Package of 50 Podisus Nymphs. Podisus also known as the Spined Soldier bug feed on many soft bodied insects and insect larvae. They are commonly used to control caterpillars. The podisus stab their prey with their mouthparts, inject a toxin to immobilise prey, then suck the partially digested hemolymph. Podisus are not harmful to humans, other animals or the environment. Adult Podisus are highly mobile and will spread rapidly throughout the crop by walking and flying. Nymphs can walk easily from plant to plant when plants are touching each other.