Spotted cucumber beetle

The spotted cucumber beetle is a major agricultural pest insect. In the adult form it eats and damages leaves of many crops, including cucumbers, soybeans, cotton, beans and many others. In the larval form, which is known as the southern corn rootworm, it tunnels through the roots of young plants, stunting or killing them. These native pests have a wide range of host plants, but will readily infest a field of crop plants, most notoriously corn.
Adult beetles are greenish-yellow with twelve large black spots on each elytron. They are about half a centimeter long. The larvae are yellowish and wormlike.