Overview 3.Characteristics 1)Abundant species; 2)Wide range of host plants.Most species are Polyphagous. 3)Long life cycle; 4)Most of the time in soil and hard to find; 5)Severe damage happens in both spring and autumn; especially in spring--causes a lot of young seedlings to die.6 3. Characteristics 1) Abundant species; 2) Wide range of host plants. Most species are Polyphagous. 3) Long life cycle; 4) Most of the time in soil and hard to find; 5) Severe damage happens in both spring and autumn; especially in spring--causes a lot of young seedlings to die. Overview