Comparison of the main pest insects and their natural enemies in apple orchards with different pest control methods

doi:10.7679/j.issn.2095-1353.2020.01.013

Abstract

Abstract:

[Objectives] Insect diversity is an important component of biodiversity and plays a necessary role in bio-control and pollination. [Methods] During 2018-2019, we investigated the abundance of the main pest insects and their natural enemies in apple orchards with three different pest control methods; biological control (BC), functional plants (FP) to provide habitat for natural predators and chemical control (CC). [Results] We found that the abundance of the main pest insects, such as Aphis citricola, Panonychus ulmi and Lithocolletis ringoniella, in BC and FP apple orchards was much higher than in CC orchards. However, the abundance of natural predators of these pests, such as Harmonia axyridis, Chrysoperla sinicaand members of the Syrphidae, was also higher in FP and BC orchards than in CC orchards. [Conclusion] FP and BC can reduce the population density of pest insects in apple orchards. Although CC can keep pest insects at low numbers, it also suppresses their natural predators and CC orchards had greater fluctuations in pest abundance than BC and FP orchards.

Key words: apple tree, functional plant, biological control, arthropod community, biodiversity

Yun-Li XIAO, Wei GUO, Wen-Ying TANG, Zhi-Ping CAI, Kai YU, Tong-Xian LIU. Comparison of the main pest insects and their natural enemies in apple orchards with different pest control methods[J]. Chinese Journal of Applied Entomology, 2020, 57(1): 113-123.

Figures/Tables 15

Fig. 1 Occurrence trend of Aphis citricola during 2018 Data with different letters in the same year show significant difference at 0.05 level. The same below.

Fig. 2 Occurrence trend of Aphis citricola during 2019

Fig. 3 Occurrence trend of Panonychus ulmi during 2018

Fig. 4 Occurrence trend of Panonychus ulmi during 2019

Fig. 5 Occurrence trend of Lithocolletis ringoniella during 2018

Fig. 6 Occurrence trend of Lithocolletis ringoniella during 2019

Fig. 7 Occurrence trend of Jacobiasca formosana during 2018

Fig. 8 Occurrence trend of Harmonia axyridis during 2018

Fig. 9 Occurrence trend of Harmonia axyridis during 2018

Fig. 10 Occurrence trend of Chrysoperla sinica during 2018

Fig. 11 Occurrence trend of Chrysoperla sinica during 2019

Fig. 12 Occurrence trend of Misumenops tricuspidatus during 2019

Fig. 13 Occurrence trend of Syrphidae during 2018

Fig. 14 Comparison of amount of main pest insects and natural enemies in 2018 in Yantai apple orchard

Fig. 15 Comparison of amount of main pest insects and natural enemies in 2019 in Yantai apple orchard

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