Acknowledgments
This work was partially supported by the National Basic
Research Program of Ministry of Science and Technology, China
(973 Program, 2012CB114105), the Special Fund for Agro-Scientific
Research in the Public Interest (201303019), and China Agriculture
Research System(CARS-25-B-06).We are grateful for the assistance
of all staff and students in the Key Laboratory of Applied Ento-
mology, Northwest A&F University at Yangling, Shaanxi, China.