1.Population Density and Food Quality (1)Generally,migratory trait of locusts is influenced by population density of locusts and availability of host plant.At the same time,availability of host plant is adjusted by population density.It is often found that migrating or scattering occurs during the insect larval or adult stage when the population density is higher,resulting in a lower population density that can avoid competition between individuals. (1) Generally, migratory trait of locusts is influenced by population density of locusts and availability of host plant. At the same time, availability of host plant is adjusted by population density. It is often found that migrating or scattering occurs during the insect larval or adult stage when the population density is higher, resulting in a lower population density that can avoid competition between individuals. 1. Population Density and Food Quality Population Density and Food Quality