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

ABSTRACT

The constant use of chemical insecticides for Aedes aegypti control has caused resistance in the mosquito populations. Thus, the objective of this study was to analyze the larvicidal potential of extracts and fractions of plants on A. aegypti larvae. The analysis included sixty one extracts and twenty five fractions of fifty botanical species at concentrations of 0.25; 0.12; 0.06 to 0.03 mg mL^-1; 4 replications and one negative control of dechlorinate water and 1% DMSO; and a positive control with rotenone. The toxicity index in descending order with LC₅₀ for the most active of the extracts selected were ethanol extract of Ormosea arborea (0.111 mg mL^-1) seeds and ethanol extracts of leaves such as Piper hispidum (0.169 mg mL^-1), Solanum variabile (0.188 mg mL^-1), O. arborea (0.238 mg mL^-1), Turnera umifolia (0.242 mg mL^-1) and Piper hispidum (0.567 mg mL^-1). For plant fractions, the most active were chloroform (0.192 mg mL^-1) and hexane (0.342 mg mL^-1) P. aduncum leaves, hexane fraction (0.415 mg mL^-1) and methanol extract (0.625 mg mL^-1) of Spermacocea latifolia leaves. Regarding the extract of T. umifolia single species, there is no bibliographic report on their degree of efficiency as an insecticide.

Key words:
Dengue fever; insecticidal activity; insecticide from plant; larvicidal potential; disease vector

INTRODUCTION

Brazil is considered an endemic area for dengue, which is transmitted by the mosquito Aedes aegypti (L.) (Culicidae) (Maciel et al. 2008). Dengue fever in Brazil, since 1986, has reached about 3 million cases. Only in the State of Mato Grosso do Sul, the year 2007 witnessed the largest outbreak of dengue fever (69,378 reports), with the city of Campo Grande recording the largest number of cases per capita ever reported in a state capital (44,695 cases), meaning one case per 16 residents (Oliveira et al. 2009).

Each year it is estimated that infections with dengue virus are responsible for more than 100 million of classic cases and more than 500 thousand cases of hemorrhagic dengue fever worldwide (Halstead 2007). In Brazil, from January to July 2010, 942,153 cases were reported in the country. In the same period of the previous year, 593,669 cases were reported, representing an increase of 58.7%. The states with the highest incidence were Acre (3,619.5 cases per 100,000 inhabitants), Mato Grosso do Sul (2,521.1 cases per 100,000 inhabitants), Goiás (1,353.1 cases per 100,000 inhabitants), Rondônia (1,256.4 cases per 100,000 inhabitants), Roraima (1,146.9 cases per 100,000 inhabitants) and Mato Grosso (1,095.5 cases per 100,000 inhabitants). These six states make up 75% of cases in Brazil (Oliveira et al. 2011).

The safest way to combat or prevent a virus is immunization. However, other measures have been employed in the control and against vector spread, such as environmental sanitation, epidemiological surveillance, laboratory and research support, and education (Teixeira et al. 2009).

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).

Chemical control with organophosphates proved to be inefficient in combating the mosquito. Among the organophosphates, temephos was reported as Aedes-resistant by Melo-Santos et al. (2010). Malathion and fenitrothion, which are used for controlling the adult stages of Aedes, are encountering resistance in different degrees (Pontes et al. 2005).

Concerns about the possible impacts on the environment and population health have allowed the development of products based on plants as an alternative to the use of synthetic chemicals (Oliveira Filho 2008). Studies have been developed to obtain products from plants with insecticidal properties (Furtado et al. 2005, Garcez et al. 2013).

In this study, we analyzed the insecticidal potential of plant extracts and fractions found in Mato Grosso do Sul on larvae of A. aegypti.

MATERIALS AND METHODS

SOURCE OF PLANT MATERIAL

Fifty plant species were collected from 1999 to 2012. Forty-eight came from different regions of the Cerrado and Pantanal in Mato Grosso do Sul and two exotic species from Campo Grande -MS (Melia azedarach L. e Nerium Oleander L.). The voucher specimens were sent to identification to the herbarium of Anhanguera - Uniderp University (by Eloty Justina Dias Schleder) and Federal University of Mato Grosso do Sul (by Vali Joana Pott and Arnildo Pott).

The plants subjected to the experiment in different extracts were: Anacardium humile St. Hil; Arachis hypogaea L.; Baccharis dracunculifolia DC.; Bambusa multiplex Lour. Raeusch.; Bambusa vulgaris var vittata Schrad. ex J.C. Wendl; Bauhinia fortificata Link.; Casearia silvestri Sw; Chenopodium ambrosioides L.; Cochlospermum regium Mart. ex Schrank Pilq.; Combretum leprosum Mart .; Crescentia cujete L.; Cymbopogon cittratus (D.C.) Stapf.; Diodia kuntzei K. Shum; Dimorphandra sp. Schott.; Equisetum pyramidale L.; Genipa americana L.; Guazuma ulmifolia Lamarck; Jacaranda cuspidifolia Marth.; Lafoensia pacari A. ST.-Hil.; Leucaena leucocephala (Lamark) de Wit; Maclura tinctoria (L.) D. Don ex Steud.; Melia azedarach L.; Malpighia glabras Linn; Myracrodruon urundeuva Allemão; Nerium oleander L.; Osmosea arborea Vell; Paullinia grandiflora St. Hill; Phoradendron sp. Nutt.; Piper aduncum L.; Piper amalago L.; Piper glabratum Kunt.; Piper hispidum Sw.; Piper vicosanum Yunk; Pouteria ramiflora (Mart.) Radlk; Randia armata Sw (DC); Richardia brasiliensis Gomes; Sebastiana hispida (Mart.) Pax; Solanum variabile Mart.; Spermacocea verticilata L.; Spermacocea grisebachii L.; Spermacocea latifolia L.; Stachytarpheta cayennensis Rich. Vahl; Sterculia apetala (Jacq.) H. Krast; Struthanthus flexicaulis M.; Tamarindus indicaL.; Tibouchina granulosa (Desr.) Cogn.; Tithonia diversifolia (Hemsl.) A. Gray; Turnera ulmifolia L.; Vernonia brasiliana L. (Druce); Vigna angularis Willd.

PREPARATION OF EXTRACTS

The plant material (leaves, stems, roots and fruits) were dried in an oven at 45 °C. The extraction with different solvents occurred by continuous maceration until exhaustion of the plant extract, the solvent was then removed via rotary evaporator and concentrated to obtain a homogeneous emulsion. Part of the extracts were dissolved in methanol/water and partitioned with solvents of different polarities (hexane, dichloromethane, chloroform and/or ethyl acetate).

The extracts and fractions of the species are presented in Table I. The descriptions are established in accordance with the updated nomenclature by the List of Species of the Brazilian Flora (2013).

TABLE I
Activity of plant extracts on Aedes aegypti larvae at concentration of 0.5 mg mL^-1 .

Species	Popular name	Plant organ	Extract (Ext.)/ Fraction (Fr.)	Death Percentage
Amaranthaceae (1)
Chenopodium ambrosioides L.	Erva de Santa Maria	Leaves	Ethanolic ext.	-
Anacardiaceae (2)
Anacardium humile St. Hil	Cajuzinho do Cerrado	Leaves	Ethanolic ext.	up to 30
			Hexane fr.	-
Myracrodruon urundeuva Allemão	Aroeira	Leaves	Ethanolic ext.	-
		Twig		-
Apocynaceae (3)
Nerium Oleander L.	Espirradeira	Leaves	Chloroform fr.	-
Asteraceae (4)
Baccharis dracunculifolia DC.	Vassourinha	Leaves	Ethanolic ext.	up to 30
Tithonia diversifolia (Hemsl.) A. Gray	Margaridão, Girassol mexicano	Leaves	Ethanolic ext.	-
		Twig	Hexane fr.	-
Vernonia brasiliana L.	Assa-peixe	Leaves	Ethanolic ext.	-
(Druce)		Stems		-
Bignoniaceae (5)
Crescentia cujete L.	Árvore de cuia, cabaça	Leaves	Ethanolic ext.	-
Jacaranda cuspidifolia Marth.	Caroba	Leaves	Dichloromethane fr.	-
		Stems		-
		Leaves	Hexane fr.	-
Bixaceae (6)
Cochlospermum regium Mart. ex Schrank Pilq.	Algodão-do-campo	Leaves	Ethanolic ext.	-
		Twig		-
		Tubercle		-
		Leaves	Ethyl acetate fr.	-
		Leaves	Hexane fr.	-
		Twig		-
		Tubercle		-
Combretaceae (7)
Combretum leprosum Mart.	Carne-de-vaca	Leaves aerial parts		-
Equisetaceae (8)
Equisetum pyramidale L.	Cavalinha	aerial parts	Ethanolic ext.	-
			Methanolic ext.	-
Euphorbiaceae (9)
Sebastiana híspida (Mart.) Pax	Erva virgem	Leaves	Ethanolic ext.	-
			Hexane fr.	-
			Ethyl acetate fr.	-
			Methanolic fr. hydro	-
Fabaceae (10)
Arachis hypogaea L.	Amendoim	Leaves	Ethanolic ext.	-
		Twig		-
Bauhinia fortificata Link.	Pata-de-vaca	Leaves	Ethanolic ext.	-
Dimorphandra sp. Schott.	Faveiro	Fruits	Ethanolic ext.	-
			Hexane fr.	-
			Ethyl acetate fr.	-
Leucaena leucocephala (Lamark) de Wit	Leucena	Leaves	Ethanolic ext.	-
		Twig		-
Osmosea arborea Vell	Dracena	Leaves	Ethanolic ext.	100
		Seeds		100
Tamarindus indica L.	Tamarindo	Leaves	Ethanolic ext.	-
Vigna angularis Willd.	Feijão azuki	Leaves	Ethanolic ext.	-
Flacourtiaceae (11)
Casearia silvestri Sw	Chá-de- frade	Leaves	Ethanolic ext.	-
Lythraceae (12)
Lafoensia pacari A. ST.-Hil.	Mangabeira-brava	Leaves	Ethanolic ext.	-
Loranthaceae (13)
Struthanthus flexicaulis M.	Erva de passarinho	Leaves	Ethanolic ext.	-
Meliaceae (14)
Melia azedarach L.	Cinamomo	Leaves	Ethanolic ext.	-
Malpighiaceae (15)
Malpighia glabras Linn	Acerola	Leaves	Ethanolic ext.	-
Melastomataceae (16)
Tibouchina granulosa (Desr.) Cogn.	Quaresmeira	Leaves	Ethanolic ext.	-
Moraceae (17)
Maclura tinctoria (L.) D. Don ex Steud.	Amora brava, taiúva	Leaves Twig	Ethanolic ext.	-
Piperaceae (18)
Piper aduncum L.	Pimenta de macaco	Leaves	Ethyl acetate fr.	100
			Chloroform fr.	100
			Hexane fr.	100
Piper amalago L.	Jaborandi	Leaves	Methanolic ext.	-
			Hexane fr.	-
Piper glabratum Kunt.	Piraparoba	Leaves	Ethanolic ext.	-
Piper hispidum Sw.	Jaborandi falso	Leaves	Methanolic ext.	100
			Hexane fr.	100
Piper vicosanum Yunk	Jaborandi	Leaves	Ethanolic ext.	-
Poaceae (19)
Bambusa multiplex Lour. Raeusch.	Bambu	Leaves	Ethanolic ext.	-
Bambusa vulgaris var vittata Schrad. ex J. C. Wendl	Bambu	Leaves	Ethanolic ext.	-
Cymbopogon cittratus (D.C.) Stapf.	Capim Citronela	Leaves	Ethanolic ext.	-
Rubiaceae (20)
Diodia kuntzei K. Shum	Planta aquática do Pantanal	Leaves	Methanolic ext.	-
			Ethanolic ext.	-
			Aqueous fr.	-
Genipa americana L.	Genipapo	Leaves	Ethanolic ext.	up to 30
		Fruits		up to 30
Randia armata Sw (DC)	Fruta de cachorro,	Leaves	Methanolic ext.	-
Richardia brasilienses Gomes	Erva-botão	Leaves	Ethanolic ext.	-
Spermacocea grisebachii L.	Agrião-do-campo	Leaves	Methanolic ext.	up to 30
Spermacocea latifolia L.	Agriãozinho	Leaves	Methanolic ext.	100
			Hexane fr.	100
Spermacocea verticilata L.	Vassourinha de botão	Leaves	Ethanolic ext.	_
Santalaceae (21)
Phoradendron sp. Nutt.	Erva-de-passarinho	Twig	Ethanolic ext.	-
		Twig	Aqueous fr.	-
		Leaves	Ethanolic ext.	-
Sapindaceae(22)
Paullinia grandiflora St. Hill	Timbó	Leaves	Methanolic ext.	-
		Twig		-
		Seeds		-
Sapotaceae (23)
Pouteria ramiflora (Mart.) Radlk	Leitero preto, abiu	Leaves	Ethanolic ext.	-
Solanaceae (24)
Solanum variabile Mart.	Jurubeba	Leaves	Ethanolic ext.	100
Sterculiaceae (25)
Guazuma ulmifolia Lamarck	Chico magro	Leaves	Ethanolic ext. Ethanolic ext.	-
		Twig		-
		Leaves	Aqueous fr.	-
Sterculia apetala (Jacq.) H.Krast	Mandovi, Amendoim-de-bugre	Leaves	Methanolic ext.	-
Turneracea (26)
Turnera ulmifolia L.	Erva damiana	Leaves	Ethanolic ext.	100
Verbenaceae (27)
Stachytarpheta cayennensis Rich. Vahl	Gervão	Leaves	Ethanolic ext. Ethanolic ext.	-
		Twig		-
Leaves	Aqueous fr.	-

• *30%: percentage of minimum mortality for testing with toxicity indicative in plant extracts at different concentrations as established by McLaughlin (1991).

EXPERIMENTAL COLONY

Collections of A. aegypti eggs were made in five neighborhoods in the city of Campo Grande, Mato Grosso do Sul, in partnership with the Center for Zoonosis Control (CCZ) using adapted methodology (Miyazaki et al. 2009, Gomes et al. 2007). The eggs were subjected to incandescent lighting for seven days until maturity. After that, F1 generation was produced and bioassays were conducted (Barata et al. 2001, Shaalan et al. 2005, Pontes et al. 2005).

The eggs were subjected to hatching in dechlorinate water and kept in Biochemical Oxygen Demand (BOD) incubator at 27 ± 2 ° C and 14-hour photoperiod. The larvae were fed with cat food and water was daily replaced, as well as pH checked. In the adult stage, females were fed with blood supply every three days for 1.5 hours and males with 8% sugary food.

BIOASSAYS

Third stage larvae were selected for the testing, with larval density of 1:1 larvae/mL extract dissolved in dimethyl sulfoxide (DMSO) at 1%. A negative control group of larvae was submitted to only dechlorinate water and DMSO at 1% and a positive control group to rotenone concentration from 0.002 to 0.020 mg mL^-1 for 10, 50 and 90% of the exposed population group. The analysis was performed in quadruplicate.

Samples of each extract were dissolved in 1% DMSO to obtain a solution of 0.5 mg mL^-1. It was initially used for the preliminary tests with two replications per species for a toxicity general testing and then in dilutions of 0.25; 0.12; 0.06 and 0.03 mg mL^-1 in quadruplicate. The test results were checked after 24 hours of exposure.

STATISTICAL ANALYSIS

For the analysis of toxicity testing (LC₁₀, LC₅₀ and LC₉₀), parametric regression method Probit (Mclaughlin 1991) was performed using Leoraâ software (POLO 9735947870655352).

RESULTS AND DISCUSSION

The results of toxicity testing for larvae of A. aegypti at 0.5 mg mL^-1 in 61 extracts, 25 fractions and 50 plant species are presented in Table I.

The extracts of S. grisebacei, B. dracunculifolia and G. americana showed larvicidal activity capable of causing death in 30% of the population at concentration of 0.5 mg mL^-1. However, these extracts did not result in mortality at lower concentrations and hindered the calculation of LC₅₀.

The extracts of O. arborea, T. ulmifolia and S. variabile, as well as extracts and fractions of P. aduncum L., P. hispidum L. and S. latifolia caused total mortality at a concentration of 0.5 mg mL^-1 (Table I) and lethal concentrations (LC) at lower dilutions (Table II).

TABLE II
Lethal Concentration (LC) in mg mL^-1 for the different extracts of Aedes aegypti larvae.

Plant species	Lethal Concentration	Average value in correlation 95% (mg mL-1)	Range limit in correlation 95%
			(mg mL -1)
Ormosea arborea VellA	LC10	0.164	0.133	-	0.185
	LC50	0.238	0.216	-	0.266
	LC90	0.347	0.307	-	0.429
Ormosea arborea VellB	LC10	0.063	0.050	-	0.073
	LC50	0.111	0.098	-	0.124
	LC90	0.194	0.168	-	0.239
Spermacoceae latifolia L.C	LC10	0.191	0.125	-	0.245
	LC50	0.415	0.341	-	0.512
	LC90	0.901	0.690	-	1.441
Spermacoceae latifolia L.D	LC10	0.125	0.118	-	0.148
	LC50	0.625	0,618	-	0.653
	LC90	1.122	1.178	-	1.153
Solanum variabile Mart.A	LC10	0.097	0.062	-	0.124
	LC50	0.188	0.153	-	0.232
	LC90	0.284	0.249	-	0.581
Piper aduncum L.C	LC10	0.122	0.118	-	0.190
	LC50	0.342	0.206	-	0.401
	LC90	0.473	0.414	-	0.670
Piper aduncum L.E	LC10	0.034	0.035	-	0.042
	LC50	0.192	0.188	-	0.195
	LC90	0.346	0.340	-	0.350
Piper hispidum Sw.A	LC10	0.060	0.477	-	0.721
	LC50	0.169	0.169	-	0.189
	LC90	0.474	0.403	-	0.582
Piper hispidum Sw.E	LC10	0.320	0.264	-	0.366
	LC50	0.567	0.501	-	0.665
	LC90	1.003	0.818	-	1.410
Turnera ulmifolia MilspA	LC10	0.146	0.069	-	0.192
	LC50	0.242	0.182	-	0.334
	LC90	0.899	0.800	-	0.922

• A= Ethanolic extract of leaves. B= Ethanolic extract of seeds. C= Hexane extract of leaves. D= Methanolic extract of leaves. E= Chloroform extract of leaves.

The ethanolic extract of O. arborea seeds (LC₅₀ 0.111 mg mL^-1) was the most toxic showing high mortality at lower concentrations, followed by ethanolic extracts of P. hispidum (0.169 mg mL^-1), S. variabile (0.188 mg mL^-1), O. arborea (0.238 mg mL^-1), T. umifolia (0.242 mg.mL^-1) and P. hispidum (0.567 mg mL^-1) leaves. The most active fractions were chloroform (0.192 mg mL^-1) and hexane (0.342 mg mL^-1) of P. aduncum leaves; and hexane fraction (0.415 mg mL^-1) and methanol extract (0.625 mg mL^-1) of S. latifolia leaves (Table II).

Govindarajan (2009) reported that the Cassia fistula leaf extract (Fabaceae) holds larvicidal and ovicidal action for A. aegypti, as well as a repellent in the peridomestic environment. Similar studies with Casealpina ferrea (Fabaceae) seeds presented larvicidal activity with 85% efficiency for vectors of dengue and yellow fever (Cavalheiro et al. 2009).

Derivatives of the emulsion composed of different species of Copaifera showed insecticidal activity against vectors of A. aegypti and A. darlingi. The lethal concentrations for A. aegypti of Copaifera sp. LC₅₀ showed values of 47 mg L^-1 and LC₉₀ 91 mg L^-1. For C. guianensis, the values were LC₅₀ 136 mg L^-1 and LC₉₀ 551 mg L^-1 (Prophiro et al. 2012, Trindade et al. 2013).

The second major toxicity was obtained in ethanol extract of P. hispidum leaves. Piper has been described as effective insecticide. Studies with P. aduncum showed larvicidal activity of essential oil on A. aegypti (Oliveira et al. 2013).

The extracts of leaves and roots of P. aduncum and extracts of leaves, fruits and branches of P. tuberculatum at 0.5 g L^-1 caused total mortality in A. aegypti larvae (Pohlit et al. 2004). The essential oils of P. gaudichaudianum, P. permucronatum, P. humaytanum and P. hostmanianum against A. aegypti larvae were analyzed. The most active oil was P. permucronatum LC₅₀ 0.36 mg mL^-1, followed by P. hostmanianum LC₅₀ 0.54 mg mL^-1 (Morais et al. 2007).

According to Misni et al. (2008), the essential oil of P. aduncum acts as an excellent repellent for A. aegypti. Subsequent studies showed that the essential oil at 8 and 10% led to significant mortality higher for A. aegypti (80%) than for A. albopictus (71.6%) (Misni et al. 2011).

The essential oil of P. marginatum inflorescences did not affect the oviposition when at concentration of 0.05 mg mL^-1, but was effective in mortality of A. aegypti larvae at LC₁₀ and LC₅₀ of 0.0138 and 0.02 mg L^-1, respectively (Autran et al. 2009). Sousa et al. (2008) reported low toxicity when analyzing the action of Piper species on A. aegypti larvae.

The grandisin lignan isolated from P. solmsianum caused larval mortality at LC₅₀ 150 mg mL^-1. Histological analyzes reveal that the larvae had changes in the digestive tract, in the anterior and middle intestine with a tissue disorganization followed by death (Leite et al. 2012).

Other authors analyzed the essential oils of P. aduncum and P. hispidinervum on Tenebrio molitor (Fazolin et al. 2007), Piper aduncum and Piper hispodinervum on Sitophilus zeamais (Estrela et al. 2006), and P. aduncum on Cerotoma tingomarianus (Fazolin et al. 2005) reporting high toxicity. High insecticidal potential was attributed to P. tuberculatum extracts on larval stage of Spodoptera frugiperda (Castro 2007). Subsequently, Santos et al. (2010) describe the insecticidal activity of P. hispidum leaf extract and larvicidal potential on Hypothenemus hampei control.

According to the third LC₅₀, the most toxic extract was obtained from S. variabile (Table I).

The aqueous extracts of Solanum villosum (Solanaceae) applied against Stegomyia aegypti (Culicidae) larvae caused mortality rates within 72 hours of exposure (Chowdhury et al. 2008).

A. aegypti larvae were subjected to Nicotiana tabacum (Solanaceae) extract. LC₅₀ showed 0.45% and 0.12%, and LC₉₀ 0.98% and 0.25%, respectively (Quirino 2010).

The larvicidal action on A. aegypti may be related to its antioxidant activity, causing inhibition of esterase, glutathione transferases or monooxygenases. 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.

Preliminary phytochemical analysis of Capsicum frutescens var. longum showed high content of tannins, alkaloids, steroids and glycosides present in leaves and fruits (Vinayaka et al. 2010). They may be used as blockers of enzyme action since one of the mechanisms for larval mortality is related to the metabolism of esterases and other monooxygenase. Gupta et al. (2011) evaluated the larvicidal potential of seed α-amylase inhibitor of Macrotyloma uniflorum in larvae, pupae and adults of A. aegypti and found adulticidal and larvicidal effect at a concentration of 0.2 mg mL^-1.

To analyze the larvicidal potential of Cestrum nocturnum extract, Jawale et al. (2010) classified as active with 100% larvae mortality in 24 hours, setting LC₁₀₀ 12 mg L^-1 and LC₅₀ 6 mg L^-1. In accordance with the results obtained for the extracts of Plumbago zeylanica and C. nocturnum, the presence of bioactive phytochemicals influenced life cycle of A. aegypti by inhibiting the development of pupae and adult emergence (Patil et al. 2011).

The extract of T. umifolia leaves in this study was the only one with no reports of insecticidal activity. The genus Turnera (Turneraceae), known as chanana, has distribution in Brazil and South America. Santos et al. (2010) analyzed of the extract of T. ulmifolia leaves and observed the molluscicidal activity against Biomphalaria glabrata, and cytotoxicity with Artemia salina. The species has also been effective in controlling infectious forms of Trypanosoma cruzi and Leishmania (Santos et al. 2012).

Reports from Nazar et al. (2009) and Dhanasekaran et al. (2013) describe the larvicidal and ovicidal potential and the repellent in ethanol extract of S. hispida against Anopheles stephensi, A. aegypti and Culex tritaeniorhynchus. The mortality of A. stephensi occurred at LC₅₀ 89.45 mg L^-1 and 100% repellency against female adult mosquitoes. Over 75% mortality was obtained from ethanolic extract of Spermacocea verticillata at concentration of 250 mg L^-1 on the larvae of A. aegypti (Souza et al. 2013).

The data obtained in this study from larvicidal activity and literature information enabled the characterization of the species potential. The family(ies) evaluated proved its potential compared to the literature. However, it is recommended to continue the monitoring studies of sub-lethal dosages and fractionation of greater efficiency extracts for identification of main active principles which can be used as efficiency markers for other species.

CONCLUSIONS

This study shows the insecticide potential in plants found in Mato Grosso do Sul, Brazil. Forty-eight botanical species were analyzed and showed potential insecticide of O. arborea, S. latifolia, S. variabile, P. hispidum, P. aduncum and T. umifolia in order of efficiency for causing toxicity at lower concentrations.

ACKNOWLEDGMENTS

The Ministério de Ciência e Tecnologia (MCT), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Instituto Nacional de Ciência e Tecnologia em Áreas Úmidas (INAU), Centro de Pesquisa do Pantanal (CPP), Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul (FUNDECT), Universidade Anhanguera - Uniderp and Universidade Católica Dom Bosco. The authors are grateful to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for providing the research grant (PQ2).

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Publication Dates

• Publication in this collection
  Apr-Jun 2017

History

• Received
  09 Jan 2015
• Accepted
  10 Oct 2016