diapause, also known as hibernation, in european corn borers is induced by temperature and changes in daylight length. at higher temperatures, shorter photoperiods are sufficient to induce diapause. at 13.5 hours of light followed by 10.5 hours of dark, 100% of european corn borer larva entered diapause regardless of temperature with the range of 18 to 29 degrees celsius. at high temperatures and long photoperiods, fewer larva enter diapause.