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Abstracts - Rândilla Santos

AN UNUSUAL MALE-SPECIFIC COMPOUND PRODUCED BY THE COCONUT WEEVIL Amerrhinus ynca Sahlberg (COLEOPTERA: CURCULIONIDAE)

Rândilla Santos1* , Palmira Neta2 , Caroline Pagane2 , José Inácio Moura3 , Diogo Vidal4 , Daiane Szczerbowski1 , Paulo Zarbin1 and Carla Fávaro2

1Federal University of Paraná, Curitiba, Paraná, Brazil; 2State University of Santa Cruz, Ilhéus, Bahia, Brazil; 3Cocoa Research Center (CEPEC)/CEPLAC, Una, Bahia, Brazil. 4Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. *

Correspondence: randillacordeiro@gmail.com

The leaf rachis borer, Amerrhinus ynca Sahlberg (Coleoptera: Curculionidae) is a Brazilian endemic pest which attacks palm trees, and the coconut culture (Cocos nucifera L.) is one of its host species. Due to the periodicity and intensity of its attack, A. ynca has been highlighted in the Bahia State, where the largest coconut plantation in this country is found, causing a reduction of productivity and large economic losses. So far, there are no registered insecticides or efficient techniques for control of this weevil.1 Thus, this work aims to extract, identify and synthesize the pheromone produced by A. ynca, in order to provide a method for monitoring and/or control this pest. For this, the insects were collected, separated by sex, reared in plastic cages under ambient conditions of temperature, humidity and photoperiod. The volatile compounds released by males and females were collected by the aeration process and extracted with hexane. The extracts were then analyzed by GC-FID, and the comparison of the chromatograms showed a male specific compound. CG-MS and CG-FTIR analysis allowed to propose the chemical structure as octadecanal, which was confirmed by coinjection with synthetic standard. Olfactometer bioassays and GC-EAG analyzes are underway to verify the bioactivity of both the natural male-specific extract and the synthetic octadecanal. After confirmation of the bioactivity of the synthetic compound, field tests will be performed.

 

Ref. 1. Moura, J.I.L., Manejo Integrado das Pragas das Palmeiras. CEPLAC/ESMAI, 2017, 186p.