The combination of ethaboxam and transgenic plants providesenhanced plant protection in controlling plant disease. According to thepresentinvention, an application of an effective amount of ethaboxam to transgenicplantsapplied to plant foliage parts; soil-applied in drench or soil incorporation;or applied toseed using seed slurry application, seed film coating and seed pelletingtechnologiesfor seed, gives a good controlling effect on plant diseases. Application ofethaboxamto transgenic plants encompasses all monocotyledonous and dictotyledonous croptypes.