INFLUENCE OF PINEWOOD NEMATODE (NEMATODA, APHELENCHOIDIDAE) INFECTIONON THE PREFORMED DEFENSIVE RESPONSE OF SHORTLEAF PINE

The effect of pinewood nematode, Bursaphelenchus xylophilus (Steiner & Buhrer) Nickle, infection on the preformed defensive response of shor tleaf pines, Pinus echinata Miller, near Ashland, MO, was quantified d uring 1993 and 1994. Each year, trees were inoculated with pinewood ne matodes at a height of approximate to 8m above the ground. An equal nu mber of control trees were inoculated with sterile, distilled water. O leoresin flow was monitored on each tree 1, 2, and 3 mo after inoculat ion. Oleoresin was collected from 2 wounds at each of 3 collection hei ghts; approximate to 1.5, 4, and 7 m above the ground. Significant red uctions in oleoresin flow were noted in the nematode-inoculated trees during both years and at each collection height.