2.1 Insects rearing and antennae collection
C. punctiferalis larvae were collected from corn ear at Langfang Experimental Station of Chinese Academy of Agricultural Sciences, Hebei Province, China, and reared on fresh corn ear in an environmentally controlled room at 27 ± 1 °C, 70-80 % relative humidity (RH), and 16:8 light: dark (L:D).
C. pinicolalis larvae were collected from the masson pine in Quanjiao County (32.07 N 117.54 E), Anhui Province, China. Fresh masson pine branches were used to feed the larvae under ambient conditions 27 ± 0.5 °C, with 70-75 % relative humidity (RH) and a photoperiod of 16:8 h light: dark (L:D). After emergence, the moths were feed on 10% honey solution (Braccini et al., 2015).