TO PROVIDE A COPULATION DISRUPTION AGENT FOR SAP-SUCKING PESTS WHICH ARE CONSIDERED TO BE THE PRINCIPAL PESTS IN RICE CULTIVATION. THE PRESENT INVENTORS HAVE FOUND THAT BY APPLYING FLONICAMID TO SAP-SUCKING PESTS IN THE RICE FIELDS, IT IS POSSIBLE TO DISRUPT THE COPULATORY BEHAVIOR OF THE PESTS AND TO PROVIDE A STABLE AND HIGH CONTROLLING EFFECT OVER A LONG PERIOD OF TIME. THIS IS A COMPLETELY UNPREDICTED EFFECT, DISTINCTLY DIFFERENT FROM THE SIMPLE PESTICIDAL USE OF FLONICAMID. THE PRESENT INVENTION RELATES TO A COPULATION DISRUPTION AGENT FOR SAP-SUCKING PESTS PARASITIC ON RICE, WHICH COMPRISES FLONICAMID AS AN ACTIVE INGREDIENT, A METHOD FOR DISRUPTING THE COPULATORY BEHAVIOR OF THE PESTS, WHICH COMPRISES APPLYING THE COPULATION DISRUPTION AGENT. FIGURE 1.