Different insecticides in certain doses and formulations were ap‌plied in different timings against the rice stem borer and the rice leaf miner. The obtained data can be summarized as follows : Rice stem borer : Most of the tested chemicals were highly effec‌tive on the borer. Percentages of damage in the treated plots were 2.9 and 3.8% for Fipronil (10 kg/fed), 14.2 and 12.3% for Diazinon (8 kg/ fed) in 1994 and 1995 seasons, respectively. Fipronil at the rate of 10 kg/fed followed by Furadan (6 kg/fed) and Novadrin (1.5 lit/fed) seemed to be the most effective insecticides. They reduced damage by 81.8, 78.1 and 51_3% in 1994, and 71.2, 69.7 and 56.8% in 1995 season, respectively. Applying insecticides at 50 or 70 days after transplanting was ef‌fective in reducing the damage, but at the later timing, insecticides were more effective. Rice leaf miner: Based on the percentage of the damaged leaf area parameter, Furadan at the rate of 6 kg/fed and Novadrin (1.5 Lit/ fed) were the most effective insecticides with the least damage (1.7 and 1.9% in 1994 and 1.6 and 1.7% in 1995), respectively. Dursban (4.5 kg/fed) and Sevin (16 kg/fed) showed intermediate effectiveness. Based on either infestation parameter or severity parameters, Fu‌radan (6 kg/fed) and Novadrin (1.5 lit/fed) were the most effective in‌secticides against the rice leaf miner.