Higher temperatures may cause them to sprout. This beetle is resistant to many controls, including insecticides. The wing covers alternate creamy yellow with ten black stripes. Their range is most of North America with the exception of the South and Pacific Northwest. They can strip plants of foliage and do the most damage in small plots.
Crop rotation is a good defense.
Interplant with repellant plants such as snap beans, marigold, garlic, onions, flax, catnip, coriander, nasturtiums, tansy, dead nettle and horseradish. Because they are not good climbers, grubs can be halted by thick mulch. Bt i s effective against larvae when applied early. Predators include toads, paperwasps and ground beetles. Try sprinkling the plants with water, then with wheat bran.