Preliminary study on the latent infection characteristics of pine wilt disease
In order to explore the latent infection characteristics of pine wilt disease caused by pine wood nematode(PWN)Bursaphelenchus xylophilus,the survery of Pinus massoniana trees in the epidemic areas of Suichang County,Zhejiang Province were carried out in November 2022 and November 2023,respec-tively.A total of 407 P.massoniana in 8 sub-compartment were sampled during two years sampling,and the molecular detection of PWN results revealed that among the trees identified as normal ones in the field survey,26.15％and 28.57％were found to be infected with PWN,respectively.These pines were in-distinguishable from healthy trees in appearance,but have latent infestation characteristics.The spatial dis-tribution of the latent infection pine trees was analyzed,and the result showed that the spatial distribution of latent infection pine trees was random,and newly infected pine trees were often adjacent to the origi-nal latent infected pine trees,indicated that the latent infected pine trees were infectious.During the two years of continuous investigation,4.73％and 4.05％of healthy P.massoniana changed into latent infected P.massoniana and susceptible P.massoniana,respectively,revealed that not all infected pines have to go through the latent infection stage.Among the 103 latent infected pines in 2022,only 14.56％of them turned into susceptible pines in 2023,and the rest still showed no obvious symptoms,indicated that there were individual differences in the latent time.The results of this study show that latent infection of pine wilt disease is widespread in the stand,which can not be accurately identified by the naked eye alone.And pines with latent symptoms,if not be identified and controlled in time,will become the source of transmission of pine wilt disease outbreak again.
pine wilt diseasePinus massonianalatent infestationtransmission characteristicsSuichang County
NETL
NSTL
万方数据
