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Advisor(s)
Abstract(s)
A mosca-da-azeitona, Bactrocera oleae (Rossi) é considerada praga-chave na
maioria das regiões olivícolas do mundo. A importância dos estragos varia de forma
considerável, dependendo das condições climáticas da região e do fim a que se destina a
azeitona. Em Portugal, a proteção contra a mosca-da-azeitona assenta fundamentalmente
no emprego de pesticidas contra a fase larvar. Os inconvenientes da luta química
conferem interesse crescente ao desenvolvimento de meios de luta alternativos.
Com o presente estudo pretendeu-se avaliar o impacto da aplicação de caulino na
proteção contra a mosca-da-azeitona e na entomofauna do olival. Assim, em 2017 e 2018,
no início do período de postura do inseto, realizou-se o tratamento com caulino a 3%,
respetivamente a 16 agosto e 2 de agosto. Cerca de quinze dias depois, efetuou-se a
segunda aplicação de caulino a 2%.
A avaliação do impacto da aplicação de caulino sobre a entomofauna, fez-se
recorrendo à técnica das pancadas, efetuada no dia da aplicação após o tratamento (T0),
10 (T10), 20 (T20) e 30 (T30) dias após a primeira aplicação, assim como três semanas
após a segunda aplicação (T60). O material recolhido foi identificado até à ordem,
família, género ou espécie, tendo sido registado o número de predadores e parasitoides.
Os resultados obtidos mostram, diferenças significativas na intensidade de ataque
dos frutos, entre a modalidade onde se aplicou caulino e a testemunha, sobretudo nas
últimas datas de amostragem. Em 2017, a última amostragem apresentou diferenças
significativas entre modalidades (p<0,049). No ano 2018, registaram-se diferenças muito
significativas entre modalidades, para os dois últimos tempos de amostragem (p<0,0034)
e (p<.0001), respetivamente. Observou-se ainda um reduzido impacto da aplicação do
caulino na entomofauna. Apenas se observaram diferenças significativas entre
modalidades, no número total de predadores, na amostragem efetuada imediatamente a
seguir ao tratamento.
The olive fly, Bactrocera oleae (Rossi) is considered a key pest in most of the olive producer regions in the world. Damages importance varies considerably depending on the climatic conditions of the region and the purpose of the olives groves. In Portugal, the protection against the olive fly is based mainly on the use of pesticides for larvae control. The disadvantages of agrochemical use increase the interest for developing alternative control methods. The present study aimed to evaluate the impact of kaolin application on the protection against the olive fly and in the entomofauna of the olive grove. Thus, at the beginning of the oviposition period, treatment with 3% kaolin was performed on August 16 and August 2 in 2017 and 2018 respectively. Three weeks later, a second application of 2% kaolin was performed. The kaolin effect on the entomofauna was evaluated the day after the application (T0) and 10 (T10), 20 (T20) and 30 (T30) days after the first application, as well as 30 (T60) days after the second application. The collected material was identified to order, family, genus or species and the number of predators and parasitoids was recorded. These results showed significant differences in fruit attack intensity between the treatment with kaolin and the control, especially during the last sampling dates. In 2017, the last sampling shows significant differences between treatments (p<0,049). In 2018, there were very significant differences between treatments for the last two samples (p<0.0034) and (p<.0001), respectively. Additionally, a low impact of the kaolin application on the entomofauna was observed being that only the total of predators in T0 showed significant different between treatments.
The olive fly, Bactrocera oleae (Rossi) is considered a key pest in most of the olive producer regions in the world. Damages importance varies considerably depending on the climatic conditions of the region and the purpose of the olives groves. In Portugal, the protection against the olive fly is based mainly on the use of pesticides for larvae control. The disadvantages of agrochemical use increase the interest for developing alternative control methods. The present study aimed to evaluate the impact of kaolin application on the protection against the olive fly and in the entomofauna of the olive grove. Thus, at the beginning of the oviposition period, treatment with 3% kaolin was performed on August 16 and August 2 in 2017 and 2018 respectively. Three weeks later, a second application of 2% kaolin was performed. The kaolin effect on the entomofauna was evaluated the day after the application (T0) and 10 (T10), 20 (T20) and 30 (T30) days after the first application, as well as 30 (T60) days after the second application. The collected material was identified to order, family, genus or species and the number of predators and parasitoids was recorded. These results showed significant differences in fruit attack intensity between the treatment with kaolin and the control, especially during the last sampling dates. In 2017, the last sampling shows significant differences between treatments (p<0,049). In 2018, there were very significant differences between treatments for the last two samples (p<0.0034) and (p<.0001), respectively. Additionally, a low impact of the kaolin application on the entomofauna was observed being that only the total of predators in T0 showed significant different between treatments.
Description
Keywords
Prejuízos Parasitoides Predadores Posturas Técnica das pancadas Research Subject Categories::FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING::Plant production
Citation
Martins, Vanessa Fernandes; Marrão, Rosalina; Bento, Albino (2020). Efeito do caulino na intensidade do ataque da mosca-da-azeitona, Bactrocera oleae (Rossi) e na entomofauna do olival. In 4º Simpósio Nacional de Fruticultura. Faro: Associação Portuguesa de Horticultura. p. 430-437
Publisher
Actas Portuguesas de Horticultura