It may be an animal that eats the heart of rape. It is small in size, wraps itself in a spider web and often eats the growth center of vegetables, which is almost devastating to vegetables.

The other is Pieris rapae, which is large in size and mainly eats the leaves of vegetables. It has a large appetite and fast reproduction.

These two kinds of pests can be controlled by pyrethroids with low toxicity and biological insecticides such as Bacillus thuringiensis, Beauveria bassiana, avermectin and matrine.