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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (31): 111-117.doi: 10.11924/j.issn.1000-6850.casb2025-0342

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Study on Tolerance of Pine Wood Nematodes to High Temperature Stress

YU Jinxiu1(), XIE Henghua2, HUANG Qing3, LI Mi1, XIE Yifei1, DENG Wan1, XUN Biaobing4, LI Qiang4, HE Zhen1()   

  1. 1 Hunan Academy of Forestry, Changsha 410004
    2 Yongzhou Forestry Bureau, Yongzhou, Hunan 425300
    3 Central South University of Forestry and Technology, Changsha 410004
    4 Liuyang Forestry Bureau, Liuyang, Hunan 410399
  • Received:2025-04-28 Revised:2025-09-10 Online:2025-11-05 Published:2025-11-07

Abstract:

To systematically study the tolerance of pine wood nematodes (Bursaphelenchus xylophilus) isolated from artificially cultivated and infected wood to high temperature stress, water bath environments at 40, 45, 50, 55, 60, 65 and 70℃ were set up to test the upper survival time limit of the two types of pine wood nematodes at different temperatures, and set a water bath control group at standard room temperature to observe the changes in its activity. The results showed that under low-intensity high temperature stress at 40℃, the longest survival time of both sources of pine wood nematodes could reach 10 days. The tolerance of larvae was significantly lower than that of adults. After being heated continuously for 2 days, the mortality rate of larvae from both sources reached over 99%, but the mortality rate of adults reached 90% only after being heated continuously for 6 days. Under high temperature water bath conditions at 45, 50, 55, 60, 65 and 70℃, the upper survival time limits of pine wood nematodes isolated from artificially cultivation and infected wood were the same, both being 180 minutes, 15 minutes, 3 minutes, 2 minutes, 70 seconds, and 50 seconds, respectively. The high temperature tolerance of pine wood nematodes isolated from infected wood was stronger than that of artificially cultivation, but their upper survival time limits were consistent, with no significant difference (P>0.05). This study indicates that under heat treatment conditions of 55-70℃, the upper survival time limit of pine wood nematodes is 50 seconds to 180 seconds, providing a scientific basis for heat treatment and microwave radiation treatment of infected wood.

Key words: Bursaphelenchus xylophilus, high temperature stress, tolerance, safe disposal of infected wood, microwave pest control treatment