|Title:||Insights into the Biology, Diversity, and Origins of Weedy Red Rice and the Use of Phylogeographical Structures to Control its Seed-mediated Contamination in Taiwan||Authors:||Dong-Hong Wu
Jeremy D. Edwards
|Keywords:||weedy red rice;seed shattering;seed dormancy;transplanting system;control strategy||Issue Date:||Dec-2018||Publisher:||農業試驗所||Start page/Pages:||17-30||Source:||農業試驗所特刊第215號||Conference:||2018 強化作物關鍵有害生物整合管理之前瞻技術國際研討會專刊||Abstract:||
Weedy red rice (WRR) possesses traits, including seed dormancy and shattering, that
facilitate its infestation in rice paddies from one crop season to the next. These plants are not only the potential source of pollen-mediated gene flow and hosts for diseases or other pests, but also are competitors for fertilizer due to their vigorous growth. In addition to increased production costs to control this weed, the red pericarp and undesirable eating qualities of WRR lead to reduced product value, consequently putting production constraints on the global rice industry. In rice cultivation regions world-wide, the rice industry is in search of effective ways to control WRR. The rice production system in Taiwan relies on transplanting which is recommended for effective control of weeds in rice fields during the seedling stage. However, the infestation of WRR in rice paddies has become increasingly severe in the past few years in Taiwan. Although WRR occurs at a rate of only 0.5 to 1% in contaminated paddies, it can be spread easily through use of shared field equipment among rice fields. Ratoon cropping or tillage immediately after harvest increases the population densities of WRR, resulting in future yield losses. Effective control strategies for WRR should meet the balance between economic benefit, efficiency, and feasibility. The recommended WRR control measures under a transplanting system begin with irrigating the paddy field after harvest to induce the sprouting of shattered seed, followed by plowing the WRR seedlings into the land. Herbicide is then applied three times in succession every seven days to kill emerging WRR and to field infestations. The final step is the manual removal of the remaining off-type plants of WRR.
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