Variability in response to insecticides of field populations of diamondback moth, Plutella xylostella (Linnaeus), in the Philippines

Creator

Gabriel M. Sarmiento, BASF Agricultural Research Foundation, Inc.
Virginia R. Ocampo, University of the Philippines Los Banos

Issue Date

4-2010

Abstract

Three populations of the diamondback moth (DBM), Plutella xylostella (Linnaeus), from crucifer-growing areas in the Philippines were tested for susceptibility to 14 formulated insecticides. The leaf dip assay was used on third instar larvae of the pest. The 72-hr LC₅₀ values were compared to those of a reference susceptible strain (BRL Sus st). Computed resistance ratios for the three populations showed varied responses in range and levels of resistance to the insecticides. The populations from Atok, Benguet (7400 fasl), Majayjay Laguna (1000 fasl) and Calamba Laguna (100 fasl) still had very low level of resistance to new insecticide molecules such as flubendiamide, chlorantraniliprole, chlorfluazuron, chlorfenapyr and diafenthiuron, and to the microbial formulation Bacillus thuringiensis var kurstaki. On the other hand, all three populations showed very high level of resistance to cypermethrin and to malathion. LC₅₀ determination for malathion was discontinued when the populations showed no mortalities up to 3555 ug/L. For the remaining test insecticides - cartap, indoxacarb, spinosad, fipronil, methamidophos and teflubenzuron - responses of the three populations in terms of LC₅₀ values when compared to that of the reference population vary, ranging from very low to very high level. Discriminating doses (LC₈₀-LC₉₀ values) for the formulated insecticides are also proposed as input in development of insecticide resistance monitoring system for DBM.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

24

Issue

1

Page

39-76

Document Type

Article

Frequency

semi-annually

Physical Description

illustrations; graphs; tables; map

Language

English

Recommended Citation

Sarmiento, Gabriel M. and Ocampo, Virginia R., "Variability in response to insecticides of field populations of diamondback moth, Plutella xylostella (Linnaeus), in the Philippines" (2010). Journal Article. 5368.
https://www.ukdr.uplb.edu.ph/journal-articles/5368

En – AGROVOC descriptors

PLUTELLA XYLOSTELLA; DIAMIDES INSECTICIDES; INSECTICIDES; INSECTICIDE RESISTANCE; PHILIPPINES