Status of BT corn insect resistance management (IRM) in the Philippines
2007
Cuaterno, W.R., Bureau of Plant Industry - Dept. of Agriculture, San Andres, Manila (Philippines) | Cayabyab, B.F., Philippines Univ. Los Banos, College, Laguna (Philippines). National Crop Protection Center
The Bureau of Plant Industry (BPI) is the agency of the Department of Agriculture (DA) mandated as per Administrative Order No.8 series of 2002 to regulate the importation and release into the environment of plants and plant products developed using Biotechnology. Akin to this, the BPI has to play an active role in implementing the appropriate Insect Resistance Management Strategy (IRM) in relation to the commercial release of BT Corn Mon 810 in December 2002. IRM refers to the deployment of combination of strategies designed to reduce the risk target insect (Asian Corn Borer) developing populations resistant to the product (BT corn plant). As per expert advise of DA's pool of scientists on IRM, revisions on the agreed High Dose-Refuge IRM Strategy are made as deemed necessary. The important aspects being considered are: 1. High Dose-Refuge IRM Strategy for BT Corn. The high dose guarantees over 99% mortality of ACB, while the refuge serves as source of BT-susceptible insects that can make with the less than 1% resistant individuals that may emerge from BT corn to maintain susceptibility of the succeeding ACB generation. 2. The Refuge Component of the IRM Strategy. Refuge can either be structured or unstructured depending on the following considerations: (1) level of BT corn adoption in an area, (2) size of BT corn farms, (3) presence of alternate host crops and weeds around the corn fields which can support the population of susceptible ACB, and (4) farmer practice of crop rotation or diversified farming such as intercropping which can serve as temporal or spatial refuge. Based on the reports received from the field for 2006, there are now a total of 162,050 hectares of corn fields planted with Bt corn. No ACB resistance development has been observed in the field.
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