%D 2005 %0 ARTICLE %T [ Effects of fungicide on temporal and spatial niches of Rhizoctonia solani ] %J %V 16 ( 8 ) %P 1493-6 %A Wang Z %A Tan G %M pub16262065 %X This paper studied the variation of the temporal and spatial niches of rice sheath blight-causing Rhizoctonia solani under spraying fungicide . The results showed that between fungicide treatments and control , the spatial niche breadth of Rhizoctonia solani was different , while its temporal niche breadth was similar . The spatial niche breadth of Rhizoctonia solani was 0 . 5240 when spraying fungicide at booting and full heading stages , 0 . 5742 at booting and milkfilling stages , and 0 . 8577 at tillering stage , while the control was 0 . 8563 . Spraying fungicide had little effect on temporal niche breath . The spatial niche breath , percentage of diseased leaves and sheathes , index of disease , and control effect all suggested that spraying fungicide two times in rice growth period was better than spraying it one time . Spraying fungicide at booting and full heading stages and at booting stage and milkfilling stages had the best effects . Fungicide could not only narrow the spatial niche breadth , limit the spread of Rhizoctonia solani on top leaves which were important for the yield , but also narrow the temporal niche breadth , limit the spread of Rhizoctonia solani during the yield formation period of rice . But , spraying fungicide only changed the distribution of the fungus niches and narrowed the niches during rice yield formation period , with no changes in the whole niches of Rhizoctonia solani .