| 潘雪红，魏吉利，商显坤，黄诚华,2025,甘蔗黄螟幼虫龄数的划分及其发育历期观察[J].环境昆虫学报,(2):651-657 |
| 甘蔗黄螟幼虫龄数的划分及其发育历期观察 |
| Larval instars determination of Tetramoera schistaceana (Lepidoptera: Olethreutidae) and observation of its developmental periods |
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| DOI： |
| 中文关键词: 甘蔗黄螟 幼虫龄期 头壳宽度 Crosby 指数 回归分析 |
| 英文关键词:Tetramoera schistaceana Snellen larval instars head capsule width Crosby's ratio regression analysis |
| 基金项目:广西自然科学基金（2021GXNSFAA196002）；财政部和农业农村部：国家现代农业产业技术体系（CARS-170305)；广西农业科学院基本科研业务专项（桂农科2021YT003） |
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| 中文摘要: |
| 为明确甘蔗黄螟Tetramoera schistaceana Snellen幼虫的龄数和发育历期，以便进一步研究其生物学生态学特性，为该虫的预测预报和精准防控提供科学依据，本试验以天然饲料茭白Zizania caduciflora为寄主饲养的甘蔗黄螟为研究对象，对不同龄期幼虫的头壳宽度和发育历期进行了测量，并对所测得的数据进行了Crosby指数、Brook指数、频次分布和回归分析。结果表明：甘蔗黄螟幼虫经过5个龄数进入化蛹，各龄头壳宽值分别为：0.293 mm、0.437 mm、0.615 mm、0.911 mm和1.222 mm。头壳宽符合Dyar法则和Crosby法则。头壳宽与龄数间的直线、二次和指数拟合模型均较好。指数拟合模型的决定系数（R2）最大，拟合度最好。在26℃温度下，1~5龄幼虫平均龄期分别为2.766 d、2.913 d、3.107 d、3.413 d和8.860 d。甘蔗黄螟幼虫有5个龄期，头壳宽是甘蔗黄螟幼虫虫龄判定的重要指标。在26℃条件下，从卵孵化，雌、雄幼虫平均分别需要20.265 d和19.250 d后进入化蛹。 |
| 英文摘要: |
| Larval instars of Tetramoera schistaceana and its developmental duration were clarified to study its biological and ecological characteristics, providing scientific basis for forecasting and controlling this pest. T. schistaceana fed with natural feed Zizania latifolia (Griseb.) in the laboratory were the research object in this paper. Head capsule widths and developmental periods of larvae at each larval instar were measured and analyzed by Crosby ratio, Brook ratio, frequency distribution and regression analysis. The results showed that T. schistaceana passed through five larval instars to attain its pupal stage where the head capsule widths of 1st~5th instar larvae were 0.293 mm, 0.437 mm, 0.615 mm, 0.911 mm and 1.222 mm, respectively. Their head capsule widths conformed to Dyar's law and Crosby's law. The fitting degrees of linear，quadratic and exponential fitting models between head capsule width and instar were all fine. When the coefficient of determination (R2) of the exponential fitting model was the largest, the fitting degree was the best. So head capsule widths could be used as an important indicator for larval instars determination. The mean instars of 1st~5th instar larvae were 2.766 d , 2.913 d , 3.107 d , 3.413 d , and 8.860 d respectively at 26℃. T. schistaceana larvae had five instars. The head capsule width was an important index for distinguishing the larval instar of T. schistaceana. From egg hatching to pupation, female and male larvae needed 20.265 d and 19.250 d on average at 26℃, respectively. |
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