EARLY SELECTION OF Pinus radiata PROGENIES TO Sphaeropsis sapinea

Abstract

Sphaeropsis sapinea \ue9 um importante pat\uf3geno para Pinus radiata , causando seca de ponteiros e morte de \ue1rvores, em plantios comerciais. Este estudo teve como objetivo selecionar prog\ueanies de Pinus radiata resistentes ao pat\uf3geno. Mudas de 16 prog\ueanies de Pinus radiata foram inoculadas com tr\ueas isolados monosp\uf3ricos do pat\uf3geno, em condi\ue7\ue3o de casa de vegeta\ue7\ue3o. Foram avaliados o comprimento das les\uf5es e o grau de secamento dos ponteiros. Os resultados indicaram que a metodologia de sele\ue7\ue3o precoce foi adequada para selecionar prog\ueanies de Pinus radiata resistentes ao Sphaeropsis sapinea. A herdabilidade m\ue9dia das prog\ueanies variou de acordo com o isolado testado e o crit\ue9rio de sele\ue7\ue3o utilizado.Sphaeropsis sapinea is an important pathogen for some Pinus radiata causing tip blight and death of trees, in commercial plantings. This study was developed to select Pinus radiata progenies resistant to the pathogen, for new plantings in Brazil. Seedlings tips of 16 Pinus radiata progenies were inoculated with three pathogen monosporic isolates of Sphaeropsis sapinea, under greenhouse conditions. Lesions length and tip blight degree were evaluated. Responses of progenies to the pathogen varied according to tested isolate. The results indicated that early selection methodology was adequate to select Pinus radiata progenies resistant against Sphaeropsis sapinea. Average heritability of the progenies varied according to tested isolate and the selection criterion used