Different concentrations of phosphine were tested against adults of Sinoxylon anale in de-siccator tests. The mortality was 75%, 85% and 100% at 100, 150, and 200ppm levels of the gas respectively. LC50 is calculated and is 61.73 ppm. In the field trials using infested stacked logs of Subabul, observations were taken about the response of baited insects against dif-ferent doses of phosphine. After 72 hours, samples of wood logs were removed from differ-ent levels of the stack, autopsied. Observations were taken on the effectiveness of phos-phine against different developmental stages of the insect and were found dead indicating a good penetration of phosphine in to the logs. The study indicated that phosphine fumigation can be adopted to cure the infestation of S. anale in wooden logs and products.
