Morpho-quantitative analysis and severity assessment of Uromycladium falcatarium across elevation gradients and stand ages of falcata plantations in Mindanao, Philippines
Paper Details
Morpho-quantitative analysis and severity assessment of Uromycladium falcatarium across elevation gradients and stand ages of falcata plantations in Mindanao, Philippines
Abstract
The study was conducted to assess the teliospore morpho-quantitative variations and severity of Uromycladium falcatarium Doungsa-ard, McTaggart, Geering & R.G. Shivas causing gall rust disease across elevations and stand ages of falcata plantations in Mindanao. Two falcata plantations were identified across elevations from Low (0-400 m asl), Moderate (>400-800 m asl), and High (>800 m asl) and were classified as non-harvestable (<5yo) and harvestable (>5yo) for the stand ages. Likewise, matured galls were also collected from each plantation for microscopic analysis of the fungal teliospores. The result revealed a significant increase in disease severity (P<0.01) of gall rust in Falcata and teliospore length (P<0.05) of the fungus as influenced by an increasing elevation from 400 m asl and above. Meanwhile, the teliospore width (P<0.05) and wall thickness (P<0.05) significantly varied between stand ages which revealed a wider width in harvestable (>5yo) and thicker wall in non-harvestable (<5yo), respectively. In addition, gall rust severity revealed a significant relationship between elevation and teliospore characteristics that correspond to the survival and prevalence of the fungus. This study provides substantial information and input in understanding the pathogen characteristics and survival under field conditions.
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