SPRAYING OF SURFACES WITH DIFFERENT CONCENTRATIONS OF PESTICIDES

Abstract:
Concrete, wood, glass and ceramic tiles were treated with the same quantity of active ingredient applied at different concentrations. The active ingredients, permethrin, alpha-cypermethrin and bendiocarb were used. The formulations were diluted in water. Either 1 litre; 0.6 or 0.5 litre; 0.3 or 0.25 litre of water110 m2 was used for spraying. The treating was done by using the knapsack sprayer without manometer. The nozzle was conical. According to this, 10 m' were sprayed 3 or almost 4 times till one litre of solution was applied. If 0.5 or 0.6 1 of water was used, it was necessary to spray the same surface twice. The same surface was covered 0.9 times or once with 0.25 or 0.3 litre respectively. Also, 1 lime, 0.6 litre and 0.3 litre of water was mixed with the same quantity of bendiocarb and different number of square meters were treated. The initial and the residual action of insecticides after 30 and 60 days was determined. Beside the studies in the laboratory there was some spraying in natural situations. The efficacy was evaluated in the treated buildings as well as in the laboratory, if this was possible. The insects, Sitophilus spp., Rhizopertha dominica and Tribolium spp. were used in the laboratory experiments. The efficacy of the insecticides used in the buildings was evaluated by the mortality of Blatta orientalis L and Blattella germanica (L.).