Preferences of quince (Cydonia Oblonga mill.) varieties by adults and larvae of codling moth (Cydia pomonella L.)

ARIEL DÍAZ; MARÍA PÍA GOMEZ; FLAVIA JOFRÉ BARUD; MARÍA LIZA LÓPEZ

Valparaíso

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

Asociación Latinoamericana de Ecología Química

*Primera autoría compartida..... Cydia Pomonella (L.), known as "codling moth", is a worldwide oligophagous pest of apples, pears, quinces and walnuts. The host finding is mediated by volatile compounds released by plants. The mated female performs recognition and preferences for oviposition guided by olfactory cues while the neonate larvae must find and enter quickly into the fruit; otherwise they would be exposed to unfavourable external conditions. The aim of this study was to determine the preferences of adult females and larvae of codling moth on four varieties of quince (Cydonia oblonga Mill.); Portugal, Smyrna, INTA 147 and Champion. Oviposition trials were conducted for preference of mated females through dual choice assays with two fruits of different varieties placed on acetate cards. After 12 days, the number of eggs and, oviposition marks per card were recorded. Larval preference was assessed through dual-choice bioassay in a Petri-dish. A neonate larvae was placed to choose between each of the four varieties arranged by pairs. The first choice, the time elapsed until fruit contact and, distances traveled by the neonate larvae were recorded. Codling moth's preference for oviposition was higher in Champion variety. Champion and Smyrna were more attractive for oviposition, while in INTA 147, fewer postures were recorded. Preference by neonate larvae was observed towards Champion variety, followed by Smyrna variety. INTA 147 and Portugal were the least preferred by neonate larvae. The results are important in the context of codling moth interactions with quinces and for the cultivation of less susceptible varieties to the codling moth infestation.