Ação do fungo Arthrobotrys cladodes como controlador biológico de nematódeos gastrintestinais de ovinos.

Abstract

Gastrointestinal helminths occupy a prominent place among the factors that interfere in the small ruminant productive chain. Among the promising control alternatives, the use of nematophagous fungi stands out. The present master's dissertation consists of two chapters, in which the first is a literature review related to the biological control theme by nematophagous fungi; and the second is a scientific article that aimed to evaluate the efficiency of isolates of the fungus Arthrobotrys cladodes (CG 719) in the biological control of gastrointestinal nematodes in sheep. In the in vitro test (experiment 1), 30 Petri dishes were used, divided into two groups: treated and control. The treated group consisted of 15 plates, where 10 pellets and 2000 infective sheep larvae were spread on each plate. In experiment 2, two groups were formed (treated and control) with six sheep each. The animals in the treated group received 10g of the formulation pelleted with the fungus and after 12, 24, 36, 48, 60 and 72 hours after administration, the animals feces were obtained. Larval reduction of 72.3% was found in the in vitro test, after seven days of interaction of the larvae with the fungi. In test A, there was a significant larval reduction (p <0.01), with a reduction of 83.5%. In trial B, there was a statistically significant difference (p <0.01) in the number of larvae recovered from cocultures, with a reduction of 72.4%. It was concluded that A. cladodes pelleted in a sodium alginate matrix was able to prey on larvae and survive the passage through the gastrointestinal tract of sheep.