Persistence of Combination Product Ipconazole 25% + Metalaxyl 20% ME in Maize

Persistence of ipconazole and metalaxyl is reported in the seedling, cob and mature grain of maize following seed treatment with their combination product. Ipconazole residues persisted till 2^nd and 5^th day in the seedling after emergence at recommended and double the recommended doses, respectively. The corresponding persistence of metalaxyl in the seedling was observed till 5^th and 10^th day after emergence. At harvest the residues of both the fungicides were below determination limit of 0.01 μg g⁻¹ in cob, matured grain and soil at either dose of seed treatment. The dissipation of ipconazole and metalaxyl followed first order kinetics with halflife ranging from 1.43–3.14 and 1.28–2.32 days, respectively.