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Chapter 4,300

Remedial treatment of preservative-treated cocowood poles

Giron, M.Y.; Garcia, C.M.; San Pablo, M.R.

FPRDI Journal 25(1-2): 71-82

1999


ISSN/ISBN: 0115-0456
Accession: 004299377

The study determined: (a) the effectivity of sodium n-methyl dithiocarbamate (Vapam), methyl-isothiocyanate (MIT-C), trichloronitromethane (Chloropicrin) and disodium octaborate tetrahydrate (fused borate rods) in prolonging the service life of preservative-treated cocowood poles (Cocos nucifera), and (b) the poles' re-treatment cycle. Laboratory test on the effectivity of the chemicals against two species of decay fungi, Fomes lividus and Lenzites striata and a subterranean termite, Microcerotermes losbanosensis was conducted on small blocks taken from the hard portion of cocowood. Field test was done on 120-cm cocowood bolts pressure-treated with chromated copper arsenate (CCA) and applied with fumigants. Generally, the species' average percent survival was reduced, indicating the effectivity of the chemicals and the latter's ability to diffuse from the inner to the outer portion of the blocks. As the fumigants were able to significantly arrest fungal growth only until the third year, remedial treatment on standing preservative-treated cocowood poles should be applied after three years to prevent re-invasion of decay fungi and prolong the poles' service life. The termites did not cause damage on the treated poles but extensively damaged the control.

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