Effect of pyroligneous extract of Acacia mearnsii on Tetranychus urticae (Koch, 1836) (Acari, Tetranychidae) and Neoseiulus californicus (McGregor, 1954) (Acari, Phytoseiidae)

Adriana De Castro,Noeli Juarez Ferla,Júlia Jantsch Ferla,Fernanda Majolo

doi:10.5007/2175-7925.2015v28n4p99

Adriana De Castro, Noeli Juarez Ferla + Show 2 more

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https://doi.org/10.5007/2175-7925.2015v28n4p99

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Abstract

This work aimed to determine the effect of decanted pyroligneous extract (DPE) of black Acacia mearnsii on the mites Tetranychus urticae (Koch, 1836) (Acari: Tetranychidae) and Neoseiulus californicus (McGregor, 1954) (Acari: Phytoseiidae). Six different concentrations were tested, namely, DPE: water 1:600, 1:300, 1:150, 1:75, 1:38 and 1:19 and a control treatment with distilled water. Five females of T. urticae and N. californicus were transferred to arenas, totaling 50 females per treatment, for a period of eight days. DPE caused high mortality in N. californicus, while in T. urticae, high mortality was observed only at high (1:75, 1:38 and 1:19) and intermediate (1:150) concentrations. Notably, DPE was slightly harmful to T. urticae at lower concentrations and harmful to N. californicus at all concentrations, indicating that it would have little efficacy in the control of T. urticae.

Highlights

The smoke resulting from the burning of wood in charcoal production kilns is the main residue of this economic activity, which is released into the atmosphere, acting as a pollutant
The aim of this study was to evaluate in the laboratory the action of decanted pyroligneous extract (DPE) on T. urticae and its selectivity, with regard to its predator, N. californicus
Neoseiulus californicus colonies were kept in rearing units on a sponge moistened with distilled water in plastic trays with bean leaves infested with T. urticae, covered with cardboard

Summary

Introduction

The smoke resulting from the burning of wood in charcoal production kilns is the main residue of this economic activity, which is released into the atmosphere, acting as a pollutant. There is a way to use the smoke and residue produced to prepare a decanted pyroligneous extract (DPE). The smoke is collected and transformed by condensation into a liquid, which has a variety of potential uses in agriculture, such as in eucalyptus (SILVA et al, 2006) and lettuce (MASCARENHAS et al, 2006) crops. When the extract is produced, the pollution caused by kilns is reduced. According to Miyasaka et al (2001), crude DPE cannot be used on agricultural crops without undergoing a puriication process, mainly to eliminate the tar, which is solubilized immediately after obtaining the product

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