Journal of Food: Microbiologia, Segurança e Higiene
Acesso livre

Abstrato

Eficácia de Phytolacca dodecandra, Buddleia polystachya e extrato de folhas de Vernonia amygdalina contra a barata alemã ( Blattella germanica ) em condição não controlada

Weldesenbet Beze Kassie*

The present study was conducted to evaluate the efficacy of Phytolacca dodecandra, Buddleia polystachya and Vernonia amygdalina leaf extract against the adult German cockroach, Blattella germanica under uncontrolled condition by comparing control measures. The research consists of three botanical leaf extracts were prepared by three concentration levels (5 g/100 ml, 10 g/100 ml and 15 g/100 ml of water), a positive control (deltamethrin) and negative control (water), were laid out in a randomized complete design with three replications. Total of 330 adult cockroaches were tested. Mortality of cockroaches was recorded after 24, 48 and 72 hours of exposure. Data were analyzed by using SPSS software package version 20.0. The results indicated that all the botanical extract concentrations were significant for cockroaches mortality. The mean mortality count of adult B. germanica was the highest (100) in 15 g/100 ml concentration of P. dodecandra and positive control and the lowest (no mortality) in the negative control was recorded in 24 hours exposure time. Hundred percent (100%) of mortality were recorded by P. dodecandra at 5 g/100 ml after 72 hours, 10 g/100 ml after 48 hours 15 g/100 ml after 24 hours and by B. polystachya and V. amygdalina at 15 g/100 ml after 48 hours. These results were no significant differences with positive control. But, there was significant difference in mortality in both increase in concentration levels and exposure time for all botanicals. Therefore, users use these easily prepared and available botanicals to control/eliminate cockroaches by formulating 15 g/100 ml of water and more concentration levels rather than using of synthetic pesticides to keep environmental pollution.