科研之友
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摘要
In Hawaii, reniform nematode, Rotylenchulus reniformis, damages many agricultural crops and disrupts plant trade because of the regulations imposed against this pest by the state of California and other national and international markets. Nurseries in Hawaii must follow strict certification requirements to export potted plants to these markets where R. reniformis is not established. Mined volcanic cinder, utilized as a potting medium, may contain reniform nematode and needs to be disinfested for use by nematode certified nurseries. Two steam treatment systems of different capacities were evaluated for their efficacy to disinfest the cinder of R. reniformis. The low capacity system consisted of a portable steam generator connected to a steam cart with a media volume of 1.68 m(3). The large capacity system consisted of a dump truck bed modified with an intake manifold and steam distribution pipes connected to a large capacity steam generating boiler to sterilize a 24.5 m(3) load of media. Packets of nematode-infested cinder containing R. reniformis-infested roots of Ipomoea batatas were buried in various locations and different depths in the cinder contained in the two steaming systems. Temperature probes were placed inside or adjacent to the packets and observed during the sterilization process. The steam did not penetrate and distribute in the medium at a consistent rate in both steaming systems resulting in cold spots. These were identified and monitored to ensure that treatment time was sufficient to reach target temperature throughout the medium mass. Once the steam was evenly distributed both systems were successful at eradicating all live R. reniformis.
- 出版日期2012-12
