Study of bioefficacy and phytotoxicity of azoxystrobin 120 + tebuconazole 240 SC against sheath blight (Rhizoctonia solani) diseases in Rice

Abstract

Sheath blight of rice incited by Rhizoctonia solani is one of the major important disease. In the present investigation study of bioefficacy and phytotoxicity of Azoxystrobin 120 + Tebuconazole 240 SC against Sheath blight (R solani) diseases in Rice. The field experiment was conducted at Killimangalam village, Cuddalore dt., Tamil nadu.The treatments with new combination fungicide, Azoxystrobin 120 + Tebuconazole 240 SC @ 830 ml/ha recorded the minimum sheath blight incidence with 11.34, 11.04 and 10.95 per cent after first, second and third spray respectively. This was followed by the dosage level with Azoxystrobin 120 + Tebuconazole 240 SC @ 676 ml/h which recorded 11.23, 11.13and 11.09 per cent after first, second and third spray respectively. While the untreated control recorded the maximum PDI (29.80, 37.75, 50.71) was recorded. Similarly Azoxystrobin 120 + Tebuconazole 240 SC @ 830 ml/ha recorded the maximum grain yield with 48.35 q/ha and maximum straw yield with 39.98 q/ha which was followed by the treatment Azoxystrobin 120 + Tebuconazole 240 SC @ 676 ml/ha with grain yield with 46.56 q/ha and maximum straw yield with 38.24 q/ha. Further the treatments with new combination fungicide no phototoxic consequence and was also found safe to the crop as it did not influence the natural enemy population.