The results showed that the newly hatched larvae preferred to feeding on glandless cotton and the 3rd instar larvae to feeding on heart leaves of corn.

• 结果表明:初孵幼虫嗜食无毒棉棉叶,3龄幼虫则喜食玉米心叶。5龄幼虫在甜玉米上的取食次数最多,取食总时间最长,在有毒棉上的取食时间最短。