Effects of the Ethanol Extracts of Leaves and Branches from
Four Species of the Genus Croton
on Tetranychus urticae
Koch (Acari: Tetranychidae)
Wendel José Teles Pontes, José C. G. de
Oliveira, Cláudio A. G. da Câmara, Carla P. O. de
Assis, José V. de Oliveira, Manoel G. C. G.
Júnior, Reginaldo Barros
Abstract
The two-spotted spider mite Tetranychus urticae is one of the principal
agricultural pests, infesting important crops such as cotton, grapes
and tomatoes. In recent years, studies with the objective of using
plant extracts as an alternative pest control are being intensified,
showing to be a promising alternative and attracting the interest of a
growing number of scientists. The present study aimed to evaluate the
residual effect of 1% ethanol extracts of leaves and branches of four
species of the genus Croton (C. rhamnifolius Kunth, C. sellowii Baill,
C. jacobinensis Baillon, C. micans (Baill)) on the spider mite T.
urticae. Leaf disks with the mites were immersed for five seconds in
the extracts. It could be verified that the leaf extract of C. sellowii
caused 69% mortality and the leaf extract of C. jacobinensis was not
toxic to the spider mite. From the experiments it was concluded that
the fecundity of the mites was affected and that the extracts were
repellent at a concentration of 1%.
Key
words
- two-spotted spider mite, botanical acaricide, repellence;
Croton spp.
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