Scanning electron microscopic and biological observations ofHepialus gonggaensis egg

The egg of Hepialus gonggaensis was oval in shape and the surface of chorion under scanning electron microscopy revealed a portion of micropyle which was on the egg crown forming into irregular pear-like pulvinus.The micropyle was in the medial hollow part at the top of pulvinus.The other portionof egg was covered densely by tiny granules.During the last ten days of June to July every year, the eggs were laid dispersively near the host plants.Under 8-10℃average temperature and 80%-90% relative humidity,the incubation period was about 50 days with and hatching rate over 75%.In egg stage,the ova always endangered by fungus and natural enemy parasitic wasp.