Conductance distribution of fosetyl-aluminum in Torreya grandis and control efficacy on root rot
To elucidate the systemic distribution of fosetyl-aluminum in Torreya grandis and its field efficacy against root rot,HPLC-MS was employed to trace the presence of the compound across different parts of three-year-old T.grandis at 7,14,and 21 days after trunk injection.A 0.5％SL was applied to 13-year-old T.grandis through trunk injection,once annually in mid-March,over a 3-year period.At the end of the third year,the residue levels of fosetyl-aluminum in different T.grandis tissues and changes in leaf photosynthesis activity were assessed.Seven days after the 0.5％fosetyl-aluminum SL trunk injection,the compound was systemically distributed to the roots,stems,branches,and leaves,with concentrations reaching 0.51 mg/kg in the branches and stems,and 0.15 mg/kg in the roots.The three-year application achieved a remarkable 89.41％control efficacy against root rot in T.grandis.Furthermore,the trunk injection of fosetyl-aluminum increased photosynthetic pigments,including chlorophyll,while reducing heat dissipation and carotenoid content in the leaves,thereby enhancing photosynthetic capacity.This led to normal leaf sprouting,rejuvenation,and re-greening.Collectively,fosetyl-aluminum,when applied via trunk injection,can move bi-directionally within T.grandis and is an effective treatment for root rot control.
万方数据
维普
