Chitin and Paecilomyces Lilacinus for Control of Meloidogyne arenaria
Keywords:Biological Control, Mucopolysaccharides, Organic Amendments, Soil Enzymes, Root-Knot Nematodes
AbstractSoil infested with Meloidogyne arenaria was amended with chitin at rates of 0, 0.1, 0.2, 0.4, 0.8, and 1.0% (w/w). Rice colonized with Paecilomyces lilacinus was also added to the soil at 1, 2, and 5 g/kg soil to have all possible combinations of rates for the 2 materials. The treated soils were kept moist for 2 wk and were then planted with squash (Cucurbita pepo) seed. After 6 weeks, the squash was removed and the soils were replanted with 4-wk-old tomato (Lycopersicon esculentum) seedlings. The tomatoes grew for an additional 6 wk before the experiment was terminated. The number of galls/g of root (GR) in squash was not affected by the P lilacinus treatments: however, GR values increased for soils treated with 0.1-0.8% chitin. P lilacinus and chitin amendments reduced GR values and the number of juveniles/g tomato roots. Results indicate that combinations of chitin and P lilacinus amendments are effective for control of M. arenaria.