两个温度条件下台湾稻螟的实验种群生命表

Life table of the laboratory population of Chilo auricilius Dudgeno at different temperatures

文章比较了两个温度下的台湾稻螟实验种群年龄生命表,并分析了台湾稻螟种群的关键虫期,为了解台湾稻螟的种群特性及把握防治时机等提供依据。结果表明:27.5℃时,台湾稻螟的卵、幼虫、蛹、成虫的发育历期分别为5.64d、17.93d、6.29d、6.73d;30℃其发育历期分别为4.76d、15.40d、5.96d、2.96d。27.5℃台湾稻螟蛹重为0.050g(♀)和0.031g(♂),体长为11.93cm(♀)和10.43cm(♂),30℃其蛹重为0.072g(♀)和0.037g(♂),体长为13.90cm(♀)和11.77cm(♂)。研究发现:30℃与27.5℃相比,虽然台湾稻螟的发育历期变短,蛹重和体长增加,但是世代总存活率从28.57降低到17.81,种群趋势指数从18.68降低到9.99。结论:台湾稻螟的实验种群存活曲线属于Price所提出的昆虫存活曲线中的曲线整体呈凹型,在发育早期具有较高的死亡率。台湾稻螟的虫期控制数表明,卵期、1龄幼虫期是影响台湾稻螟室内种群变动的关键虫期,此时可作为最佳防治时期。

In order to understand the population characteristics and the favorable opportunity for its contr,, the paper compares the age specific life table of Chilo auricilius Dudgeno lab population at two temperatures and analyzes key developmental stages. The development duration of eggs, larvae, pupae and adults is 5.64d, 17.93d, 6.29d, 6.73d, respectively at 27.5℃, but it is 4.76d, 15.40d, 5.96d, 2.96d at 30℃. The pupal weight is 0.050g （ 9 ） and 0.031g （/5 ） at 27.5℃, and it＇s 0.072g （ 2 ） and 0.037g （ 8 ） at 30℃. The body length is 11.93cm（ ♀ ） and 10.43cm（ ♂ ） at 27.5℃, but it＇s 13.90cm （ ♀ ） and 11.77cm（ ♂ ） at 30℃. The results show that at 30℃, although under shorten development process, the weight and body length of pupa is enlarger than which at 27.5 ℃, the overall survival rate of generations is decreased from 28.57 to 17.81, and the index of population trend （I） is drop to 9.99 from 18.68. The survival curve of laboratory population belongs to a concave curve in insect survival curve present by Price, which shows higher mortality rate in early development. Index of population control （IPC） shows the eggs and 1st instar are the key stage to affect the lab population quantity of C. aurieilius, could be the optimum control periods.