Toxicidade de compostos sintéticos e naturais sobre Tetranychus urticae e o predador Phytoseiulus macropilis

Abstract

Resumo -O objetivo deste trabalho foi avaliar a toxicidade de compostos sintéticos e naturais sobre Tetranychus urticae e o predador Phytoseiulus macropilis. A mortalidade e a taxa de crescimento de T. urticae e seu predador foram avaliadas após a aplicação de: abamectina, clofentezina, fenpropatrina, fenpiroximato, propargito, enxofre e espiromesifeno, nas concentrações recomendadas; óleos de nim (Natuneem e Sempre Verde Killer Neem a 1%); e extratos aquosos a 10% Termos para indexação: acaricida, ácaro predador, ácaro-rajado, extrato de planta. Toxicity of synthetic and natural compounds on Tetranychus urticae and the predator Phytoseiulus macropilisAbstract -The objective of this work was to evaluate the toxicity of synthetic and natural compounds on Tetranychus urticae and the predator Phytoseiulus macropilis. Mortality and growth rates of T. urticae and its predator were evaluated after applications of: abamectin, clofentezine, fenpropathrin, fenpyroximate, propargite, sulfur and spiromesifen, at their recommended concentrations; neem oils (Natuneem and Sempre Verde Killer Neem at 1%); and aqueous extracts at 10% of Dieffenbachia brasiliensis, Annona squamosa, Ruta graveolens, Agave angustifolia, Melia azedarach, Sonchus oleraceus, Mentha spicata x M. suaveolens, Allium cepa, Laurus nobilis, and Eucalyptus saligna. The acute toxicity and the influence of the compounds on the instantaneous growth rate of the mites were carried out in laboratory. Extracts of A. cepa, A. angustifolia, neem oil-based products, spiromesifen, propargite, fenpyroximate, abamectin and fenpropathrin caused mortality higher than 83% on T. urticae. Extract of A. angustifolia, Natuneem and clofentezine did not cause significant mortality rates on P. macropilis. Agave angustifolia and Natuneem did not affect significantly the growth rate of this predator. Propargite, fenpyroximate, abamectin, fenpropathrin, spiromesifen and extract of L. nobilis severely affected P. macropilis population.

Acaricidal activity of juazeiro leaf extract against red spider mite in cotton plants

“…In addition, aqueous extracts can have lower persistence than other types of extracts (Venzon et al, 2008;Marangoni et al, 2012;Veronez et al, 2012), explaining the results observed in the present study. Light is one of the major causes of pesticide degradation after application in the environment; this degradation depends on exposure duration, light wave intensity and length, temperature, humidity, and pesticide chemical composition (Yu, 2008).…”

“…Natural products contain compounds that degrade more rapidly than most synthetic chemicals, signifying a decrease in the chance of pest arthropods developing resistance, minor residual effects, and low toxicity to humans (Hincapié et al, 2008;Veronez et al, 2012). In addition, aqueous extracts can have lower persistence than other types of extracts (Venzon et al, 2008;Marangoni et al, 2012;Veronez et al, 2012), explaining the results observed in the present study.…”

“…Aqueous extracts of garlic (Allium cepa L.) and agave (Agave angustifolia Haw.) reduce T. urticae (Koch, 1836) (Acari: Tetranychidae) survival, causing a mortality rate higher than 83% (Veronez et al, 2012 (Vieira et al, 2006). Residual effect tests showed that the extracts of Annona squamosa L., Calendula officinalis L., Coffea arabica L., Ricinus communis L. Ginkgo biloba L., and Nepeta cataria L. were promising, leading to over 60% mortality in Oligonychus ilicis (McGregor, 1917) (Acari: Tetranychidae) mites (Carvalho et al, 2008).…”

Laurus nobilis L.: assessment of the cytotoxic and genotoxic potential of aqueous extracts by micronucleus and Allium cepa assays

“…Although Kivçak and Mert (2002) only observed the presence of cytotoxic effects in the hexane extract of Laurus nobilis leaves, more recent studies have demonstrated that the aqueous extract of the leaves is effective in reducing the population of the mite Phytoseiulus macropolis, besides having antiproliferative effect on some tumor cell lines (Veronez, Sato, Nicastro, 2012;Dias et al, 2014). Finally, some researchers have demonstrated the antifungal and antibacterial activity of the essential oil obtained from L. nobilis leaves (Rafiq et al, 2016;Peixoto et al, 2017).…”

Selection of full and half brothers families of yellow passionfruit resistant to Tetranychus mexicanus

“…The control of mite of the genus Tetranychus spp. has been carried out using synthetic chemical pesticides (VERONEZ et al, 2012), plant extracts (ERDOGAN et al, 2012), and biological control (GRECO et al, 2011). The possibility of control by genetic resistance has been studied in vine (VALADÃO et al, 2012) and cotton (MIYAZAKI et al, 2012).…”