RESPOSTA AGRONÔMICA DE MANEJO QUÍMICO E BIOLÓGICO DE Heterodera Glycines e Pratylenchus brachyurus EM SOJA

Abstract

The objective of this work was to evaluate the phytosanitary and economic efficiency of chemical and biological nematicides on the nematode nematodes (Heterodera glycines) and nematodes of the root lesions (Pratylenchus brachyurus). The experimental design was a randomized block design. Two soybean cultivars M8372 IPRO and M6972 IPRO were used. Treatments consisted of the following combinations: T1: Avicta® (abamectin + thiamethoxam + fludioxonil + metalaxyl-M + thiabendazole); T2: Avicta® (abamectin + thiamethoxam + fludioxonil + metalaxyl-M + thiabendazole) + Onix® (Bacillus methylotrophicusUFPEDA 20); T3: Avicta® (abamectin + thiamethoxam + fludioxonil + metalaxyl-M + thiabendazole) + Onix® (Bacillus methylotrophicusUFPEDA 20); T4: Avicta® (abamectin + thiamethoxam + fludioxonil + metalaxyl-M + thiabendazole) + Trichodermil® (Trichoderma harzianum ESALQ 1306); T5: Nemat® (Paecilomyces lilacinus); T6: Onix® (Bacillus methylotrophicus UFPEDA 20); T7: Qualit® (Trichoderma asperellum URM5911); T8: Rizos® (Bacillus subtilis UFPEDA 764); T9: Rizos® (Bacillus subtilis UFPEDA 764) + Nemat® (Paecilomyces lilacinus); T10: Rizos® (Bacillus subtilis UFPEDA 764) + Trichodermil® (Trichoderma harzianum ESALQ 1306); T11: Witness; T12: Trichodermil® (Trichoderma harzianum ESALQ 1306). All nematicides were applied via seed treatment. Biological treatments provided a significant reduction of infestation of both H. glycines and P. brachyurus. It is concluded that financially the treatments with the chemical nematicide abamectin + thiamethoxam + fludioxonil + metalaxyl-M + thiabendazole needs a greater financial investment. However productivity does not accompany investment.