P-615 - Efficacy of Chemical and Biological Nematicides against Root Knot and Sting Nematodes in Watermelon and Tomato

In agricultural ecosystems, plant-parasitic nematodes are significant pests that affect crop health and productivity. The present study focused on evaluating the efficacy of various nematicides, both biological and chemical, against root-knot nematodes (Meloidogyne spp.) (RKN) and sting nematodes (Belonolaimus longicaudatus) (SN) in Honduras and the State of Florida in the United States in three greenhouse experiments. RKN experiments were done on watermelon (Citrullus lanatus) and tomato (Solanum lycopersicum), and the SN experiment was done on tomato. In Honduras, treatments included biological nematicides (i.e., Pazam, Trichozam) and chemical nematicides (i.e., Nimitz, Vydate, Verango), and in Florida, biological nematicides (i.e., Nemaclean, Double Nickel, Nemakill) and chemical nematicides (i.e., Velum). The variables measured were fresh and dry shoot weight, height, root gall ratings, number of eggs in roots, and second-stage juveniles in soil for RKN, and number of nematodes in soil and rhizosphere for SN.  Results from the Honduras trial showed that Nimitz (Fluensulfone) and Vydate (Oxamyl) were the most effective treatments (P < 0.05), significantly reducing the RKN population. In the Florida trial, Velum (Fluopyram) showed the highest efficacy (P < 0.05) in reducing RKN. No significant reduction in SN was noted for any treatments, but the experiment confirmed that tomato is a good host for SN.