EFFICIENCY AND RESIDUAL EFFECT OF INSECTICIDES APPLIED ON DIFFERENT SURFACES FOR THE CONTROL OF BLATTELLA GERMANICA (LINNAEUS, 1767) (DICTYOPTERA: BLATTELLIDAE)

ABSTRACT

The aim of the present study was to evaluate the efficiency and residual effect of insecticides applied on tiles and slate for the control of Blattella germanica. The experiment was carried out in the Departamento de Fitossanidade, UNESP Jaboticabal, SP, Brazil, (May 3 to August 5, 2007). The population susceptible to chemical control was grown in a nonclimatized room. The treatments were lambda-cyhalothrin (Demand 2,5CS) 10 mL/L (12,5 mg/m²); lambda-cyhalothrin (Icon 5,0 CE) 5 mL/L (12,5 mg/m²); deltamethrin (Deltagard WG) 2 sachets/10 L (12,5 mg/m²); lambda-cyhalothrin (Zeon 50CS) 5 mL/L (12,5mg/m²); deltamethrin (Deltek CS) 5 mL/L (6,25 mg/m²); dichlorvos (DDVP 1000CE) 5 mL/L (250 mg/m²) and a control plot. The experimental design consisted of randomized blocks with four replicates. Insecticides were sprayed with a pressurized sprayer (350 kPa) at a volume of 40 mL/m². After 1h, 10 adult German cockroaches were plotted over the treated area and stayed there for 15 min. They were then transferred to pots for evaluations (0, 1, 2, 4, 24, 48 and 72 h after exposition). Treated plates were kept on shelves to evaluate the residual effect of products 30, 60 and 90 days after application. Data was submitted to analysis of variance and Tukey test. The efficiency was calculated. It was concluded that on the application of insecticides there is no difference between the surfaces in the control of B. germanica. The residual effect was greater on a tiled surface in relation to slate. The insecticides lambda-cyhalothrin and deltamethrin (WG) resulted in sufficient control up to 90 days after the spraying.

KEY WORDS
German cockroac; urban pest management; urban pest control