The distinction between beneficial and pest is arbitrary, subjectively determined by examining the effect of a particular organism in a specific growing situation.There are many different types of beneficial organisms as well as beneficial microorganisms. Beneficial organisms include but are not limited to: Birds, Bears, Nematodes, Insects, Arachnids, and fungi. The ways that birds and bears are considered beneficial is mainly because they consume seeds from plant and spread them through feces. Birds also prey on certain insects that eat plants and hinder them from growing these insects are known as non beneficial organisms. Nematodes are considered beneficial because they will help compost and provide nutrients for the soil the plants are growing in. Insects and arachnids help the growing process because they prey on non beneficial organisms that consume plants for food. Fungi help the growing process by using long threads of mycelium that can reach very long distances away from the tree or plant and bring water and nutrients back to the tree or plant roots.
With beneficial organisms there is a flip side to these helpful organisms and that's the non beneficial organisms. These organisms hinder or stop the growing process or prey on beneficial organisms. Examples of these are Aphids, Assassin Bugs, and Japanese beetles. Aphids are attracted by pollen which is bad for plants because the aphids feed on the plants after they are located from spreading their pollen. Assassin Bugs are non beneficial because they feed on many beneficial insects by stabbing them with a horn on their head repeated times living up to its name "Assassin bug". Japanese beetles are especially a pest to gardeners and plants because the larva feed on the stems and roots while full grown beetles feed on leaves and flowers killing the plant.
Plants that perform positive functions can also be considered beneficials (