Household pests, like other insects, are gradually formed in the long-term evolution of nature in terms of their growth, reproduction and habits. Different species of insects have different living habits. Mastering the living habits of pests and understanding the regularity of their occurrence plays a very important role in finding out the weak links in the life history of pests or using certain habits for effective control.

The occurrence of household pests, in addition to external transmission, the pest itself has a strong reproductive ability, the vast majority of insects (including pests) are male and female, through mating, sperm and eggs combine, females lay fertilized eggs, each egg develop into a progeny. This is the most common way insects reproduce, called bisexual reproduction, such as moths and beetles.

Insect eggs are not fertilized to reproduce offspring, called parthenogenesis, such as ants.

After the eggs of insects mature in the mother's body, they do not lay, but stay in the mother's body, relying on the yolk of the egg itself to provide nutrients for development until hatching and producing larvae, which are called ovoviviparous, such as housefly.

Insects develop from one egg into two or more embryos, each embryo develops into a new individual, called polyembryony, such as the wheat moth wasp.

In the life of a pest, there are several changes in different insect states, that is, four insect states (or called insect stages), namely egg, larva, and first adult. Some pests do not go through the bat stage but have three insect states: egg, nymph and adult. Nymphs are similar in form to adults, and this metamorphosis is called incomplete metamorphosis. The adult is the last stage of the individual development process of insects, and it is also the reproductive period of mating, laying eggs, and producing offspring.

Adult worms generally choose a host suitable for the survival of their offspring. Eggs develop into larvae under suitable temperature and humidity conditions. The larval stage is a stage of massive feeding, which takes a long time and is very harmful to storage and food. The stage is an intermediate state in which insects transition from larvae to adults. The surface is relatively static, but new organs are being formed inside. The adult moths are harmless to storage and grain storage, and have a short lifespan, dying after laying eggs. The adults of the beetle are seriously harmful to the storage and grain storage. Some of them have a long lifespan and can lay eggs many times, and they will not die for up to 8 years. Some of them die a few days after laying their eggs. Household pests rely on different reproductive methods to reproduce and pass on from generation to generation.

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