Fresh Conifer Bark Reduces Root-knot Nematode Galling of Greenhouse Tomatoes

in HortScience
John J. McGradyYuma Mesa Agricultural Center, University of Arizona, Route 1, Box 40-M, Somerton, AZ 85350

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Donald J. CotterDepartment of Agronomy and Horticulture, New Mexico State University, Box 30003, Las Cruces, NM 88003-0003

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Experiments were conducted to evaluate the effect of fresh and aged conifer barks on galling by the root-knot nematode [Meloidogyne incognita (Kofoid and White) (Chitwood)] on tomato (Lycopersicon esculentum Mill.) roots. Fresh bark (stored at sawmill) exhibited significant nematicidal activity (reduced galling) when used as a medium component [50% or 75% with sand (v/v)]. Galling on tomatoes grown in aged bark (used as a culturing medium for tomatoes for 5 years) was extensive. When 10% or 20% fresh conifer bark was mixed into beds, galling was less extensive on tomato roots than on roots from tomatoes grown in an unamended medium. The nematicidal property of conifer bark diminished during long-term use. Increases in medium pH, which occurred during continuous cropping, could have contributed to the reduced nematicidal activity with time.

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Received for publication 1 Aug. 1988. Arizona Agr. Expt. Sta. Journal Series no. 7011. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

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