Biological pest control predatory midge "Feltiella acarisuga", and a ladybird "Stethorus punctillum". The bug "Orius insidiosus" has been successfully used against the two-spotted spider mite and the western flower thrips ("Frankliniella occidentalis"). Predators including "Cactoblastis cactorum" (mentioned above) can also be used to destroy invasive plant species. As another example, the poison hemlock moth ("Agonopterix alstroemeriana)" can be used to control poison hemlock ("Conium maculatum"). During its larval stage, the moth strictly consumes its host plant, poison hemlock, and can exist at hundreds of larvae per individual host plant, destroying large swathes of the hemlock. Not all biological control agents are directed at
Rockstone poison dart frog Rockstone poison dart frog The Rockstone poison dart frog ("Dendrobates nubeculosus") is a poorly known species of dendrobatid frogs endemic to Guyana. As it is known from only one specimen, very little information is currently available on "D. nubeculosus". It has been suggested to be one of the most poorly known species in the world. "D. nubeculosus" is a small to medium-sized poison dart frog; larger than many of its contemporary "Ranitomeya" species, but smaller than the other members of the genus "Dendrobates". The holotype specimen measures 2.5 centimetres in length, and the species' size range is unknown. It is