Volatile profile of quince varieties (Cydonia oblonga Mill.) by damage of codling moth (Cydia pomonella L.)

MARÍA PÍA GOMEZ; BARUD, FLAVIA JOFRÉ; MARÍA LIZA LÓPEZ

Valparaíso

Congreso; 5th Congress of the Latin American Association of Chemical Ecology (ALAEQ); 2018

Asociación Latinoamericana de Ecología Química

Quince (Cydonia oblonga Mill.) is one of the main fruit crops in San Juan province, Argentina. Codling moth (Cydia pomonella L.), a worlwide oligophagous pest generates a great discard of quinces production. The host finding is mediated by volatile compounds released by plants. The fruit profile compounds changes in response to damage by codling moth. The aim of this study was to determine the volatile profile compounds of fruits and leaves at ripening stage, in 6 varieties of quince (Champion, Portugal, Smyrna, INTA 37, INTANDINO 117 and INTA 147). Experiments were conducted at the experimental field of INTA-Pocito (San Juan, Argentina). After the fruit set, branches of the different varieties were protected with fabric bags, to prevent the pest entry. At ripening stage, fruits and leaves of branches exposed and protected of the pest were sampled. Volatile profiles were determined by SPME-GC/MS analyses. Two chemicals groups were observed for the fruits: sesquiterpenes and esters, with 86% and 7% of the average relative area, respectively. In all fruits alpha-farnesene was the main compound, and its content increased in fruits affected by codling moth damage in certain varieties. In leaf samples, the profile was dominated by aldehydes and alcohols, with 54% and 34% of the average relative area, respectively. These results, in a preliminary nature, fill out absent information for quince cultivation and its interaction with codling moth.