Table 1.

Effects of metabolites from commercial sources at 48 h corrected death. rate on soybean cyst nematode second-stage juveniles (J2)

Treatment	48 h Corrected J2 death rate (%)
L-methioninea (500 μg/ml)	82.8 ± 0.01
Palmitic acidb (600 μg/ml)	77.8 ± 0.01
4-vinylphenolb (600 μg/ml)	87.9 ± 0.02
Piperinec (1000 μg/ml)	79.9 ± 0.02

Means of twelve replicates with the same letter do not differ significantly (P ≤ 0.05) (the mean of corrected death rate ± SE)

^aL-methionine was dissolved in water and the water as the control

^bPalmitic acid and 4-vinylphenol were dissolved in 3% Tween 80 and 4% ethanol, at the same time 3% Tween 80 and 4% ethanol as the control

^cPiperine was dissolved in 3% Tween 80 and 4% methanol, at the same time 3% Tween 80 and 4% methanol as the control