Survey of dominant weed species in the Philippine irrigated lowland rice fields
2019
Garcillano, M.C. | Marquez, L.V. | Martin, E.C.
Weeds are one of the constraints when growing and achieving higher yields of cultivated plants. This group of pest could reduce yields of rice up to 96% when uncontrolled. Knowing the kind of weeds infesting the rice fields is one of the prerequisites of effective weed management. This information, however is limited in the Philippines. A survey was conducted in 1,679 rice fields (monitoring fields) across all regions of the Philippines from July to December 2018, to determine the most common weeds of rice in the country. Monitoring fields with at least 200 m2 were sampled monthly by randomly placing three 1 x 1 m quadrat. Data on dominant weeds based on weed cover and weed species were collected and analyzed. Results of the survey showed that Echinochloa glabrescens (14.58%), Echinochloa crusgalli (11.71%) and Cyperus difformis (10.14%) were the top three most dominating weed species in the Philippine rice fields. Strategies for controlling these weeds must be properly identified, designed, and implemented when considering weed management at a national scale.
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