Soil disinfestation with dimethyl disulfide (DMDS) to control Meloidogyne and Fusarium oxysporum f. sp radicis-lycopersici in a tomato greenhouse

摘要

The efficacy of a soil disinfectant, dimethyl disulfide (DMDS), was assessed in a commercial greenhouse with a 12-year history of root-knot nematode infestation. Two trials were carried out over two consecutive crop cycles. Two doses of DMDS (400 L ha(-1) and 600 L ha(-1)) and two plastic covers, VIF (virtually impermeable film) and PE (transparent polyethylene), were tested and compared with two controls: a commercial reference (1,3-di-chloropropene with PE film, 120 L ha(-1)) and untreated (without plastic cover). The results showed a significant reduction in nematodes of the genus Meloidogyne J(2) after soil disinfestations, until 151 and 124 days after treatment (DAT) for the first and second crop cycles, respectively. At the end of the tomato crop, the root galling index was lower for DMDS treatments as compared to untreated, for both trials. All treatments containing DMDS significantly decreased the soil populations of F. oxysporum. Phytotoxicity on tomatoes was not observed after two weeks of soil aeration to allow both ventilation and gas dissipation after DMDS applications.