Yield loss caused by root lesion nematodes
(Pratylenchus neglectus and
P. thornei) was measured using the nematicide aldicarb
(Temik 150GTM) or by correlating yield with initial or
final nematode densities. In 1996, rotation trials (1
P. neglectus and 1 P. thornei)
were established with susceptible and moderately resistant wheat varieties and
resistant barley and triticale varieties. An intolerant oat variety (cv.
Echidna) was planted over all plots in 1997. Nematode densities were
90% (P. neglectus) or 95%
(P. thornei) lower in oat plots following the resistant
triticale (cv. Tahara) relative to the susceptible wheat (cv. Machete). In
1997, a significant, negative correlation between both initial and final
nematode density and yield was obtained. In wheat variety trials (3 sites) in
1997, a significant, negative correlation was also obtained between mean
variety yield and mean final P. neglectus density or
mean P. neglectus multiplication rate. Yield loss of up
to 20% was calculated from the regression. In all trials, cereal
varieties that were more resistant were also more tolerant. In 1996, aldicarb
rate trials (1 P. neglectus and 1
P. thornei) were established to assess the affect of
rate and timing of aldicarb application on yield of 2
susceptible/intolerant wheat varieties (cvv. Machete and Janz). Lower
rates of aldicarb (≤1.5 kg a.i./ha) gave inconsistent nematode control
and did not significantly increase yield. Rates ≥2.5 kg a.i./ha reduced
nematode densities by 70–90%, resulting in up to 23%
greater yield for Machete. The magnitude of yield loss caused by
P. neglectus or P. thornei
determined with or without nematicide was similar between trials.
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