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Rice Blast Control and Polyvarietal Planting in the Philippines: A Study in Genotype by Environment Biogeography

Author(s): Daniel J. Falvo

Journal: Social Science Diliman
ISSN 1655-1524

Volume: 2;
Issue: 1;
Start page: 43;
Date: 2001;
Original page

Keywords: rice blast control | polyvarietal planting | biogeography | Philippine agriculture | rice agriculture

Current approaches to biogeography are based on organismic biology. Certain biogeographical phenomena, however, cannot be fully understood using organismic approaches to biogeography. I employed an approach based on molecular biology and biochemistry that I call genotype by environment biogeography in order to provide a more complete understanding of why the dispersal of rice blast disease is less efficient in fields planted with mixtures of rice varieties. In a case study of an upland ricefield in the Philippines, I found that planting varietal mixtures results in a form of effective blast control that I call intrafield gene deployment. I suggest that intrafield gene deployment be used to design more effective methods of blast control in intensive rice agriculture.

Tango Jona
Tangokurs Rapperswil-Jona

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