Compatibilidade entre nematoides entomopatogênicos e diferentes extratos comerciais de algas marinhas

Abstract

When considering the toxic damages caused by the excessive use of insecticides, the biological agents, specifically the entomopathogenic nematodes (EPNs), appear as promising alternatives in the insect's control. Other organisms that are being used as alternatives for insect control are marine algae, since, in their ecosystem, they produce self-defense substances against damage caused by pests in their tissues. With this, it’s important to evaluate the possibility of the combined use of chemical pesticides with biological control agents. In the context, the main objetive of this research was evaluating the existence of compatibility between EPNs and different seaweed commercial extract, (Acadian®, SeamelPure® e SuperFifty®). In this research it was made three unifactorial experiments, using a completely randomized design. In these experiments, three seaweed extract products and three nematode isolated ones were used. Each treatment was replicated five times, in which each repetition consisted of a test tube with 2 mL of suspension containing 1500 infective juveniles (IJs) and 15 mL of the diluted product. It was evaluated the feasibility parameters, infectivity about Tenebrio molitor larvae and IJs reproductive after the contact with commercial products. It was verified that the Acadian®, SeamelPure® e SuperFifty® products demonstrated incompatibility with the isolated nematodes used in this experimente, because they demonstrated a high mortality rate of infective juveniles, low nematode reproduction and insecticidal effect values greater than 99% in all isolates.