粒中蛋白质的平均含量为0.142 6%,总糖的平均含量为0.612 5%,纤维素平均含量为46.72%,木质素平均含量为16.12%。最末排粪孔长径和短径、粪粒长度和宽度、粪粒中木屑长度和宽度、纤维素含量、蛋白质含量均与幼虫龄数存在线性相关性,可作为快速识别幼虫龄数的指标,其中粪粒宽度比较稳定,在各龄数间无重叠,为林间快速识别虫龄的最佳指标。
This study obtained poplar branches containing Apriona germari larvae via indoor breeding and field collec- ting. In the laboratory, feces of different instar larvae were collected respectively. Feces of different instar larvae cloud separate fecal pellet and residue, and the relation with fecal pellet＇ physical and chemical properties and larvae instar was researched. The results showed that the average width of fecal pellet was 1. 211 5 mm, the average length of fecal pellet was 2. 101 8 mm; The average width of the wood dust in fecal pellet was 0. 113 0 mm, the average length of the wood dust in fecal pellet was 0. 207 3 mm; The average content of protein was 0. 142 6%, the average content of total sugar was 0. 612 5%, the average content of cellulose was 46. 72%, the average content of lignin was 16. 12%. There were liner correlations between the larvae instars and the length of fecal pellet, the width of fecal pellet, the width of the wood dust in fecal pellet, the length of the wood dust in fecal pellet, the content of cellulose and the content of protein respectively. The results showed that aforesaid features used recognition of larva instars in field were feasible. And the width of fecal pellet was the best index for identifying the larva instar rapidly in field, with the least overlap between neighbouring in- stars.
出处
《湖南林业科技》
2014年第1期7-13,共7页
Hunan Forestry Science & Technology
基金
湖南省林业厅资助项目"张家界松褐天牛生物防治工程"
关键词
桑天牛
幼虫虫粪
幼虫龄数
理化性质
Apriona germari （Hope）
larval feces
instar
physical and chemical properties
