بررسي پراكندگي و ميزان آلودگي گونه هاي sporisorium روي ذرت خوشه اي در منطقه اردستان و مقايسه اثر چند قارچ كش جهت كنترل آن ها

Investigation on distribution and infection of sporisorium species attacking sorghum in Ardestan region and comparision of some fungicides for its control

In this study, identification of varios species of Sporisorium the causal agent of sorghum amuts , its distribution, rate of yield losses and possible of chemical control by seed treatment were investigated.On the basis of morphological and kind of infection, there species of Sporisorium such as : S. sorghi the causal agent of covered kernel smut with frequency of 31.5 % ., S. ehrenbergii the causal agent of long smut with frequency of 28% and S. reilianum the causal agent of head smut with frequency of 7.5 % for the first time was identified from two egions. Mean of panicle infection to covered kernel, long and head amuts were : 58.8, 9.6 and 100 percent respectively. The effectiveness of three fungicides as seed treatment including triadiminol 7.5%, dinniconazole 2% and carboxyinthiram 75% at the rate of 1.5, 2 and 1.5 grams per kilogram seedvx were used. The experiments were conducted in complete randomized design with 4 treatments and 4 replication. Percentage of infected panicles were calculated and after changing datas to Arcsin were compared by using Duncanʹs Multiple Range Test. The results showed that all the fungicides were controlled the coverd kernel and head smuts effectively and were significant difference between fungicides treatments and control.