Infestation of pine (Pinus sylvestris L.) seedlings with the pinewood nematode Bursaphelenchus xylophilus Steiner and Buhrer (Nickle) through wood sawdust

Table 2 Trial results of pine seedling infestation (Pinus sylvestris) with Bursaphelenchus xylophilus through PWN-infested wood sawdust

Trials	Number of PWN-infested seedlings¹		PWN number in infested seedlings, per 100 g wet weight (M ± S)
Trials	n	%	Sawdust	Stem	Roots
Nematode infestation through the stem
I. Uninjured stem + PWN-infested sawdust	2^ab	17	469 ± 470^a	275 ± 58^a	0
II. Injured stem + PWN-infested sawdust	10^сd	83	378 ± 206^a	3263 ± 2171^b	554 ± 530^a
III. Injured stem + PWN-infested sawdust 2.5 cm away from the stem	0^a	0	1096 ± 847	0	0
Nematode infestation through the roots
Trials	n	%	Soil + sawdust²	Stem	Roots
IV. Uninjured roots + PWN-infested sawdust in the soil	0^a	0	116 ± 78	0	0
V. Injured roots + PWN-infested sawdust in the soil	6^bс	50	237 ± 278^a	715 ± 227^b	376 ± 131^a
VI. Injured roots without sawdust	0^a	0	0	0	0
Control
VII. Control: seedlings without sawdust	0^a	0	0	0	0

Note. n number of plants, M mean value, S standard deviation. Different letters indicate significant differences in the columns (numbers of PWN-infested seedlings, χ² > 5.3, df = 1, p < 0.012) and rows (mean numbers of nematodes, MCR-test: p < 0.003)
¹All B. xylophilus-infested seedlings died at the end of the experiment
²Average number of PWN in soil + sawdust (nematodes/100 cm³)

ISSN: 1297-966X