The Observations on the Oviposition of Some Aphids

In Japan, many kinds of aphids over winter in the egg stage on their host plants. It is a well known fact that the oviparous females in bisexual generation deposite the eggs around the winter buds of the twigs of the host plant under outdoor conditions. Hitherto, this fact has been recorded by several workers as shown in Table 1. In this paper the author reports the results of some observations on the oviposition habit of the oviparous females. The author has observed that the oviparous females prefer cotton fibre to other things in their oviposition as shown in Table 2. It seems very possible to the author that the oviparous females are not sensitive to the host plant in their oviposition. It is considered to be a certain fact that the oviparous females lay all of the eggs in a few day after mating as shown in Table 3.