Amsacta flavicosta has been known as a minor pest of cowpeas in northern Nigeria but during the crop season of 1974-75 it appeared in major pest proportion at Nsukka, in Eastern Nigeria. The biology of this insect was studied under natural green house conditions. The egg stage lasted 7.80±0.25 days. The 1st, 2nd, 3rd, 4th, and 5th larval stadia were 8.40±0.43, 3.80±0.27, 3.80±0.16, 7.00±0.13 and
... [Show full abstract] 5.60±0.22 days long, respectively. The pupal period was 20.14±0.54 days. The adult life span under captivity was 2.40±0.31 days in both sexes.