Abstract
This study aimed at evaluating the effect of the use of disinfectants and insecticides recommended for the control of pathogens and insects in poultry houses on the biological parameters of the entomopathogenic fungus Beauveria bassiana strain Unioeste 4. Disinfectants and insecticides were used at recommended concentration (RC), half the recommended concentration (0.5 RC), and twice there commended concentration (2RC). All treatments were sprayed on the fungus previously inoculated on PDA culture media. Germination, colony forming unit (CFU), vegetative growth and conidial yield were evaluated. Germination was the most affected parameter by insecticides, with reduction of up to 25% using Couro Limpo and Cypermil products. Cypermil also reduced the vegetative growth in all tested concentrations. Conidial production was reduced when products were used at the highest concentration. On the other hand, the confirmed mortality of the lesser mealworm by the fungus was not affected by none of the tested products. All disinfectants at the highest concentration reduced germination and conidia production, but did not affect fungus vegetative growth. The confirmed mortality by the fungus was most influenced by the product TH4. All tested products tested were considered compatible with the fungus.
Highlights
The intensive production of broilers is characterized by the confinement of large numbers of individuals in a small area, which provides high productivity
Commercial disinfectants and insecticides registered for poultry house application were used at the concentration recommended by the manufacturer (RC), half the recommended concentration (0.5 RC), or twice the recommended concentration (2RC) (Table 1)
Beauveria bassiana isolate Unioeste 4 was obtained from culture collection of Laboratório de Biotecnologia Agrícola da Unioeste
Summary
The intensive production of broilers is characterized by the confinement of large numbers of individuals in a small area, which provides high productivity These houses, together with the presence of organic waste (from feed and feces), provide favorable shelter, temperature, light, and moisture conditions for the development of large populations of the lesser mealworm (Alphitobius diaperinus Panzer) (Coleoptera: Tenebrionidae) and sources of the inoculum of Salmonella. These can reduce flock productivity and damage the health of animals and of the humans involved in the production chain, including consumers.
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