大螟人工饲养技术的初步研究

利用大豆粉、玉米粉、麦胚和鲜茭白等成分配制了大螟Sesamia inferens(Walker)的半合成人工饲料,利用该饲料配方,发展了大螟的长期、继代饲养技术,即初孵-2日龄幼虫在茭白上饲养,3日龄-化蛹在人工饲料上饲养。利用该方法连续饲养大螟3代,幼虫的发育历期、蛹重、幼虫存活率、化蛹率、羽化率、卵孵化率和单雌产卵量等生活史参数与在天然饲料茭白上饲养的大螟相比,二者没有任何显著差异。而且利用该方法饲养,成本低、省工省力,能显著减少病原菌的感染。这说明该饲养技术适于大螟种群的长期、继代饲养。

A preliminary study on artificial rearing of the pink stem borer, Sesamia inferens

An artificial diet for rearing the pink stem borer, Sesamia inferens（Walker）, was formulated with soybean powder, corn powder, wheat germ powder and freshwater bamboo as the major components. A rearing technique for the mass and repeated production of S. inferens was developed using freshwater bamboo （a natural food source） for young larvae （neonates to 2rd instar） and the artificial diet for older larvae （3rd instar and above）. The performance of S. inferens reared on this fresh water bamboo/artificial diet regimen was evaluated over 3 consecutive generations by comparison with individuals fed only on freshwater bamboo for an entire generation. The fitness indicators of larval duration, pupal weight, larval survival rate, pupation rate, eclosion rate and number of eggs laid per female were similar between these two diet regimens. However, the fresh water bamboo/artificial diet combination reduced costs by saving a considerable amount of labor and time, and by significantly reducing the rate of insecticidal pathogen contaminations. The new diet and rearing technique are suitable for mass and repeated production of the pink stem borer.