Observations on the suppression of root-knot nematode (Meloidogyne arenaria) on tomato by incorporation of cyanobacterial powder (Oscillatoria chlorina) into potting field soil.
Experiments were carried out to investigate the nematicidal potential of a cyanobacterium, Oscillatoria chlorina, against the root-knot nematode, Meloidogyne arenaria on tomato plants grown in pots filled with 500 cm3 of field soil infested with 12-s stage juveniles (J2)/cm3 soil. Incorporation of freeze-dried cyanobacterial powder into potted field soil at the rate of 0.2%, 0.4%, 0.6%, 0.8% and 1.0% (w/w) 5 days prior to tomato planting, reduced root galling, final population of M. arenaria and increased vegetative growth of tomato plants and root-mass production, compared with untreated control (P > or = 0.05). The beneficial effect of adding cyanobacterial powder into infested potted field soil increased exponentially with concentration up to 0.8%. Root galling and nematode population decreased by 68.9% and 97.6%, respectively at the highest dose (1%) of cyanobacterial powder compared with the untreated control. Addition of cyanobacterial powder into infested potted field soil at 5 days before planting was the most effective followed by 2 days before and at the time of tomato planting. We conclude that application rate and timing are important factors in the control of root-knot nematodes with O. chlorina.
Khan
Z
Z
School of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea.
Kim
Y H
YH
Kim
S G
SG
Kim
H W
HW
D000818:Animals; D000969:Antinematodal Agents / Q000378:metabolism; D000458:Cyanobacteria / Q000378:metabolism*; D018551:Solanum lycopersicum / Q000469:parasitology*; D010572:Pest Control, Biological / Q000379:methods*; D012988:Soil Microbiology; D014431:Tylenchoidea / Q000502:physiology*
D000969:Antinematodal Agents