| Bursaphelenchus xylophilus can be spreaded through two ways: long distance man-made spread and short distance insect-media spread. So the occurance and damage of the nematode have close relation with insects-media. Monochamus alternatus Hope was one the most important pine pests in Asia.In recent years, the researches show that some kinds of volatile substances, which comprise 11 single terpenes and many kinds of andanaerobic zymolysis resultant can be obtained from felled pines.Volatile scent of pine had an effect upon environmental orientation of adult host-seeking, supplement of nutrition and oviposition. Baced on the attractive effect, M — 99 attractant was developed by the Forest pests and diseases control and Quarantine Station of Zhejiang province and the Research Institute of Subtropical Forestry, Chinese Academy of Forestry.In the article, the attractant traps were placed different locations in forest to compare the effects of M—99 attractant, in order to find the most effective location and to forecast the Monochamus alternatus Hope density by recatch rate calculation. Luring effect and trapped adults were compared in different locations i.e. the mountain ridge, the mountainside and the base of mountain. The ability of Monochamus alternatus Hope's diffuseness outside the forestry and the farthest effective distance of M—99 attractant were found out through the entrapping experimentation that different interval attractant traps were placed;the change of luring effect in the luring process were studied through compare affection under different environmental factors, such as temperature, humidity etc.The results as follows:1. Comparison of luring effect on different location and calculation of population density in the forestryAttractant traps were set on the four different locations around releasing spot and adults were recatched, which show that recatched quantities vary with trap location, airflow and the denseness in the forestry. Besides, the experimental field was located in Pinghu, adjacent to Hangzhou bay, often windy with more than force three ( 3.5metre/sec), which had a great effect to the free activity of adults and consequently the trapped and reclaimed adults from the eastern were more than the others. The statistic anlysis show: reclaimed rate was 5.6 percent. According to the Lincoln-Petersen Model, mended as N=[(nl+l)(n2+l)/(m2+l)]-l, population density was calculated, and the result is N,=929. 43, by the creditable range of 929. 43 + 114. 05, N2=850. 70, by the creditable range of 850. 70 + 95. 17, and therefore N=890. 01 +104. 61. It was studied that M—99 attractant was most effectible in less than 70m in distant, and 1 trap can effectively cover in the area of 1.5hm2, so the population density should be speculated 148.34±17.44 adults per hectare.2. Luring effect and trapped adults were compared in different locations such as the mountain ridge, the mountainside and the base of mountain.The traps were placed on the mountain ridge, the mountainside and the base of mountain during the adult outbreak, which indicates that there was no significant difference in quantity between mountain ridge and the mountainside, but the occurrence and retreat stage in the mountainside were a litter earlier. Adult quantity on the base of mountain show a big significant difference compared with the two other positions. The adult quantity on female and male were no significant difference on the mountain ridge and the mountainside, also the total quantity on female and male during the adult occurring stage.3. Setting the traps out of the forestry at 30m, 50m, 80m, 100m, 120m intervals and inspecting the adults activity and finding out the longest effectible distance of M—99 attractant.The traps were set in Dongshan Fuyang municipal, which located on 30m, 50m, 80m, 100m and 120m out of forestry. The results indicated that there were no adults trapped on the outbreak stage except small amounts of adult recatched on 30m's position.4. The environmental influence to adults attracting and attractant volatility. The change of the attractant effect when the time processive, establishment of the optimal intervals of adding attractant.The attractant volatility increased with temperature and wind , and the intervals of adding attractant shortened consequently, which show a close connect with environment, In general, 200ml attractant show little effect after 8 days compared with CK andneeded to add attractant.On the lower temperature condition, attractant was less volatilized. However, it show a tendency of that the trapped adults decreased with the time. |
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