| In the first part of the paper, we did our comparative experiments on migrating of the four species of Bursaphelenchus genus by alluring on Botrytis cinerea and Pestalotia pezizoides, that is B.xylophilus(Bx), B.mucronatus(Bm), B. fraudulentus(Bf), B.hofmanni(Bh). Our results showed that: In the same conditions, when cultured on Botrytis cinerea, the ability of Botrytis cinerea to allure nematode was : Bf > Bx > Bh > Bm; the ability of Pestalotia pezizoides to allure nematode was : Bf > Bx > Bm > Bh.In the conditions, we also did comparative experiments on reproduction of the the five species of Bursaphelenchus genus by culturing on Botrytis cinerea and Pestalotia pezizoides, that is B.xylophilus(Bx), B.mucronatus(Bm), B. fraudulentus(Bf), B.hofmanni(Bh), and B.borealis (Bb). The reproduce ability of the five Bursaphelenchus genus was in regulary. For all kinds of the nematodes, After the reproduction quantity of nematodes reacheed the maxrum, with the increase of the culture days, the quantity of the nemotodes had reduced currently. The reproduce quantity of Bm on Botrytis cinerea was more than Bx at the same term.The reproduce quantity of the other 3 species took on disciplinarian changes.The reproduce quantity of the 5 species of Bursaphelenchus genus on pestolotia pezizoides took on disciplinarian variety too. The reproduce quantity of Bh on the Pestalotia pezizoids had the biggest change. The reproduce quantity of Bx reached the maxrum on the 12th day, and Bm 9th. In this experiment, comparing the reproduce quantity of Bm with Bx, Bm took the advantage. The reproduce quantity of the 2 other genus took on disciplinarian changes too. Either of them reached maxrum on 6th. The reproduce ability of Bb was the worst.In the second part of the paper, we investigated the ability of Monochamus alternatus Hope carrying nematode in someplace in X province. In the 5 experiment bases, from May to June , during the two months, we captured 463 Monochamus alternatus, which contained 219 females and 244 males. We caught 235 Monochamus alternatus in A town , which were more than half of all the Monochamus alternatus we caught.We caught 28 Monochamus alternatus in B town, 60 in C town , 10 in D town and 129 in E town. The density of Monochamus alternatus in E town was the highest, because there are many young trees and old trees in this town, some trees are several hundred years old, all of them are very weak.The quantity of Monochamus alternatus reached maxmum from the first ten days of May to the first ten days of June. The quantity of Monochamus alternatus cut down after the middle ten days of June.After anatomised and checked under the microscope, we had a conclusion. For all the Monochamus alternatus that carried Bx, the male carried more Bx than the female.Compared with all the towns, The quantity of Monochamus alternatus carried nematodes was the biggest in A town, the percentageage of Monochamus alternatus carried Bx was the biggest too. The quantity of Monochamus alternatus carried Bm was the biggest in E town. So A town and E town maybe the most important district to father Bx in future.We caught 23 Monochamus alternatus in all the towns, which contained 10 females and 13 males. The quantity of Monochamus alternatus carried Bx was 63,which included 29 females and 34 males. The quantity of Monochamus alternatus carried other nematodes was 57. The The quantity of females which carried Bx was bigger than the males. The males were more easily to carry Bm than the males, and the males had bigger carrying percentageage than the females.The number of Monochamus alternatus reached the maxmum on 9th May in A town , B town and E town , the quantity of Monochamus alternatus reached the maxmum on 9th June in D town. The largest quantity of Monochamus alternatus we captured which carried Bx was on 25th May. The biggest percentageage of Monochamus alternatus carried Bx was 31.25% on 3th May.
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