Influence of Thiamethoxam + Difenoconazol + Fludioxonil and time of conservation on rice seed germination

Seed treatment has become of a great importance on principal crops, especially on intensive cropping, where sanitary protection is necessary from the days just after germination up to advanced growth stages of the crop. This experiment was carried out at the Entomology Laboratory of “Sur del Jibaro” Rice Experimental Station, Sancti Spiritus, Cuba, from July 28, 2009. Seed treatment with formulation of Thiamethoxam (262.5 g a.i./l) + Difeconazol (25 g a.i./l) + Fludioxonil (25 g a.i./l), equal to 312.5 g a.i./l FS as a total, was applied to one kilogram of rice seed, variety J-104, utilizing the two proposed doses to evaluate (60 and 100g a.i./100 kg of seed). 100 rice seeds were placed in Petri dishes. Four days after this, germination percentage was evaluated. A control (without chemical treatment) and four replications were utilized. Same day of pesticide application, germination percentage was between 87.6 and 89.6. Fifty days after seed treatment with 100 g a.i./100 kg of seed, germination percentage was 74.3, even by that time, remainder treatments were over 80%. Up to this time seed is not allowed to be used according to Cuban Technical Instructions for rice culture.