Abstract:
[Objectives] To clarify the
migration of migratory pests in Shandong province, which is located on the main
north-south insect migration passageway in China, and is therefore important to
the monitoring and control of migratory pests in the rest of China. [Methods] Searchlight-traps and ground light-trap were used to monitor migratory insects from early September to the end of October
2018 at 14 monitoring stations in Shandong province. This is the first investigation
of the migration routes of species migrating southward in Shandong province. [Results] Many important insect pests, such as Helicoverpa armigera, Ostrinia nubilalis, Conogethes punctiferalis, Leucania loreyi, and several of their natural
enemies, such as Chrysoperla sinica, Chrysop
pallens, were trapped.
Based on sudden fluctuations in the numbers of insects trapped by
searchlight-traps, and the ratio of insect populations trapped by
searchlight-traps and ground light-traps, we found that 17 species undergo
obvious migrations in this period, including H. armigera, O. furnacalis, C. punctiferalis, L. loreyi, Agrotis segetum, Agrotis tokionis, Spodoptera exigua, Spodoptera litura, Ctenoplusia agnata, Agrius convolvuli, Diaphania indica, Hymenia recurvalis, Botyodes diniasalis, Limabean
pod borer, Gryllotalpa orientalis, Chrysoperla
sinica and Chrysop pallens. The main sites of north to south insect
migration were Ningjing (25.90%), Jiyang (20.81%), Qingyun (12.31%), Caoxian
(9.26%), Heze (7.09%) and Linqing (5.47%). [Conclusion] Numerous insect species migrate from north to south through Shandong province,
mainly through the western part of the province.