Effects of botanical insecticides on the instantaneous population growth rate of Aphis gossypii Glover (Hemiptera: Aphididae) in cotton

Lígia Helena de Andrade,José Vargas de Oliveira,Iracilda Maria de Moura Lima,Mariana Oliveira Breda,Edmilson Jacinto Marques

doi:10.4025/actasciagron.v34i2.10863

Abstract

Botanical insecticides have been studied aiming the alternative pest control. The present study investigated the effects of these insecticides on the instantaneous population growth rate (ri) of Aphis gossypii. Botanical insecticides were tested in the following concentrations: Compostonat®, Rotenat-CE® and Neempro (0, 0.50, 0.75, 1.00, 1.25, 1.50 and 1.75%); Natuneem® and Neemseto® (0, 0.25, 0.50, 0.75 and 1.00%) and essential oils of Foeniculum vulgare Mill., Cymbopogom winterianus (L.), Chenopodium ambrosioides L. and Piper aduncum L (0, 0.0125, 0.025, 0.0375 and 0.05%). Cotton leaf discs, CNPA 8H cultivar with 5 cm in diameter were immersed for 30 seconds in products broth and dried for 30 minutes. Eight replicates per concentration were used and each disc was infested with five apterous adult females of A. gossypii uniform in size and confined for 10 days. Compostonat®, Rotenat® and Neempro provided negative ri decreasing A. gossypii population. Natuneem® and Neemseto® and the essential oil of F. vulgare showed positive ri increasing the population. The coefficients of determination (R2) of regression lines ranged from 0.46 to 0.85. The essential oils of C. winterianus, C. ambrosioides and P. aduncum were not statistically significant precluding the establishment of regression lines.

Highlights

Aphis gossypii Glover (Hemiptera: Aphididae) is a pest of great economic importance to cotton crop
Due to the concern of researchers, farmers and society as a whole, about the side effects of pesticides overuse, researched on new alternative methods of pest control has a major boost in recent decades, citing as example studies with botanical insecticides
To test a promising alternative tactics that can be used in the integrated management of cotton pests, especially organic and family crops, this study propose to evaluate the ri of A. gossypii under different concentrations of botanical insecticides

Summary

Introduction

Aphis gossypii Glover (Hemiptera: Aphididae) is a pest of great economic importance to cotton crop. 119-124, Apr.-June, 2012 et al, 2003; CLOYD et al, 2009; ESTRELA et al, 2006; ISMAN, 2006; MARTINEZ; VAN EMDEN, 2001) These products, derived from secondary metabolism of plants, are composed of complex mixtures of chemical substances such as monoterpenes, sesquiterpenes and flavonoids playing important roles in the processes of tritrophic interactions (plant-insect-natural enemy) and in the control of insects, mites, fungi and nematodes (FAZOLIN et al, 2005; SCHMUTTERER, 1990; TAVARES; VENDRAMIM, 2005). They act on insects by ingestion, contact and fumigation, and can be used as powders, extracts, essential oils and oil emulsion (ABRAMSON et al, 2006; RAJENDRAN; SRIRANJINI, 2008). Its effects on insects include mortality, feeding deterrence and oviposition, reductions in fecundity, fertility and growth process (BOEKE et al, 2004; MARTINEZ, 2002; ROEL et al, 2000)

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Conclusion