Abstract
This study evaluated the effect of cypermethrin insecticide and disinfectants, both used in the management of poultry houses, on nematode Steinernema arenarium, as well as their effect on the bacterium symbiont of nematode. The IOBC/WPRS methodology proposed by Vainio (1992) was used to study the effect on the nematode. The solution of the product was mixed with 1ml of the nematode suspension in distilled water [2000 infective juveniles (IJs)/ml]. As control treatment, only the suspension of the nematode was used. After 48 hours, the viability and the infectivity of the nematode on the larvae of Tenebrio molitor were assayed. The effect of products on the symbiont bacterium was also evaluated. Suspension with 108 CFU (colony forming units)/mL were inoculated in culture medium and three paper discs added (control treatment – distilled water, comparison standard – neomycin, and a disc treated with each product) and the growth was evaluated after 24 hours. All the products reduced the viability of S. arenarium, although only the chlorine-based disinfectant caused reduction above 55%. For the infectivity, the chlorine-based product and the insecticide cipermil reduced in 100% this activity and were considered harmful based on E%. All the products affected the bacterial growing.
Highlights
Brazil is currently the second largest producer of chicken meat in the world, and in the year 2019 reached a total production of approximately 13.2 million tons, of which 4.2 tons were destined for export (ABPA, 2020).chicken production still faces many challenges and has not significantly grown in the last three years (Ibid, 2020)
This study evaluated the effect of cypermethrin insecticide and disinfectants, both used in the management of poultry houses, on nematode Steinernema arenarium, as well as their effect on the bacterium symbiont of nematode
Suspension with 108 CFU/mL were inoculated in culture medium and three paper discs added and the growth was evaluated after 24 hours
Summary
Brazil is currently the second largest producer of chicken meat in the world, and in the year 2019 reached a total production of approximately 13.2 million tons, of which 4.2 tons were destined for export (ABPA, 2020). Larvae and adults of this insect colonize the poultry litter and are ingested by the chickens instead of fodder, affecting the development of the poultry (Despins and Axtell, 1995) They are potential vectors of bacteria pathogenic to poultry and humans (Hazeleger et al, 2008). In addition to the insecticides against the lesser mealworm control, disinfectants for the control of bacteria and other microorganisms are frequently used in poultry sheds. No information is available about the effect on entomopathogenic nematode of the insecticides and disinfectants commonly used in the poultry house This is very important for the future use of nematodes to control A. diaperinus.
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