Comparative Susceptibility of Larval Mosquitoes Exposed Separately by Instar or in Mixed Populations to the Nematode Romanomermis culicivorax.
Comparative Susceptibility of Larval Mosquitoes Exposed Separately by Instar or in Mixed Populations to the Nematode Romanomermis culicivorax.
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发表时间：
1981-04
影响因子：
1.3
通讯作者：
J. J. Petersen-J.
中科院分区：
文献类型：
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作者：
J. J. Petersen-J.
已多次释放索线虫Romanomeris culicivorax以控制自然种群的幼虫蚊子。一般来说，当所有龄期都存在于栖息地时，这种释放导致的感染水平在二龄和三龄宿主中最高，在一龄宿主中最低（1，3）。这与实验室研究的结果形成鲜明对比，实验室研究表明，第一和第二龄宿主对感染高度敏感，第三龄宿主对感染的敏感性约为第一和第二龄宿主的一半，而第四龄宿主仅轻微敏感（2）。在田间试验中，一龄宿主的寄生发生率明显降低，部分原因是在感染性寄生虫数量下降后，新蚊子幼虫不断孵化（2）。此外，据本地治里病媒控制研究中心1977年年度报告（印度医学研究理事会，1978年）报告，混合种群中的早期幼虫比较老的幼虫更不易感染罗马虫。奥默米斯·艾扬格里。因此，实验室
The mermithid nematode Romanomeris culicivorax has been released many times to control natural populations of larval mosquitoes. Generally, infection levels resulting from such releases were highest in secondand third-instar and lowest in first-instar hosts when all instars were present in the habitat (1,3). This contrasts sharply with well.established results from laboratory studies which showed that firstand second-instar hosts were highly susceptible to infection, third-instar hosts about half as susceptible, and fourth-instar hosts only slightly susceptible (2). The apparently reduced incidence of parasitism of first-instar hosts in field trials was attributed, in part, to continuous hatching of new mosquito larvae after the numbers of infective parasites declined (2). Additionally, it was reported in the 1977 Annual Report of the Vector Control Research Centre, Pondicherry (Indian Council of Medical Research 1978), that early instar larvae in mixed populations were less susceptible than older larvae to infection by Roman. omermis iyengari. Therefore, laboratory