用甜玉米粒饲养二化螟实验种群

介绍一种能够继代饲养二化螟Chilo suppressalis(Walker)实验种群的天然饲料---"甜玉米粒"及相应饲养方法。结果显示,甜玉米粒和马蹄的饲养成绩皆不同程度地高于稻苗、甘蔗和田间种群。取食甜玉米粒的幼虫存活率达92.0%,显著高于其余3种天然饲料。平均蛹重为60.7mg,单雌产卵量达197.4,除性比为0.9∶1之外,其重要生物学指标和此前报道的饲养成绩最好的马蹄没有显著差异,但成本更低,且更利于清洗消毒等加工处理,因而更适于在实际生产中大量饲养二化螟实验种群。

Utilization of sweet corn grain in mass-rearing experimental populations of the striped stem borer, Chilo suppressalis

Four local natural plant resources, rice seedling, water chestnut, sweet corn grain and sugarcane, in Guangdong and Guangxi of China were evaluated for their suitability as natural diets of the striped stem borer, Chilo suppressalis (Walker) in the mass-rearing of experimental populations. The results showed that the larvae feeding on sweet com grains and water chestnuts had great superiority over those feeding on rice seedlings, sugarcane and those from field population. The larvae feeding on sweet corn grains had higher values of biological index, 92.0% of survival rate, 60.7 mg of average pupal weight, and 197.4 eggs per female of fecundity, except sex ratio (0.9:1) . There was no significant difference in the suitability between sweet corn grain and water chestnut which had been regarded as the best natural plant diet before. Therefore, sweet com grain could serve as a suitable natural plant diet for mass-rearing of the rice striped stem borer due to the advantages of convenience for sterilization and lower cost.