Uso do óleo de nim (Azadirachta indica A. JUSS) e de mamona (Ricinus communis L. ) no tratamento da madeira de sumaúma (Ceiba pentandra (L.) Gaert.) à cupins xilófagos.

Abstract

The research aimed to the efficiency of neem (Azadirachta indica) and castor oil plant (Ricinus communis) oils and weathering effect to improvement of Ceiba pentandra wood resistance to Nasutitermes corniger xilophogous termite. Wood samples with compatible dimensions to each resistance assay to termites were treated to reach a nominal retention of 10 to 16 kg of solution/m³ of wood. The treated samples was submitted to the weathering test and submitted to termites action. The neem and castor oil plant oils little contributed to improvement of Ceiba pentandra wood resistance to xylophogous termites. Among the tested solutions, the pure castor oil plant oil was more efficient. The weathering test of samples (volatily and leaching tests) little influenced the wood resistance. The neem and of pure castor oil plant oils and prepared solutions with the same, same presenting some repulsive effect to termites, their effect are not durable, indicating that the same ones should not be used in wood treatment in order to improve its resistance to xylophogous termites.