Field bioefficacy of maize bt11 against ostrinia furnacalis (Guenee) using Isabela and South Cotabato populations

Issue Date

10-2017

Abstract

The Asian corn borer (ACB), Ostrinia furnacalis (Guenee), has always been the major pest of corn before Bt corn was introduced almost 15 years ago in the Philippines. High levels of field infestation could reduce yield up to 100%. The insect-resistant and herbicide tolerant Bt11 became the second Bt corn hybrid in the country and has been available commercially for 12 years. The Department of Agriculture-Bureau of Plant Industry included it in its Lists of Approval Registry. Efficacy and other studies are required for biosafety permits for direct use of Bt11 as food, feed, or for processing and propagation. Field efficacy of the specific single trait Bt11, was studied, including its isoline as susceptible control, against the ACB. Experiments were conducted in Carabatan Punta, Cauayan, Isabela, and San Isidro, General Santos City, South Cotabato, at the vegetative and reproductive stages of corn under artificial infestation. The 100-whole plant field assay was employed where all the 168 plants in a plot were infested with 50 second instar larvae using the barbeque infestation technique. The 100 middle test plants were rated for leaf and stalk feeding at 5 and 10 days after infestation (DAI) and dissected at 15 DAI for larval recovery. All trial sites and stages showed that larvae and pupae were recovered from infested non-Bt plants but none from Bt plants. This demonstrates that the single trait Bt11, remains effective against the ACB. The 100-whole plant field assay can be recommended as a standard protocol for resistance monitoring.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

31

Issue

2

Page

159-160

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

MAIZE, TRANSGENIC PLANTS; OSTRINIA FURNACALIS; BACILLUS THURINGIENSIS; INSECTA; PESTS; PEST OF PLANTS; PEST INSECTS; PEST; RESISTANCE TO; INFESTATION; BIOSAFETY; BACTERIAL PESTICIDES; FIELD EXPERIMENTATION; HERBICIDES; EXPERIMENTAL INFECTION

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