Toxicity of three systemic insecticides against coconut scale insect Aspidiotus sp., (Hemiptera:Diaspididae)

Issue Date

10-2014

Abstract

The study assessed the effectiveness of three neonicotinoid insecticides against the coconut scale insect (CSI), and identified physical and developmental indicators that can be used for toxicity evaluation of systemic insecticides against CSI. Laboratory and screenhouse toxicity tests were conducted using imidacloprid, thiamethoxam and dinotefuran against second instar nymphs. In both experiments, these insecticides caused significant mortality as compared to the untreated control. No significant variation, however, was observed among insecticides, indicating that they were equally effective at the dosages tested. Mortality of CSI was assessed using color of the cast skin and/or the insect as well as the degree of attachment of the scale to the leaf surface. Aside from cumulative mortality, the effectiveness of systemic insecticides could also be assessed using the average age of the test insect at different time periods after treatment. In this study, all treatments delayed the rate of development of CSI.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

28

Issue

2

Page

204

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

ASPIDIOTUS; SPECIES; PESTS OF PLANTS; INSECTICIDES; TOXICITY; MORTALITY; EVALUATION

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