Pasteuria penetrans suppression of root-knot nematode Meloidogyne arenaria race 1 in vegetables

Abstract

This study was conducted to determine the suppressiveness of obligat parasite P. penetrans against the peanut root-knot nematode Meloidogyne arenaria race 1 in vegetable growing site and to find out whether the field site have infested with other root-knot nematode species, causing the suppression to break down. The study were carried out at four vegetable crops grown sites tomato Lycopersicon lycopersicum cv. Bella Rosa, cucumber Cucumis sativus L. cv. Cobra, okra Abelmoschus (=Hibiscus) esculentus (L.) Moench cv. Clemson Spineless and squash Cucurbita pepo L. cv. Golden Summer at the Plant Science Research and Education Unit-Citra, University of Florida, US. The field site was arranged in a split plot design with eight replicates. To determine the effect of 1,3-dichloropropene (1,3-D) on P. penetrans, the split plot was fumigated with 1,3-D (Telone II) at dose of 112 L/ha.. Plant and soil samples were collected from each plot at harvest time. The percentages of M. arenaria race 1 infective juvenile (J2) with endospores attached ranged from 40% to 10%.. Only a very low incidence of M. incognita was extracted from tomato roots galls.. The results indicate that P. penetrans is likely to be one of the important effective agent in the nematode suppression and the reduction M. arenaria race 1 damage.