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
Abstract
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.
Resumo: Resumo
Texto Completo: HTML
PDF
Complemento: TABLE
1 TABLE
2 TABLE
3 TABLE
4