Effect of Aqueous Extracts from Azadirachta indica and Trichilia pallida on Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) in Maize
Marcos R. Conceschi, Thiago F. Ansante, Fábio Mazzonetto,
José D. Vendramim, Vera L.M. Sossai, Luiz C. Pizetta, Renato Z.
Corbani
Abstract
Insecticidal
plants have been studied
as an alternative to control Spodoptera frugiperda, an important pest on maize. This
work aimed to evaluate the effectiveness of the aqueous extracts from Azadirachta
indica (EAI) and Trichilia pallida (ETP)
on S. frugiperda fed
on maize leaves (hybrid ZB 710) on different forms of application.
Pieces of
leaves (16 cm2) were immersed by 4 seconds
and/or the caterpillars
were sprayed with the extracts at the concentration of 5%, and thus
transferred
to glass tubes and the leaves and/or
caterpillars were replaced every 24 h. The biological variables
assessed were
daily mortality, larval weight, measurements of head capsule width and
lengths at
the 5th day of evaluation. The design was wholly
randomized,
composed by seven treatments (control, leaves immersed in EAI,
caterpillars
sprayed with EAI, leaves immersed and caterpillars sprayed with EAI,
leaves
immersed in ETP, caterpillars sprayed with ETP, caterpillars sprayed
and leaves
immersed in ETP), with 40 repetitions per treatment. Results based on
survival
analysis and multivariate statistics showed that the values of larval
mortality,
weight, length,
and
head capsule
width were
significantly affected when submitted to treatment with immersed leaves
and
caterpillars sprayed with extract from A. indica
and with leaves
immersed in this extract.
Key
words
- Neem,
catigua, insecticidal plants, fall armyworm, botanical extract.
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