期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Effective accumulated temperature and developmental threshold temperature for Semanotus bifasciatus(Motschulsky) in Beijing 被引量:6
1
作者 MA Li-qin GAO Shi-ji +2 位作者 WEN Jun-bao ZONG Shi-xiang XU Zhi-chun 《Forestry Studies in China》 CAS 2008年第2期125-129,共5页
In order to understand the occurrence and development of Semanotus bifasciatus (Motschulsky), a borer insect of Platycladus orientalis in parts of northern and eastern China and to improve its prediction, the develo... In order to understand the occurrence and development of Semanotus bifasciatus (Motschulsky), a borer insect of Platycladus orientalis in parts of northern and eastern China and to improve its prediction, the developmental threshold temperature (C1) and effective accumulated temperature (K) of S. bifasciatus were determined under conditions of constant and variable temperatures. The results show that under constant temperatures the value of C1 has a range of 8.90±1.77℃and the value of K lies between 95.19±13.14 degree-day for eggs; the values for larvae are C1= 13.26±3.06℃ and the number of degree-day is K 2,885.07±187.87 degree-day; for pupae the ranges are C1 = 8.93±2.49℃ and K= 131.20±25.63 degree-day. Under the condition of ambient temperatures, the values for eggs are C1= 17.33±1.24℃ and K= 70.79±8.99 degree-day. It is suggested that S. bifasciatus adults over-winter in a state of dormancy, not at a diapause. Warm winter may accelerate the life cycle ofS. bifasciatus. Equations can be used to predict an early occurrence ofS. bifasciatus. 展开更多
关键词 semanotus bifasciatus (Motschulsky) developmental threshold temperature effective accumulated temperature eggs larvae PUPAE
下载PDF
Comparison of host volatiles under different physiological states and electroantennogram responses of Semanotus bifasciatus (Motschulsky) to these volatiles
2
作者 SUN Yue-qin LUO You-qing YAN Xiong-fei 《Forestry Studies in China》 CAS 2008年第1期64-66,共3页
Based on an analytical TCT-GC/MS method, volatile compounds of branches of Platycladus orientalis under three physiological states (healthy, weak and baited trees) were analyzed. The results showed that α-pinene, ... Based on an analytical TCT-GC/MS method, volatile compounds of branches of Platycladus orientalis under three physiological states (healthy, weak and baited trees) were analyzed. The results showed that α-pinene, β-phellandrene, 3-careen, limonene and thujopsene were released under all three physiological states. There were other kinds of volatiles released from branches of weak P. orientalis trees, such as camphene, γ-terpinene, (+)-4-carene and cedrene, but these four volatiles compounds were not released from the branches of healthy P. orientalis. Volatile components from the physically damaged branches of P. orientalis had changed. β-terpinene, mycrene, isocaryophillene and caryophyllene were identified in both healthy and weak branches of P. orientalis. Only cedrene was identified in the baited wood. Electroantennogram (EAG) tests were conducted with nine volatile compounds from the branches of P. orientalis. Antennnae of male and female Semanotus bifasciatus (Motschulsky) were highly sensitive to these nine volatile compounds. Cedrene elicited the strongest response, whereas β-terpinene the lowest. Males and females showed no signifi-cant difference in their EAG responses to the nine volatile compounds. 展开更多
关键词 Platycladus orientalis semanotus bifasciatus (Motschulsky) volatiles electroantennogram (EAG)
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部