Effect of Five Concentrations of Aqueous Extracts of Pleurotus ostreatus P. Kumm and Tagetes minuta L. on the Mortality of Two Nematodes in a Laboratory Setting

The nematode attacks affect several plant species of Ecuadorian crops. There are fungi and plants with nematicide ability that have agricultural interest. This study assessed the effect of five concentrations of aqueous extracts of Pleurotus ostreatus and Tagetes minuta on the mortality of Meloidogyne spp. and Panagrellus redivivus nematodes in a laboratory setting. The aqueous extracts were obtained through hydro distillation where concentrations of 0%, 0.5%, 5%, 25%, 50% and 100% were prepared. A wholly randomized single-factor design was used for the P. ostreatus extract and a bifactorial for the T. minuta extract (leaves and flowers). The number of dead individuals was evaluated, and the efficacy and LC50 were determined. T. minuta leaf extract showcased higher nematicide activity against P. redivivus with an LC50 of 8.03 ppm; when applied to Meloidogyne sp., the extract showed nematicide activity with an LC50 of 0.01 ppm. For P. ostreatus extract, the greatest nematicide activity against P. redivivus was an LC50 of 1.22 ppm and nematicide activity against Meloidogyne sp., was an LC50 of 0.01 ppm. The aqueous extract of T. minuta flowers showed low nematicide activity and the aqueous extract of T. minuta leaf showed the best nematicide activity. Keywords: nematicide; Tagetes minuta; Pleurotus ostreatus; Panagrellus redivivus; Meloidogyne sp.