Greenhouse and field assessment of biological and chemical agents against guava decline

ABSTRACT Guava decline is a complex disease resulting from the parasitism by Meloidogyne enterolobii (Me), which predisposes plant to root rot caused Fusarium sp. Three in vitro experiments were carried out with aim of: (i) selecting Fluensulfone dosage capable of causing Me mortality; (ii) verifying effect on Pochonia chlamydosporia and Trichoderma harzianum; (iii) evaluating harzianum pure doses association mortality. at 2 L.ha-1 had no fungi. The associated treatments significant A field experiment was also guava orchard where occurred. following tested: Fluensulfone; P. chlamydosporia; + T. Carbofuran, control. All reduced population, since relative efficiency higher than 80%. used alone or combination biological nematicides provided an increase productivity. Maintaining population low important option for increasing productivity reducing losses suffered farmers.