Two series of block tests of Pinus sp were treated by dipping them for 1 (one) minute in a solution with 0.015 (w/w) and 0.05 (w/w) of deltamethrin, respectively. In both cases, an average retention of 47 kg/m³ (0.32 l/m) was reached. One part of the block tests remained under laboratory conditions during 9 months, and the other was stored during equal period of time in a theater basement submitted to high levels of temperature and humidity. Afterwards, the block tests were placed on nontreated Pinus baits on the ground at a small construction located in Petropolis-RJ-Brazil (22.32S - 43.11W) and highly exposed to subterranean termites of the species Heterotermes tenuis (Hagen, 1958). The block tests were periodically evaluated on a visual basis and given a grade ranging from 0 to 100 according to their condition of preservation. After four (4) inspections carried out during a 3-year period, the block tests treated with 0.015% of a.i. showed no significant increase in the level of attack, which was only superficial, independently of the aging process. The samples treated with 0.005% of a.i. showed an increase in the level of attack from superficial to moderate (grade 50, especially in relation to those aged under high temperature and humidity levels.

Download document (193 kb)
free for the members of IRG. Available if purchased.

Purchase this document