Blue dots indicate deployment and collection sites of wild larvae and pupae masses in China, 2016-2019. Dendrolimus houi was discovered at Sites 1 and 15. Geographical coordinates are as follows: Site 1 (FJG): 26°35'33.23" N, 117°31'17.18" E; Site 2 (FSC): 26°8'28.94" N, 117°45'31.43" E; Site 3 (FYD): 25°46'29.49" N, 118°59'8.37" E; Site 4 (FFY): 27°7'41.18" N, 120°5'5.14" E; Site 5 (FFC): 27°16'46.26" N, 120°2'13.21" E; Site 6 (FWW): 27°48'52.32" N, 117°42'36.16" E; Site 7 (FXY): 26°49'47.74" N, 119°54'28.67" E; Site 8 (SCZ): 30°45'1.26" N, 103°28'30.72" E; Site 9 (HLG): 29°24'45.20" N, 109°18'5.50" E; Site 10 (GSS):  27°34'56.05" N, 108°1'49.70" E; Site 11 (GQL): 27°56'55.15" N, 107°11'56.94" E; Site 12 (ZSN): 28°24'46.33" N, 119°22'35.09" E; Site 13 (ZSG): 28°21'21.1" N, 19°8'40.91" E; Site 14 (ZPD): 28°58'57.84" N, 120°33'4.8" E; Site 15 (YPJ) 22°59'36.13" N, 101°05'31.39" E.