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自1982年秋南京近郊发现松材线虫(Bursaphelenchus xylophilus(Stelnerand Burher)Nickle为害以来,累计已枯死黑松5万余株.本病在日本为赤松、黑松林的毁灭性病害.Kobayashi在Hikigawa观察严重受害10年生黑松死亡率的年变化如表1.发病后3—4年死树占全林70%,第7年即全林复灭.南京六·一工地一万余株25年生黑松,1982年发现此病,到1984年死树即占全林60%.松材线虫一生经过卵、幼虫(共四龄)和成虫三个阶段.雌成虫体长960—1310微米,雄成虫体长910—1190微米.交尾后,每雌产卵约100粒.完成一代所需日数:15℃时为12天,20℃时6天,25℃时4天)9.5℃停止发育,超过30℃发育受阻.
Since the discovery of the Bursaphelenchus xylophilus (Stelnerand Burner) Nickle in the suburbs of Nanjing in the autumn of 1982, more than 50,000 dead black pine have been accumulated, which is a devastating disease of Japanese pine and black pine forests. Kobayashi observed severe injuries in Hikigawa Annual mortality of 10-year-old black pine is shown in Table 1. After the onset of 3-4 years dead trees accounted for 70% of the total forest, the first seven years that is, the whole forest collapsed Nanjing six one site more than ten thousand strains 25-year-old Pinus thunbergii, The disease was found in 1982, dead trees accounted for 60% of the total forest in 1984. Pine wood nematode through eggs, larvae (a total of four age) and adult three stages. Female adult body length 960-1310 microns, male adult body length 910-1190 microns after mating, about 100 eggs are laid per female, the number of days required to complete the generation: 12 days at 15 ° C, 6 days at 20 ° C, 4 days at 25 ° C) Stages of development at 9.5 ° C, development at 30 ° C Blocked