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dc.contributor.authorColoso, R. M.
dc.contributor.authorBorlongan, Ilda G.
dc.contributor.authorBlum, R.A.
dc.date.accessioned2013-11-14T09:47:43Z
dc.date.available2013-11-14T09:47:43Z
dc.date.issued1998
dc.identifier.citationColoso, R. M., Borlongan, I. G., & Blum, R. A. (1998). Use of metaldehyde as a molluscicide in semi-commercial and commercial milkfish ponds. Crop Protection, 17(8), 669-674.en
dc.identifier.issn0261-2194
dc.identifier.urihttp://hdl.handle.net/10862/1733
dc.description.abstractThe effect of metaldehyde on brackish water pond snails, Cerithidea cingulata, was tested in 250 m2 ponds, and in semi-commercial and commercial milkfish ponds. The field trials were conducted at three locations, namely Luzon, Visayas, and Mindanao, Philippines. Three application rates (80, 100, 120 kg(ha) of 10% metaldehyde formulation, an untreated control and a reference standard 25% niclosamide EC (1.0 L/ha) were tested during the dry season in a pond with heavy snail infestation. Seven days after application (DAA), snail mortality rates (86-87%) did not differ significantly among the various metaldehyde treatments but were significantly higher than those in the control (6%) and the reference standard (29%). In the field trials, in heavily infested ponds (more than 2000 snails/m2), a dose of 120 kg/ha was effective under both dry and wet conditions. In moderately infested ponds (less than 2000 snails/m2), a dose of 80 kg/ha of a 10% metaldehyde formulation was effective under dry conditions but a dose of up to 120 kg/ha was needed under wet conditions. In a pond dosed with 120 kg/ha of the 10% metaldehyde formulation, the concentration increased in pond water, until 3 DAA relative to the initial level, indicating that the active ingredient had dissolved from the granules. From day 3, the concentration declined steadily to approx. 16% of the initially detected amount at 15 DAA. In the pond sediment, the metaldehyde concentration steadily declined to approx. 1% of the initially detected amount at 15 DAA. As metaldehyde is rapidly degraded in aquatic systems its efficacy in controlling brackish water pond snails depends on a high initial dosage.en
dc.description.sponsorshipWe thank the following for making this study possible: Lonza Ltd, Basel, Switzerland, for funding this project; ECON Research and Evaluation Concepts for Environmental and Health Safety, GmbH, Ingelheim on Rhine, Germany for analysis of metaldehyde residues; Lucia Jimenez for technical assistance; Jose Cruz and Antonio Aguilar of AgChem Manufacturing Corporation, Manila, Philippines and Joevic Pasit and Adonis Alamban of Jardine Agchem, Philippines for assistance during the conduct of the field trials; Soledad Cruz and Concepcion Mendoza, Department of Agriculture, Philippines, also for assistance during the field trials; and Capiz Institute of Technology (c/o Victor Billanes), Benjamin Jardiolin, Raymundo Cruz, and Joey Maniquiz for allowing us to use their ponds for testing.en
dc.language.isoenen
dc.publisherElsevieren
dc.subjectmetaldehydeen
dc.subjectniclosamideen
dc.subjectsnailsen
dc.subjectChanosen
dc.subjectCerithidea cingulataen
dc.subjectMilkfish pondsen
dc.titleUse of metaldehyde as a molluscicide in semi-commercial and commercial milkfish pondsen
dc.typeArticleen
dc.identifier.doi10.1016/S0261-2194(98)00071-4
dc.citation.volume17
dc.citation.issue8
dc.citation.spage669
dc.citation.epage674
dc.citation.journalTitleCrop Protectionen
seafdecaqd.library.callnumberVF SJ 0566
seafdecaqd.databank.controlnumber1998-33
dc.subject.asfamolluscicidesen
dc.subject.asfatestingen
dc.subject.asfasedimenten
dc.subject.asfabrackish wateren
dc.subject.asfafish cultureen
dc.subject.asfatoxicityen


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