Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: May 1, 2005
Publication Date: August 1, 2006
Citation: Meyer, S.L., Zasada, I.A., Tenuta, M., Roberts, D.P. 2005. Effects of n-viro soil(tm), calcium hydroxide, and a streptomyces sp. on meloidogyne incognita populations on cantaloupe. Phytopathology (Supplement). 95:S70.
A Streptomyces sp. isolate (99-60) and N-Viro Soil(TM) (NVS, an alkaline-stabilized biosolid soil amendment) were studied as potential management agents for Meloidogyne incognita (root-knot nematode) on cantaloupe (Cucumis melo). In in vitro assays, some Streptomyces 99-60 culture broth filtrates contained a toxic compound(s) that reduced M. incognita egg hatch and inhibited activity of second-stage juveniles. In a greenhouse study, application of Streptomyces 99-60 to soil and to cantaloupe seedling roots did not result in reduction of M. incognita egg populations, and combinations of Streptomyces 99-60 with NVS did not enhance NVS activity. In the same greenhouse tests, NVS was applied at two rates: 1% and 3% dry weight amendment/dry weight soil. The 3% NVS application significantly (P < 0.01) reduced numbers of M. incognita eggs on cantaloupe roots compared to all other treatments. The 3% NVS application rate also resulted in the highest accumulation of ammonia in soil and elevation in pH. Efficacy of NVS against M. incognita was associated with the generation of high ammonia levels in soil; egg numbers were not affected when soil was amended with calcium hydroxide to increase pH to the same levels as those recorded with NVS application.