Effect of Used Coffee Grounds on Larval Mortality of Aedes aegypti L. (Diptera: Culicidae): Suspension Concentration and Age versus Efficacy

Abstract

Efeito da Borra de Café na Mortalidade Larval de Aedes aegypti L. (Diptera: Culicidae): Concentração eIdade da Suspensão versus Eficácia RESUMO -Em estudo anterior, a borra do café afetou o desenvolvimento larval de Aedes aegypti L. No presente trabalho, foi analisada a duração do efeito na mortalidade larval, de suspensões aquosas de borra do café, nas concentrações 75, 150, 250 e 300 mg/ml. A mortalidade larval nos criadouros experimentais foi acompanhada diariamente: a concentração 300 mg/ml foi a mais eficiente, produzindo 100% de mortalidade até nove dias após o preparo da suspensão. Estes resultados foram observados tanto em experimentos nos quais as larvas permaneceram livres podendo fazer contato com o depósito de borra do café no fundo dos frascos e com o sobrenadante líquido, como também nos experimentos em que as larvas foram mantidas em uma peneira de tela fina imersa na parte líquida da suspensão. Embora a eliminação dos criadouros seja a melhor maneira de controlar o tamanho das populações de A. aegypti, os resultados deste estudo reforçam a validade de considerar a borra do café como um possível auxiliar no controle deste mosquito, principalmente em jardins. A borra do café tem a vantagem de ser livre de custo, pois é o pó deixado no coador e jogado fora depois que a bebida é preparada. PALAVRAS-CHAVE: Aedes aegypti, controle alternativo, borra do caféABSTRACT -In a previous study, used coffee ground affected the larval development of Aedes aegypti. In this work, we evaluated the duration of the effect on larval mortality of aqueous suspensions of used coffee ground at 75, 150, 250 and 300 mg/ml concentrations. The larval mortality was followed daily, in the experimental breeding sites; 300 mg/ml was the most efficient concentration, producing 100% of larval mortality until nine days after preparation. These results were observed in experiments in which the larvae remained free in the vials, making contact both the used coffee ground deposits and the supernatant liquid, and also in experiments in which the larvae were maintained in a sieve of fine screen immersed in the liquid part of the suspension. Thus, although the elimination of the breeding sites remains being the best way to control Aedes aegypti population size, the results obtained herein reinforces the validity of considering used coffee ground preparations as possible auxiliary in the alternative control of this mosquito, mainly in the gardens. Used coffee ground has the advantage of being free of cost, since it is the powder that is left after coffee has been filtered out to drink.

Screening of plant extracts and fractions on Aedes aegypti larvae found in the state of Mato Grosso do Sul (linnaeus, 1762) (culicidae)

“…This action was cited by Guirado et al (2009) as one of the defense mechanisms of vectors and a common condition observed in resistant populations found in the national territory.…”

“…A current form of control is fogging insecticides such as organophosphate and pyrethroid, but their continuous use has resulted in resistance of populations (Guirado and Bicudo 2009) and exposure of operators (Vilela et al 2010) to the compounds. These effects have been reported in Latin American countries, decreasing the effectiveness of this strategy in mosquito control (Rodríguez and Fernández 2007).…”

Efficacy of used coffee grounds as larvicide against Aedes albopictus (Skuse, 1894) and Ae. aegypti Linné, 1762 (Diptera: Culicidae)

“…Regarding the efficacy of the used coffee grounds as larvicide, the literature shows very different results. Guirado and Bicudo (2007) recorded a complete mortality of Ae. aegypti larvae but using a very high quantity of dry UCG (300 mg/ml) while Laranja et al (2003) completely killed the larvae of the same species using only 50 mg/ml.…”

“…The internet has, surely, contributed to the wide circulation of information regarding possible alternative and biological methods for fighting mosquitoes. This led to the testing of different substances and materials including metallic copper (Della Torre et al, 1993), coffee grounds (Dieng et al, 2018;Ellias et al, 2015;Guirado and Bicudo, 2007;Laranja et al, 2003;Wiwanitkit, 2018) and tea extracts (Dieng et al, 2016). One advantage of the use of alternative insecticides would be to overcome the onset of resistance phenomena (Dieng et al, 2016).…”

Spent Coffee Grounds Do Not Control Cycad Aulacaspis Scale

“…Potential insecticidal activity of coffee was tested on leaf-cutting ant (Atta sexdens rubropilosa) with negative results (Miyashira et al, 2011) and on mosquito (Aedes aegypti) with positive results (Guirado and Bicudo, 2007;Laranja et al, 2003).…”