Insecticidal action of Medicinal Plant Extracts on Spodoptera frugiperda
(J.E. Smith) (Lepidoptera: Noctuidae)
Neiva Knaak, Marines S. Tagliari, Vilmar Machado, Lidia M.
Fiuza
Abstract
In this present study the effect of vegetable extracts obtained from 19
plant species on the development of Spodoptera frugiperda
was evaluated. The aqueous extracts were prepared by maceration
(4ºC) and infusion (90ºC) at 10%. The experiments
were realized under controlled conditions (12h of photophase at
25°C and 70% U.R.) using 100µL of the vegetable
extract in the artificial diet fed to 2º instar caterpillars
individually identified. In the control samples the vegetable extract
was substituted by distilled water. Amongst the medicinal plant species
tested, only Lantana
camara had no effect on any of the variables analysed. The
larval phase was prolonged by the extracts of M. silvestris, C. ensiformes, C. verbenacea, C. zedoaria and C. citratus, while
the duration of the pupal phase was extended by the S. officinalis and C. verbenacea
mixtures. Reductions in the sizes of the pupa were observed with the
use of four of the vegetable species, and the weight was reduced by
five species. At this phase in the tests therefore, 16 species were
shown to cause anomalies and six produced negative effects on
oviposition and fertility. The results indicate that, of the plant
species evaluated in this study, 18 interfered in the development of S. frugiperda in
various ways and should now be analysed to determine the chemical
composition that makes these plant extracts potential insecticides for
control of the target species.
Key
words
- Biological cycle; Plant insecticide; Botanical insecticide;
Armyworms, Bioassay.
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