Efeito de Inseticidas Neonicotinóides sobre a Mosca-das-Frutas Sul-Americana Anastrepha fraterculus (Wiedemann) (Diptera: Tephritidae) na cultura da Videira

Aline Nondillo, Odimar Zanardi, Ana Paula Afonso, Augusto J. Benedetti, Marcos Botton


South American fruit fly Anastrepha fraterculus (Wiedmann) is one of the most important pests associated with vineyards, mainly with table grape. Insect control has been done basically with organophosphorus insecticides (fenthion, fenitrothion or trichlorfom) that have a high pre-harvest interval, low selectivity to natural enemies and high toxicity to human. This study was conducted aiming to evaluate in laboratory and in a commercial vineyard the effect of the neonicotinoid insecticides acetamiprid (4; 6 e 8 g.100L-1) and thiamethoxam (5; 7.5 e 10 g.100L-1) compared with the organophosphate fenthion (50 mL.100L-1) on adult and larvae control of A. fraterculus. In laboratory, the insecticide fenthion caused 100% of adult mortality by contact and ingestion activities. Similar result was observed to A. fraterculus larvae inside Italia cultivar grapes. Thiamethoxam (10 g.100L-1) showed 79.5% of adult mortality by contact and 100% by ingestion, however, did not caused a significant larval mortality (between 44.4 e 55.6%) inside berries. Acetamiprid controlled the adults by ingestion (100% of mortality). The contact activity of acetamiprid was low (between 23.1 and 25.6% of mortality); however, the larval control (between 77.8 and 88.9% of mortality) was equivalent to fenthion. In the field experiment conducted in a commercial vineyard, all insecticides and doses after four applications (10 days interval) reduced berry damage at levels next to 90% during the harvest. These results showed the potential of neonicotinoids insecticides to control A. fraterculus in vineyards.

KEYWORDS - Chemical control, table grape, acetamiprid, thiamethoxan, fenthion.

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