N. Kokalisburelle et al., EVALUATION OF POWDERED PINE BARK FOR CONTROL OF MELOIDOGYNE-ARENARIA AND HETERODERA-GLYCINES ON SOYBEAN, Plant and soil, 162(2), 1994, pp. 163-168
Commercially available pine bark nuggets (composted) and fresh pine ba
rk were ground into powders and added at rates of 0 to 50 g kg(-1) to
field soil infested with Meloidogyne arenaria and Heterodera glycines.
The treated soil was maintained moist in the greenhouse for 2 weeks,
sampled, and planted with 'Davis' soybean (Glycine max.). Eight weeks
after planting, numbers of M. arenaria and H. glycines in soil decreas
ed with increasing amounts of composted or fresh pine bark. No juvenil
es were present in soil treated with 5% pine bark. The number of galls
and cysts g(-1) root decreased in proportion to the amount of pine ba
rk added to soil. Gall and cyst formation was completely eliminated at
the 5% rate. Numbers of saprophagous nematodes were highest in soil w
ith 4-5% pine bark. The activity of several soil enzymes was correlate
d with the addition of both composted and fresh pine bark. Fresh pine
bark powder caused an increase in soil enzyme activity compared to com
posted pine bark, but did not provide consistent control of gall and c
yst formation.