Soil amendments with Streptomyces lydicus WYEC108 and chitin against the northern root-knot nematode, Meloidogyne hapla Chitwood, on tomato

摘要

Actinovate (R) SP and Actino-Iron (R), two commercial formulations of the antagonist streptomycete strain Streptomyces lydicus WYEC108, were first tested singly or in combination with chitin against Meloidogyne hapla juveniles in a plant-less test. The best nematicidal treatment was the joint application of Actinovate and chitin at 1.0% (w/w), which significantly reduced by 95% the mean number of M hapla as compared with the control. In two glasshouse bioassays, the joint application of Actinovate and chitin at 1.0% was again the best treatment and reduced the mean number of infective juveniles per pot by 73% (trial 1) and 98% (trial 2) compared with the control. This soil treatment also reduced the mean number of galls per pot by 81% (trial 1) and 99% (trial 2) compared with the control. However, the high variability and high costs of these soil treatments are major obstacles for them to become viable alternatives for the management of M. hapla on tomato.