A Preliminary Field Study of Two Releasing Ways of Arma chinensis for Control of Dendrolimus punctatus in Pine Forest

doi:10.16409/j.cnki.2095-039x.2024.07.003

Abstract

Abstract: Dendrolimus punctatus is one of the main forestry pests damaging the pine in China. The pest outbreak usually leads to a large area of pine death. As an excellent predatory natural enemy insect, Arma chinensis has been successfully propagated at a large scale. In recent years, the agriculture, forest and tobacco industries have increased the field research and application of A. chinensis. However, little is known about the application of A. chinensis in prevention and control of D. punctatus in the forest. In this study, the 5^th instar A. chinensis nymphs were evaluated for their control of the D. punctatus 3^rd instar larvae in cage tests in the forest and in direct release tests in the natural state. The results showed that under food saturation conditions, the control efficiency of the predator increased significantly with the extension of the time post release. Specifically, the control efficiency in Plot 1 increased from 20.34% on the first day to 49.09% on the 3^rd day and in Plot 2, from 20.69% on the first day to 41.82% on the 3^rd day. Although there were obvious differences in habitat conditions between Plot 1 and Plot 2, the control efficiency afforded by the predators did not differ significantly within the same release interval. In addition, at 15 days post release of the predators in pine forests under natural conditions, the corrected control efficiency on the 3^rd instar larvae of D. punctatus reached 63.91%, which significantly improved in comparison with that at 7 days post release. These results show that the natural enemy A. chinensis affords efficient control of the population of D. punctatus in the pine forest.

Key words: Arma chinensis, Dendrolimus punctatus, biological control, field test

CLC Number:

S476.2

DENG Wan, HUANG Ke, HU Qian, LI Luoxiu, LIU Qing, YUAN Jie, LI Mi. A Preliminary Field Study of Two Releasing Ways of Arma chinensis for Control of Dendrolimus punctatus in Pine Forest[J]. Chinese Journal of Biological Control, 2025, 41(1): 186-192.

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