Male: The posterior edge of the sixth abdominal segment is truncated, there is a transverse depression in the middle, and there is a row of long hairs on the upper edge.
Egg: 1.26 mm long; 0.60 mm wide. Orange-yellow bun, long oval, pointed at both ends. Standing in piles on the underside of cotton leaves. Each egg usually contains 20 to 40 eggs, with a maximum of 80 eggs.
Larvae: 4 instars in total. Main characteristics of each instar:
First instar: body length 2-3 mm. The body is all black. From the midthorax to the eighth abdominal segment, each segment has 6 hairy warts.
Second instar: body length 4 mm. The head and feet are all black, and the body is gray-black. The left and right rear corners of the front chest are yellow. There are 6 spiny warts on the back and sides of each abdominal segment. The two spiny warts on the left and right sides of the back of the first abdominal segment are yellow and have black spines. The yellow spots on the back of the fourth abdominal segment are not visible. The remaining warts are black.
