Abstract
The use of biological agents has been intensified in recent years against eggs and larvae of gastrointestinal nematodes as an alternative control method in pasture plant health management, with the concomitant use with antiparasitic drugs still occurring. The aim of this study was to test the in vitro activity of the following antiparasitic drugs: Ivermectin and albendazole against the following nematophagous fungi: Paecilomyces fumosoroseus, Paecilomyces lilacinus and Paecilomyces variotii. The agar diffusion test was performed using an initial concentration of 0.0016g/mL of each drug, after solidification of the culture medium containing the drug concentration each nematophagous fungi was inoculated. The results showed that in a concentration of 80μg/mL, the fungal growth decreased, however, with the concentration of 160μg/mL, there was no fungal growth in both drugs, compared to the control, which indicates an inhibition in the development of the nematophagous fungi studied when they come in contact with ivermectin and albendazole.
Highlights
Gastrointestinal nematode infections are a limiting factor in the animal’s production in raised field systems (Waghorn et al, 2003)
The use of biological agents against eggs and larvae of gastrointestinal nematodes as an alternative control method in pasture cleaning management has been intensified in recent years
At the concentration of 0.08mg.mL–1 and when compared with the control group, ivermectin had an inhibitory effect of 38% when tested in P. variotii, of 62.7% in P. fumosoroseus and of 11.1% in P. lilacinus
Summary
Gastrointestinal nematode infections are a limiting factor in the animal’s production in raised field systems (Waghorn et al, 2003). Several control programs have been developed with the goal of minimizing the side effects of endoparasitoses on ruminant production Among this programs, we can highlight the use of anthelmintic compounds with the aimed of reduction of infective larvae on pasture by decreasing the population of adult parasites in animals. The nematophagous fungi are the most studied microorganisms for this kind of purpose (Graminha et al, 2005; Soares et al, 2014). These fungi live in the soil organic matter, in which they developed a parasitic or predatory relation with nematodes, classified as: Ovicidal, endo‐parasites and predators. Several species of nematophagous fungi that infect the larval forms of parasites on pasture has been reported as
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