PROBLEM TO BE SOLVED: To provide a method for preventing solidification of deposits that generate when using a water-diluted pesticide preparation by method which formation of strongly solidified deposits that hinder works and impair the effect of the pesticide preparation is prevented, and also to provide a disinfection method of seeds using the method. SOLUTION: In the method for preventing solidification of deposits, after the pesticide preparation is diluted with water, an anticoagulant is added to the diluted preparation in an amount sufficient to prevent the formation of coagulants for at least 15 minutes after the addition of the anticoagulant. In the disinfection method of seeds, an anticoagulant is added to a water-diluted seed disinfectant. The water-diluted solution is then circulated and contacted with the seeds or sprayed onto the seeds in order to disinfect the seeds.
