Estimation of developmental parameters for adult emergence of Gonatocerus morgani, a novel egg parasitoid of the glassy-winged sharpshooter, and development of a degree-day model

► Optimal temperature for Gonatocerus morgani development is 29.22 °C. ► The upper threshold for G. morgani development is 33.49 °C. ► Degree-day (DD) requirement is 189.75 DD above the lower threshold of 9.71 °C. ► DD model well predicted G. morgani development in field with ⩽2 d difference.