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Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (8): 149-156.doi: 10.11707/j.1001-7488.20220815

• Research papers • Previous Articles     Next Articles

Research on Paracarophenax alternatusⅡ. Mobility and Tropism of Female Adults

Junnan Li1,2,Runkai Chen1,2,Yu Fu1,2,Mengling Cai1,2,Bingrong Huang3,Yun Xu1,2,Songqing Wu1,2,Feiping Zhang1,2,*   

  1. 1. College of Forestry, Fujian Agriculture and Forestry University Fuzhou 350002
    2. Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University Fuzhou 350002
    3. Fujian Provincial Bureau of Forestry Pest and Disease Control and Quarantine Fuzhou 350000
  • Received:2022-03-04 Online:2022-08-25 Published:2022-12-19
  • Contact: Feiping Zhang

Abstract:

Objective: The mobility and tropism of natural enemy insects or mites are important factors that affect their biological control effects on pests. Understanding the mobility and tropism of Paracarophenax alternatus, a mite, can provide important basis for scientific evaluation of its biological control potential and formulation of its field protection and utilization methods for biological control. Method: In this study, the translational ability, vertical tropism, ascending ability, phototropism, and Monochamus alternatus adults and eggs tropism of the female adult of P. alternatus were investigated through micro-photography, behavioral measurement and control experiments. Result: The female adult of P. alternatus had strong mobility. In the horizontal direction, the average crawling speed of female adult mites from 0- to 8-day-old was 2.17 cm ·min-1. The 0-day-old female adult mites had the highest crawling speed up to 2.63 cm·min-1, while the crawling speed of the 8-days-old female adult mites was the slowest, with only 1.32 cm·min-1. With the increase of the day-age, the crawling speed showed a significant downward trend; In the vertical direction, the female adult mites had significant upward-crawling habit. The upward-crawling individuals within 1-3 hours were 9.7 times that of down-crawling ones. After releasing mites at the base of bamboo stalk in the wild for 1 to 3 days, the female adult mites ascending to 5, 7, 8 and 9 m and above accounted for 26.75%-41.75%, 18.15%-31.35%, 12.00%-26.95% and 7.30%-20.75% of the total mites, respectively. At the same time, the female adult of P. alternatus showed significant phototaxis and tropism to M. alternatus adult and eggs. In the range of the light intensity from 400 lx to 2 000 lx, the selection rate of the mites to light area was 8.1 times that of it to dark area. P. alternatus' selection rate to M. alternatus male, female and eggs was significantly higher than that of the blank control under the conditions of illumination, shading or M. alternatus illuminated with blank control shaded. Conclusion: The female adult of P. alternatus has strong mobility, upward-crawling habit, significant phototaxis and host tropism. These characteristics are helpful for the mite to efficiently search for the host eggs or gather on the body surface of M. alternatus adults to phoresy in the wild. Hence, it is a biological control factor with great application potential. In future biological control practices, it is recommended to encapsulate the mites in black or dark containers and then release from the base of pine trunks.

Key words: Paracarophenax alternatus, mobility, tropism, Monochamus alternatus, Bursaphelenchus xylophilus

CLC Number: