Effects of three systemic insecticides on the survival and development of coconut scale insect, Aspidiotus sp. (Hemiptera: Diaspididae)

Date

4-2014

Degree

Bachelor of Science in Agriculture

Major Course

Major in Entomology

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Celia dR. Medina

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, thiametoxam 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.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2014 A3 /D46

Document Type

Thesis

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