Dynamics and assessment of spider mite populations infesting papaya in Northern Mindanao

Issue Date

10-2012

Abstract

Incidence of field infestation and development of mites' population on papaya were monitored in Liboran, Baungon, Bukidnon using index guides for mite infestation and degree of damage. Samplings were done every other week on 20 trees from plot receiving chemical treatments (abamectin and dimethoate) and also 2 trees from the untreated plot. Stratified random sampling was conducted by taking 3 leaf samples per tree, representing the top, middle and bottom leaves. Mite population monitoring and damage assessments were started in May 2010 (two months after transplanting) and then onwards (except September 2010) for 21 months. The red spider mites, Tetranychus kanzawai Kishida, were already observed present on both treated and untreated plots when the initial sampling was done. Mite infestations and corresponding damages were generally highest on the bottom leaves and lowest on the top leaves. Progression in population development in the untreated plot showed almost the same trend, with population peaks in January and April 2011. In the treated plot, the population development data taken from the bottom and middle leaves showed the same trend, with the population peaks in October 2010 and April 2011. Generally, mite infestation was higher on the treated than on the control or untreated trees. The most common predator was Stethorus pauperculus. Possible effects of the chemicals applied on the mite predators and the changing weather patterns especially rainfall and temperature are discussed.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

26

Issue

2

Page

189

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

TETRANYCHIDAE; CARICA PAPAYA; PLANT PESTS; INFESTATION; PEST MONITORING; PHILIPPINES

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