• Dr.T.SIVAKUMAR.
• A.MUTHUKUMAR
• K. SANJEEVKUMAR
• P. BALABASKAR
• S.SUDHSSHA

Abstract Rice blast caused by (Pyriculariaoryzae) is the major disease affecting the rice production. In the present investigation study of bioefficacy and phytotoxicity of Azoxystrobin 120 + Tebuconazole 240 SC against Blast (P. oryzae) diseases in Rice. The field experiment was conducted at Killimangalam village, Cuddalore dt., Tamilnadu. The treatments, Azoxystrobin 120 + Tebuconazole 240 SC @ 830ml/ha reduced the blast incidence to the minimum with a PDI of 04.11, 04.09 and 04.16 per cent after first, second and third spray respectively. This was followed by Azoxystrobin 120 + Tebuconazole 240 SC @ 676 ml/ha which recorded 04.71, 04.69 and 04.76 per cent blast incidence after first, second and third spray respectively. Azoxystrobin120 + Tebuconazole 240 SC @ 520 ml/ha and the market standards Tebuconazole 25.9 % EC @ 750 ml/ha,Hexaconazole 5% EC @ 1000 ml, Kitazin 48% EC @ 0.20% and Kresoxim-methyl 44.3% SC @ 500 ml were on par with each other in reducing blast disease incidence. While the untreated control recorded the maximum PDI (16.21, 27.12 and 35.24 per cent after first, second and third spray observations respectively).Similarly the treatment with Azoxystrobin 120 + Tebuconazole 240 SC @ 830ml/ha recorded the maximum grain yield with 48.42 q/ha and maximum straw yield with 40.21q/ha which was at par with Azoxystrobin 120 + Tebuconazole 240 SC @ 676 ml/ha & 520 ml/ha. The untreated control recorded the lowest yield with 30.11q/ha of grain yield and 27.63 q/ha of straw yield. The occurrence of natural enemies population were not affected in the plots treated with Azoxystrobin 120 + Tebuconazole 240 SC @ 830ml/ha Phytotoxicity .The use of Azoxystrobin 120 + Tebuconazole 240 SC fungicide is found to be safe to chilli crop and none of the symptoms like chlorosis, necrosis, scorching, epinasty and hyponasty symptoms were recorded even at the highest dosage of treatment viz., 3320 ml/ha and up to 10 days of after I,II and III spraying

Keywords:Azoxystrobin+Tebuconazole,paddyBlast(Pyriculariaoryzae,)bioefficacy, andPhytotoxicity

"Study of bio efficacy and phytotoxicity of Azoxystrobin 120 + Tebuconazole 240 SC against Blast (Pyriculariaoryzae) diseases in Rice", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.202-212, June-2019, Available :http://www.jetir.org/papers/JETIR1906813.pdf

"Study of bio efficacy and phytotoxicity of Azoxystrobin 120 + Tebuconazole 240 SC against Blast (Pyriculariaoryzae) diseases in Rice", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp202-212, June-2019, Available at : http://www.jetir.org/papers/JETIR1906813.pdf