Evaluation of local clay particles as coating agents against cacao mirid bug

Issue Date

10-2017

Abstract

Efficacy of clay particles as a coating agent for the control of cacao mirid bug was evaluated. Preliminary experiment compared local clay particles as a coating agent of pods to repel Helopeltis bakeri Poppius, with the commercially available particles such as local kaolin, zeolite, bentonite, and the US kaolin (commercially available particle film). Coating with plain water, and commercial synthetic insecticide were included as negative control and positive control, respectively in order to determine the most efficient among the local clay particles in protecting the pods from H. bakeri feeding. US kaolin-coated pods had the fewest feeding punctures followed by the local zeolite. Pods sprayed with water had the highest number of feeding punctures. All insects in cacao sprayed with insecticides died. Cacao mirid bugs in all clay particle coated pods were alive. The commercial particle film, US kaolin has a particle size of 0.4 microns which is very fine as compared to the local clay particles, which ranged from 25-32 microns. Thus, complete coating coverage of the pods was attained using US kaolin and therefore exhibited more repellent action against mirid bugs. Refining the particle size of the local clay particles will be done to further evaluate their efficacy as coating agents of the cacao pods to manage pests.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

31

Issue

2

Page

155-156

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

HETEROPTERA; MIRIDAE; CLAY, PROTECTIVE COATINGS; COATING; PEST CONTROL; PODS, AGENTS, REPELLENTS; PEST REPELLENTS; KAOLINITE, ZEPLITES, BENTONITE

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