Many weed species attract beneficial insects that improve soil qualities and forage on weed pests. Aphids are among the most destructive insect pests on cultivated plants in temperate regions. Aphids, mealybugs and other invertebrate pests can spread viruses. Other insect pests that make attractive targets are moths. Predatory mites may be useful in controlling some mite pests. They then prey upon insect pests on nearby plants. Other species have been used for biological control of insect pests. Insecticides are used to rid farms of pests which damage crops. It is said to deter some common insect pests, as well as nematodes. The protein is poisonous to certain insect pests. The resulting GMOs are resistant to some insect pests. Pesticides are substances that are meant to control pests, including weeds. "Ribes" plants are susceptible to several diseases and a number of insect pests. Infestation is the state of being invaded or overrun by pests or parasites. Storage facilities should be protected from small grain pests, rodents and birds.