Plant pathology research at UOG

Western Pacific Tropical Research Center plant pathologists are engaged in research of the diseases of traditional Pacific island plant crops as well as other plants under propagation in the islands. Given Guam's unique environment and endemic plant species, much of our lab's work is on pathogens unique to Guam.

The Plant Pathology Lab utilizes a combination of classical microbial culturing techniques and molecular diagnostics to identify pathogens. 

Why it's important

Ecological and agricultural needs in Guam guide the scientific study of plant diseases. Guam’s tropical environment supports several diverse ecosystems with many uncommon and unique native plant species. These plant species are habitat and nutritional sources for higher organisms, such as the Marianas fruit bat and the endangered Mariana eight-spot butterfly. Similarly, these same plants are utilized in local CHamoru diets and traditional healing practices.

As a regional transport hub, international movement of cargo in and out of Guam exposes the island and region to foreign plant disease. Non-native agricultural crops and a robust ornamental plant trade contribute to the island’s plant diversity but also carry additional biosecurity risk.

Plant diseases are caused by pathogens (biotic) and environmental conditions (abiotic). Plant pathogens threaten many native species, yet they remain largely unidentified and undocumented. 

Sustainability of the island’s flora requires a higher understanding of the pests and diseases that threaten their health, and rapid identification of these pathogens creates better informed actions on quarantine and eradication. 

Past impacts

Work in the Plant Pathology Lab under previous faculty researchers Dr. Andrea Blas and Dr. Robert Schlub has resulted in:

• the development of improved varieties of papaya targeted for Guam's environment and consumer preferences 
• identifying the Ageratum yellow vein virus, which was causing some local farmers to lose their whole tomato crops
• a deeper understanding of brown root rot in the trees of Guam's limestone forests
• the identification and promotion of cucumber cultivars resistant to Anthracnose disease