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在25℃和70%的相对湿度条件下,将几种米象和玉米象的不同品系在有小麦、玉米两者,或仅有其中之一,或在大米上进行几代饲料,在每一代中,取出一些成虫放于小麦和玉米的混合物(等量混合)中5天,5天后分开两种谷物进行培养,对所产生各代进行计数,在小麦上羽化了大量的米象和少量的玉米象,对两个种类,当放置的成虫在玉米或大米上已经经历了其发育阶段,在分离后的小麦上出现的虫量就会减少.在不同的世代中,用一个相距40厘米的粮堆提供另一种食物,后代的分布与混合的食物很相似.在干预的后代中,用一个能够通过飞行达到的悬挂的包给玉米象提供食物,在这之后,发
Different strains of several rice and maize elephants are subjected to several generations of wheat, corn, or only one of them, or several generations of rice at 25 ° C and 70% relative humidity for each generation , Some of the adult worms were removed for 5 days in a mixture of wheat and corn (equal mix), and after 5 days the two cereals were cultured separately, the generations produced counted, the large number of rice elephants and a small amount of For two species of corn, the adults, when placed, have gone through their developmental stages on corn or rice, and the number of insects appearing in the separated wheat decreases. In a different generation, a 40 cm apart The food piles provide another type of food, and the distribution of the offspring is similar to that of the mixed food.In the intervening offspring, the corn is provided food with a dangling bag that can be reached by flight