|Science Cluster||About Us||Top 10||Français|
LHM was significantly (P = 0.05) more toxic to P. penetrans than a mixture of its main VFA components at concentrations of 5% and 10% (vol. VFA or LHM /vol. in buffer). Pratylenchus penetrans was more sensitive to acetic acid than C. elegans, whereas the sensitivity of both nematode species to n-caproic acid was similar.
Individual VFA vary in their lethality to P. penetrans. n-valeric acid was the most toxic (LC95= 6.8 mM), while isobutyric acid was the least toxic (LC95 = 45.7 mM).
Individual VFA did not interact in their toxicity to P. penetrans, and their effects were considered additive. VFA account for the majority of the lethal effect of LHM to P. penetrans under acidic conditions.
Caenorhabditis elegans cannot be used as a surrogate to P. penetrans in toxicity studies using VFA. The efficacy of LHM to control P. penetrans can be evaluated by assessing its VFA content prior to application, and this evaluation is facilitated by the fact that the interaction of individual VFA appears to be simply additive.
See Ontario Farmer article, "Hog
manure lethal to nematodes - Add manure to areas with acidic soil
and it can improve nematode control in potato fields"
© 2012, Organic Agriculture Centre of Canada (OACC)