Degradation dynamics of a new fungicide mixture (Tricyclazole 33.3% + Azoxystrobin 16.7%) sc in/on Rice

A field trial with a new fungicide combination formulation (tricyclazole 33.3% + azoxystrobin 16.7%) SC @ 500 and 1000 mL ha⁻¹ was conducted in rice field at experimental research farm of BCKV to determine its degradation pattern in/on rice under the climatic condition of West Bengal. Three foliar applications of this fungicide formulation were made at fifteen days interval beginning with the tillering stage of rice plant. Green leaf of rice plant were collected on 0, 1, 3, 5, 7, 10, 15 days interval from treated plots along with untreated control after the third application. Residues of tricyclazole and azoxystrobin reached below determination limit (BDL) in green leaves after 5–7 and 3–5 days respectively. No residues were detected in control as well as harvested samples of grain, husk, straw and soil. Half–lives of tricyclazole and azoxystrobin were 2.13–2.51 and 0.85- 1.25 days respectively.