The aim of this study was to investigate the effect of treatment with insecticides

and fungicides on the physiological quality of corn seeds, classified in sizes, in different periods

of storage. Seeds of the hybrid BM915 PRO, classified in two sizes (CH20/64 and CH24/64),

were treated with a mixture of carbendazim + thiram (Derosal Plus®), pirimiphos methyl

(Actellic®), deltamethrin (K-obiol®), and water (standard treatment). In addition to the standard

treatment adopted by the company, treatments with clothianidin (Poncho®), thiamethoxam

(Cruizer®), and fipronil (Shelter®) were added to the spray mixture. The seeds were stored in a

non-climate-controlled environment in multi-ply paper packages. The physiological quality of

the seeds was evaluated every ninety days over a period of 270 days by the germination test,

cold test, and accelerated aging. Sanitary quality was also evaluated through the Blotter test.

The physiological quality of seeds of the hybrid BM915 PRO is maintained up to ninety days of

storage, regardless of the chemical treatment used and the size of the seeds. The addition of

the insecticide to the standard treatment used in chemical seed treatment does not affect the

action of the fungicides on the fungi in the seeds.