Novas pragas agrícolas na Ilha de S. Nicolau - Cabo Verde: Tuta absoluta (Meyrick) (Lep.:Gelechiidae) e Bactrocera invadens (Drew, Tsuruta & White) (Dipt.: Tephritidae)

• Author(s): Duarte, Melissa Vanize dos Anjos da Costa
• Date: 2013
• Persistent ID: http://hdl.handle.net/10400.5/6473
• Origin: Repositório da UTL
• Subject(s): Bactrocera invadens; Tuta absoluta; monitoring; mass trapping; deltamethrin
• Document Type: Master thesis
• Language: Portuguese
• Advisor(s): Mexia, António Maria Marques; Oliveira, Elisabete Lacerda de Figueiredo
• Contributor(s): Repositório da Universidade de Lisboa

Description

Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia

In the last two years, invasive species that are pests of agricultural crops were introduced in some of the islands of the archipelago of Cape Verde with a high economic impact in agriculture. These include the South American tomato pinworm, Tuta absoluta (Meyrick) (Lepidoptera: Gelechidae) and Bactrocera invadens Drew, Tsuruta & White (Diptera: Tephritidae). In order to assess the presence of these pests on the island of São Nicolau, attractive traps were settled in four areas with banana trees (Ribeira Prata, Fajã, Maiama and Campo de Preguiça) to monitor the fruit fly. Tests were also installed in six tomato fields for comparison of different strategies for protection against T. absoluta: trap with pheromone sexual mass trapping in conjunction with Bacillus thuringiensis and deltamethrin treatments. Amongst the four areas monitored, B. invadens was only found in the Valley of the Fajã. Tomato plant strata were compared regarding the population of T. absoluta but no significant differences were detected. Attack (number of leaves with mines and fruits with galleries) in the treatments modalities were evaluated. Treatments performed against T. absoluta did not differ significantly. Nesidiocoris tenuis was identified as a natural enemy of T. absoluta present on the island.