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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2024年61 No.3

The occurrence of Panonychus citri in lemon orchards under large-scale cultivation and the plasticity of this pest to thermal stress
Author of the article:CHAI Wen-Jie, XU Yi-Long, NIU Xiao-Hui, FU Qiang, ZHENG Jian-Ying, YU Jin-Ke, GUO Yuan-Chao, WANG Ji
Author's Workplace:College of Plant Protection, Southwest University, Chongqing 400715, China
Key Words:Panonychus citri; extreme temperatures; monitoring and early warning; climatic factors; disaster-inducing mechanisms
Abstract:

Abstract  [Aim]   To improve the monitoring of the mite Panonychus citri, which has frequent outbreaks in citrus and other Rutaceae crops, and improve understanding of the mechanism responsible for outbreaks of this pest. [Methods]  The temporal occurrence patterns of P. citri were investigated in lemon orchards in Tongnan, Chongqing, the main lemon producing area in the world, from 2020 to 2022. The plasticity of P. citri to extreme thermal stress was also investigated. Three representative lemon orchards were selected as representative orchards in the core lemon planting area to investigate the spatial pattern and population dynamics of P. citri, and to analyze the key climatic factors responsible for outbreaks of this pest. [Results]  P. citri was found in lemon orchards from March to April and from September to November. Most were found in the upper crown of lemon trees during the period of occurrence. However, after the period of occurrence most were found in the middle and lower part of lemon trees. During this period the mite population on the adaxial leaf surface was significantly higher than that on the abaxial surface. Temperature, including the average, maximum and minimum, was the key climatic factor affecting the occurrence of P. citri. There were differences in the plasticity of P. citri collected in different seasons; those collected in winter were more tolerant of low temperatures and less tolerant of high temperatures, whereas those collected in summer were more tolerant of high temperatures and less tolerant of low temperatures. Mites collected in spring had intermediate tolerance to both high and low temperatures. [Conclusion]  P. citri is present year-round in lemon orchards in Tongnan under current management and climatic conditions, and has become a key target for control. There are two annual peaks of occurrence and temperature is the main climatic factor affecting the occurrence of this pest. Although the population size of P. citri is limited by the average and extreme temperature, its tolerance to extreme temperatures varies seasonally, which suggests that this pest has a strong plasticity to temperature stress.

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