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Seed treatment to control soil insects that attack the germinating rice seedlings

Five comparative tests were carried out to compare the efficiency of two insecticides applied to rice seeds prior to sowing to control the attacks of termite (Cornitermes, spp.) and lesser cornstalk borer Elasmopalpus llgnosellus(Zeller 1918) on the germinating seedlings. The insecticides tested were: (1) Birlane 25% WP at the rates of 400 g and 600 g per 60 kg of seeds; (2) Aldrin 40% WP at the rate of 400 g per 60 kg of seeds; and (3) a mixture Aldrin 27% a. i. and Birlane 25% of equal parts of the two at the rate of 400 g per 60 kg of seeds. These four treatments and the control were compared in five different localities (two rice growing areas in Minas Gerais and three in São Paulo). Four tests were planted in 5 x 5 Latin aquares and the fifth as a randomized block with five replications. The average results from the five tests indicate that all treatments were effective in increasing the stand of the plots when compared with the controls. The yields of the treated plots were higher than that of the respective controls, but the differences were not statistically significant.


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