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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
Sponsored by:Chinese Society of Entomological;institute of zoology, chinese academy of sciences;
Address:Chaoyang District No. 1 Beichen West Road, No. 5 hospital,Beijing City,100101, China
Your Position :Home->Past Journals Catalog->2018年55 No.2

Relationship between cropping regimes and pest insect abundance
Author of the article:CHEN Fang1** WANG Xiao-Yi2*** ZHOU Jing1 DUAN Xiang-Kun1 LUO Yan-Na1
Author's Workplace:1. Research Institute of Agricultural Sciences, the Sixth Division of Xinjiang Production and Construction Corps, Wujiaqu 831300, China; 2. Key Laboratory of Forest Protection, State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
Key Words:Sogatella furcifera, migration dynamics, mesoscale source areas, trajectory analysis

 [Objectives]  To understand the effects of cropping regimes on pest insect abundance, pest species diversity and population dynamics was measured and compared in monocultures, mixed crops and crops with farmland shelterbelts, in the western, central, and eastern areas of the Sixth Division of the Xinjiang Production and Construction Corps (6th Division, XPCC) in summer and autumn. [Methods]  The number of pest species and the diversity of pests and natural enemies in the four cropping regimes were surveyed. [Results]  Species diversity and numbers of pests and natural enemies in autumn were significantly higher (4.7 and 2.7 times, respectively) than those in summer. There were significant differences in the number and types of insect pests on different farms. The highest average number of insect pests was found in Fangcaohu farm, which was 2.8 times that found in Qitai Farm. There were significant differences in the species of pests found on different crops, but no significant difference in their population densities. Pest species diversity was significantly higher in intercropped fields and those with shelterbelts than in monocultures and field edges, but pest densities in monocultures and field edges were 2.1 times those in intercropped fields. The number of natural enemies varied greatly among different survey sites, crop types and habitats. Qitai farm had the highest number; 2.9 times higher than Gongqingtuan farm. Natural enemies were most abundant in fields with shelterbelts where they were 7.5 times higher than in monocultures. The number of natural enemies on the plants near field edges was 3.1 times higher than in monocultures. A total of 8 species of predatory ladybird beetles were found in the study area, of which Adonia variegata (Goeze) was the most abundant (31.92%), followed by the Stethorus punctillum (Weise), (26.54%). A. variegata is therefore the most promising potential biological control. The biodiversity index of arthropods in different habitats was varied. Biodiversity was the highest in shelterbelts, followed by intercropped fields and lowest in monocultures. [Conclusion]  The species diversity and population dynamics of insect pests and their natural enemies differed in different cropping regimes. These findings provide a scientific basis for the effective control of crop pests and rational planting and management regimes.

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