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F. dichotoma has many similarities to F. miliacea and can be controlled in much the same way (see the data sheet on this species).
The key to successful cultural control in rice is the establishment of a competitive crop stand. This includes the sowing of weed-free crop seed into a clean seedbed, use of competitive varieties (fast growing, tall and leafy varieties) and maintaining a healthy crop.
Inter-row cultivation is an effective, though somewhat laborious, method of control. This should be done when the F. dichotoma is a seedling or small plant and before it competes with the crop. Hand-pulling can be applied to large plants but, by then, the crop will have suffered modest competition.
Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:
A heavy infestation of F. dichotoma in a rice field affects productivity by competing for nutrients, causing plants to lodge and making mechanical harvesting almost impossible. It is also costly to control the weed.