Changes of reducing sugar and mineral nutrient elements in Pinus thunbergii and Pinus massoniana at different stage naturally infected by Bursaphelenchus xylophilus

We have analyzed the contents of reducing sugar and mineral nutrient nutrients in Pinus thunbergii and Pinus massoniana at different Pine wilt disease stage naturally infected by the pine wood nematode Bursaphelenchus xylophilus in P.thunbergii and P.massoniana at different Pine Wilt disease stage naturally infected by the pine wood nematode B.xylophilus conifers.With disease progression, the contents of reducing sugar and nitrogen element decreased in both lodgepole and red pines.The changes in other minerals were inconsistent between the two types of pines.These results indicated that the structural damage caused by nematode infection significantly compromised metabolism, and affected the absorption, movement and utilization of different nutrients in the host plants.