Abstract:

To identify the pupation rules of larvae of Bactrocera minax and the influencing factors in Hunan, the number and pupation progress of the larvae on wormy filter were observed in Changsha, Shimen, Shaoyang and Jishou, and the correlation analysis with the main meteorological factors were conducted. The results showed that, the pupation number of the larvae on Satsuma mandarin ‘Miyagawa’ and Citrus sinensis ‘Newhall’ wormy filter were both as follows: Shaoyang> Changsha> Jishou> Shimen; the pupation stage of the larvae on Satsuma mandarin ‘Miyagawa’ wormy filter in different observation sites were all before October 10, and the longest pupation duration was observed in Jishou; the pupation time of the larvae on Citrus sinensis ‘Newhall’ wormy filter was mainly from late October to early November in Changsha, Shaoyang and Shimen, and the longest pupation duration was observed in Jishou; the pupation of larvae on Satsuma mandarin ‘Miyagawa’ wormy filter was significantly and positively correlated with the minimum temperature and relative humidity, and the pupation of larvae on Citrus sinensis ‘Newhall’ wormy filter was significantly and negatively correlated with relative humidity. Thus, when formulating a plan for picking up the wormy filter, varieties and regional differences should be considered, the time of picking up wormy filter in Satsuma mandarin orchards should be earlier than that in Citrus sinensis orchards. The Satsuma mandarin orchards should focus on picking up the wormy filter dropped before October, and finish the picking before the local peak of the pupation; the Citrus sinensis orchards should focus on picking up the wormy filter dropped around the middle of October, and finish the picking before October 24.

Key words: Bactrocera minax, larvae, pupation progress, pupation rule, meteorological factors