Atividade inseticida do líquido da castanha de anacardium humile (anacardiaceae) sobre aedes aegypti
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2016-04-07
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Universidade Federal de Goiás
Resumo
Aedes aegypti is the major vector of dengue, chikungunya and zika fever.
Currently, with the lack of specific therapeutic and prophylactic measures, the
main way to prevent these arboviruses is vector control. This control is
performed mainly with the application of insecticides, but continuous use of
these substances favored the emergence of resistant populations, making it
necessary to develop alternative strategies for vector control. An example is
the survey of vegetable substances which may interfere with the
development of the mosquito. In this sense, the Cerrado plants the may be a
promising way. In this study, was investigated the insecticidal activity of
Cashew Nut Shell Liquid (CNSL) produced by the species Anacardium
humile on Aedes aegypti, the dengue vector, Chikungunya and Zika virus.
Fruits of A. humile were collected and kept in greenhouse of forced
ventilation at 40º Celsius during seven days for the extraction of CNSL. Were
performed mortality tests of third instar larvae (L3), pupa and adult, besides
the observation of the oviposition behavior of females and viability of eggs
and observation of the residual effect of solution. The CNSL was diluted in
decreasing gradual concentrations from 1000 to 3ppm, to obtain the Lethal
Concentrations (LC). In oviposition the LC99 was used for larvae. The tests of
residual effect and oviposition were given in two stages, a pilot test of
100ppm and a test with the LC99. Was obtained LC50 and LC90, respectively,
6.63 and 11.23ppm for larvae; 276 and 728.62ppm for pupae, not being
observed mortality in adults. The residual effect of the solution was seven
days in the pilot test and five days in the LC99. In the pilot test for oviposition
was observed repellent effect of CNSL on females with a significant reduction
of eggs number (p = 0.0001 and p=0.0348) and change in standards of
stratification of the eggs on oviposition substrate. The larval hatching rate of
the eggs exposed to moistened substrate with CNSL was significantly lower
(p = 0.0102) when compared to the control. The results presented evidence
the insecticidal activity of the CNSL of A. humile, indicating it as a promising
product in the research for new botanical insecticides. This way, further
studies should be conducted in order to verify possible toxicity of the liquid to
other animals.
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ROMANO, C. A. Atividade inseticida do líquido da castanha de anacardium humile (anacardiaceae) sobre aedes aegypti. 2016. 49 f. Dissertação (Mestrado em Biologia da Relação Parasito-Hospedeiro) - Universidade Federal de Goiás, Goiânia, 2016.