Nematodes, also known as roundworms, can parasitize a wide range of insect pests. There are various species and strains, all with great differences in efficacy.
The predatory bug Orius laevigatus is the most widely used Orius species for the biological control of thrips. Under normal conditions the females consume around 12 thrips a day.
The predatory mite Neoseiulus californicus is an effective natural enemy of various species of spider mite. Although the mite cannot see, it is well able to find its prey.