Incubation
Incubation period was the duration between the dates of egg laying and hatching. The incubation period was 2 to
4 days with an average of 3.10 ± 0.22 days (Table 1). Islam and Nasiruddin (1978) observed that the
incubation period of M. discolor was 2 days on cotton aphid. However, Ngammuang (1987) and Prodhan et al
(1995) reported that it was 2 and 3 days respectively using bean aphids as host. These results seem to be close
with the present observation.
Table 1. Duration of different stages of M. discolor as noted in the study