<![CDATA[The teh-tehan plant or Acalypha siamensis is a plant species that is familiar as a living fence which is widely planted by rural communities. The aim of this study was to make bioherbicide from tea leaves and measure the effectiveness of Acalypha siamensis infusion as a bioherbicide against bandotan weed and its effect on rice (Oryza sativa L.). Data collection used experiments by routinely spraying Acalypha siamensis infusion on bandotan weed plants using mahogany leaves, ketapang leaves and synthetic herbicides as a comparison, then tested its effect on the growth of rice plants. Data analysis used a comparative descriptive analysis by comparing the growth of weed bandotan which was sprayed with Acalypha siamensis infusion with that which was sprayed with infusion of mahogany leaves, ketapang leaves and synthetic herbicides, then proceed with comparing the effect on the growth of rice plants. The production of bioherbicide from Acalypha siamensis is carried out by the infusion method, namely boiling in water until 1/3 (one third) of the original amount of water remains. Based on the experimental results, data was obtained that natural materials such as Acalypa siamensis leaves, mahogany leaves and ketapang leaves were proven to be able to suppress the growth of bandotan weed (Ageratum conyzoides). Based on the analysis of the BNT/LSD test, data were obtained that the ability level of Acalypha siamensis was the same as mahogany leaves and ketapang leaves but was safer for rice plant growth than mahogany leaves and ketapang leaves. Keywords: Acalypha siamensis, bandotan, bioherbicide, weed, infusion, rice]]>
