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Survival of the nematode-antagonistic fungus Verticillium lecanii in alginate prills



Survival of the nematode-antagonistic fungus Verticillium lecanii in alginate prills



Nematologica 42(1): 114-123



Strains of the fungus Verticillium lecanii have been incorporated into alginate prills and studied as potential management agents for plant-parasitic nematodes. Since long-term storage is essential in material intended for field applications, the viabilities of two V. lecanii strains in prill formulations were recorded after storage in the freezer (-15 degree C), refrigerator (4 degree C), ambient room conditions (ca. 25 degree C), and glasshouse (15-43 degree C). In a wheat bran formulation, both strains generally grew from 90%-100% of prills stored in the refrigerator for up to 43-45 months (although one batch of the mutant strain lost viability by 12 months). Viability at -15 degree C did not always remain as high as when prills were stored at 4 degree C. Viability of both strains was 0% within 2 years at ambient room conditions and within 7 months in the glasshouse. Similar results were obtained with the mutant strain in a pyrophyllite formulation. One batch of wheat bran prills made with the mutant strain plus soybean cyst nematode sex pheromone (vanillic acid was also tested. Fungus viability was 0% after 25 months (freezer, refrigerator), 4 months (ambient room conditions), and 1 month (glasshouse). Fungus in prills made with the pheromone analogue syringic acid had a similar longevity to fungus in prills without added pheromone.

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Accession: 002973166

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DOI: 10.1163/187529296x00120


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