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Publication
Compostos voláteis de frutos de Rubus idaeus L. e sua utilização como atrativos na captura da Drosophila suzukii
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Advisor(s)
Abstract(s)
O setor de atividade correspondente aos pequenos frutos é um dos que mais
contribui para as exportações portuguesas. Em 2018, o valor exportado de framboesas
ultrapassou os 164 milhões de euros. Uma das pragas mais importantes e com maior
impacto para a produção de pequenos frutos é a Drosophila suzukii. Neste contexto, este
trabalho teve como objetivo caraterizar os compostos voláteis da framboesa (Rubus
idaeus var. Amira) e avaliar a sua atração em D. suzukii.
Os compostos voláteis foram isolados de framboesas inteiras, por microextração
em fase sólida (SPME) e por hidrodestilação. O α-pineno, o α-felandreno e a α-ionona
foram os componentes dominantes nos voláteis isolados por SPME. No óleo essencial,
obtido por hidrodestilação, os componentes maioritários foram a trans-β-ionona e a
α-ionona. A composição volátil mostrou semelhanças com o referido na literatura para
estes frutos.
Para avaliar o poder de atração e seletividade destes compostos em D. suzukii,
realizou-se um ensaio de campo numa plantação de framboesas com 5 iscos diferentes
em armadilha Lasa Os iscos utilizados foram: (i) hidrolato (água destilada muito
aromática obtida durante a hidrodestilação), (ii) água de decocção resultante da
hidrodestilação das framboesas, (iii) vinagre da Mendes Gonçalves (fabricado
propositadamente pela empresa e que é utilizado habitualmente pelos produtores), (iv) o
hidrolato em conjunto com o vinagre (v) e a água de decocção em conjunto com o vinagre.
Os resultados do ensaio demonstram que a armadilha menos eficaz foi a que utilizou só
o hidrolato. A armadilha que utilizou a água de decocção em conjunto com o vinagre da
Mendes Gonçalves, foi a que capturou mais insetos nos três tuneis, e nas três semanas
que durou o ensaio.
Volatile compounds of Rubus idaeus L. and their use as attractants in the capture of Drosophila suzukii The berries market is very important for Portuguese exports. In 2015, the exported value of raspberries exceeded 85 million euros. One of the most important and impacting pests for berries production is Drosophila suzukii. The present study aimed at characterizing raspberry (Rubus idaeus var. Amira) volatile compounds and to evaluate their attraction in D. suzukii. The volatiles were isolated from intact raspberries by solid phase microextraction (SPME) and by hydrodistillation. α-Pinene, α-phellandrene and α-ionone were the dominant components isolated by SPME. trans-β-ionone and α-ionone were the main essential oil compounds. The volatile composition showed similarities with that reported in the literature for these fruits. To evaluate the attractiveness and selectivity of these compounds in D. suzukii, a field trial was carried out in a raspberry plantation with 5 different baits in a Lasa trap. The baits used were: (i) the hydrolate (highly aromatic distilled water obtained during hydrodistillation), (ii) the raspberry decoction water, (iii) Mendes Gonçalves vinegar (produced on demand by the company and commonly used by producers), (iv) the hydrolate in combination with the vinegar (v) the decoction water in combination with the vinegar. The least effective trap was the one that used only the hydrolate. The trap that used the decoction water in combination with Mendes Gonçalves vinegar, was the one that captured the largest number of insects in the three tunnels and in the three weeks of the trial.
Volatile compounds of Rubus idaeus L. and their use as attractants in the capture of Drosophila suzukii The berries market is very important for Portuguese exports. In 2015, the exported value of raspberries exceeded 85 million euros. One of the most important and impacting pests for berries production is Drosophila suzukii. The present study aimed at characterizing raspberry (Rubus idaeus var. Amira) volatile compounds and to evaluate their attraction in D. suzukii. The volatiles were isolated from intact raspberries by solid phase microextraction (SPME) and by hydrodistillation. α-Pinene, α-phellandrene and α-ionone were the dominant components isolated by SPME. trans-β-ionone and α-ionone were the main essential oil compounds. The volatile composition showed similarities with that reported in the literature for these fruits. To evaluate the attractiveness and selectivity of these compounds in D. suzukii, a field trial was carried out in a raspberry plantation with 5 different baits in a Lasa trap. The baits used were: (i) the hydrolate (highly aromatic distilled water obtained during hydrodistillation), (ii) the raspberry decoction water, (iii) Mendes Gonçalves vinegar (produced on demand by the company and commonly used by producers), (iv) the hydrolate in combination with the vinegar (v) the decoction water in combination with the vinegar. The least effective trap was the one that used only the hydrolate. The trap that used the decoction water in combination with Mendes Gonçalves vinegar, was the one that captured the largest number of insects in the three tunnels and in the three weeks of the trial.
Description
Keywords
SPME Hidrodestilação Iscos Armadilha lasa hydrodistillation baits Lasa trap
Citation
Venda, A.F.; Figueiredo, A.C.; Godinho, M.C. (2022). Compostos voláteis de frutos de Rubus idaeus L. e sua utilização como atrativos na captura da Drosophila suzukii. VI Colóquio Nacional da Produção de Pequenos Frutos. Oeiras, 21 e 22 de maio 2021. Actas Portuguesas de Horticultura, 35, 253-261.
Publisher
Associação Portuguesa de Horticultura