<p>Disclosed is a parasitic plant control agent comprising thiadinil or the like as an active ingredient. Also disclosed is a method of the utilization of the parasitic plant control agent, which is characterized in that an effective amount of the parasitic plant control agent is applied to a parasitic plant or a soil. It becomes possible to control a parasitic plant that parasites in a crop effectively. As a result, the yield of the crop can be recovered to the same level as that achieved when the plant has no parasitic plant. The parasitism of a parasitic plant can be highly prevented, and therefore the occurrence of a next generation of parasitic plant can also be prevented. Thus, the level of contamination with a parasitic plant in an agricultural field can be decreased while cultivating a sensitive crop in the agricultural field.</p>
