ABSTRACT
The guava crop has been severely attacked by the phytonematode Meloidogyne enterolobii, which has caused drastic reduction in productivity and, in some cases, even the death of all trees in the cultivated orchard. Due to its wide range of potential hosts and easy dissemination, M. enterolobii represents a constant threat and has established itself as one of the major constraints for guava cultivation in Northeast Brazil. The objective of this study was to evaluate the reaction of guava and “araçá” genotypes to M. enterolobii parasitism under greenhouse conditions. Forty-four “araçá” genotypes from natural populations in Pernambuco State were evaluated, as well as six guava genotypes. The genotypes were evaluated according to the following parameters: gall index (GI), reproduction factor (RF), number of eggs per gram of root (OGR) and reproductive factor reduction (RFR). Considering the evaluated criteria, the “araçá” genotypes REC-DI-A02 and REC-DI-A04 had the best results and can be recommended as a source of resistance to M. enterolobii, also constituting promising genotypes for grafting tests in guava.
Keywords
Guava tree; Myrtaceae; Root-knot nematodes; Resistance
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