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Resistance of wood preservative-treated Rubberwood to the subterranean termite  [1997]

Nantachai Pongpattananurak Kasetsart Univ., Bangkok (Thailand). Graduate School [Corporate Author]

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This research involved a comparative study of the resistance of treated Rubberwood (Heavea brasiliensis Muell. Arg.) to attack from subterranean termite, Coptotermes gestroi Wasmann (Isoptera : Rhinotermitidae); Rubberwood blocks were treated with five different retentions, boron compound (disodium octaborate tetrahydrate) ranged from 0.11 to 3.28 kg/cubic m and cypermethrin 10EC ranged from 0.001 to 0.166 kg/cubic m. The effectiveness was evaluated by measuring percentage weight loss and estimating the degree of visible damage to wood blocks. After four weeks of forced-feeding laboratory assay, the results indicated that the wood blocks treated with boron compound to retention of 3.28 kg/cubic m, showed a weight loss of 8.77 percent and the wood blocks treated with cypermethrin 10EC to retention of 0.166 kg/cubic m, showed a weight loss of 16.81 percent. Wood blocks treated with boron compound to retention of 3.28 kg/cubic m and treated with cypermethrin 10EC to retentions over of 0.121 kg/cubic m displayed visible surface damage. Toxicity of boron compound and cypermethrin 10EC to termite mortality was visually estimated, wood blocks treated with boron compound to retentions greater than of 2.08 kg/cubic m resulted in 100 percent termite mortality within 4 weeks, however wood blocks treated with all cypermethrin 10EC retentions (0.001-0.166 kg/cubic m) never produced 100 percent termite mortality within 4 weeks. After four months of field exposure to the
active C. gestroi colony in an accelerated field test (nonleaching condition), the wood blocks treated with boron compound to retention of 5 kg/cubic m (7.79 percent weight loss) were resistant to infestation by C. gestroi, these wood blocks displayed hardly visible damage. The wood blocks treated with boron compound to the highest retention of 6.16 kg/cubic m (6.44 percent weight loss) showed the lowest amount of damage. Wood block treated with cypermethrin 10EC to the lowest retention of 0.001 kg/cubic m (5.15 percent weight loss) were protect from C. gestroi infestation. The wood blocks were almost undamaged, and the others wood blocks treated with cypermethrin 10EC to retentions greater than of 0.006 kg/cubic m had a good effectiveness of protection from C. gestroi infestation and the wood blocks were undamaged. This research indicated that Rubberwood treated with boron compound to retention of 6.10 kg/cubic m (1.13 percent BAE) or treated with cypermethrin 10EC to retention of 0.121 kg/cubic m, can be excepted to provide protection from C. gestroi infestation.