PRESERVATIVE EFFECTS OF IPRODIONE ON SHELLED CORN

Laboratory tests were conducted to determine preservative effects of i prodione (Rovral(R)) fungicide on shelled corn. One-kilogram corn samp les were held at 20 degrees C, and 18.0, 22.5, and 23.5% moisture whil e being aerated at 0.45 m(3)/min-Mg (0.4 cfm/bu). Time required for th e samples to lose 0.5% of original dry matter was used as the criterio n of preservative effectiveness. Application of 20 ppm of iprodione ex tended this time 21% for 18% moisture corn and 13% for 22.5% corn. Eff ectiveness of iprodione increases with application rate up to 100 ppm where storage time is extended about 25%. A higher application rate ha d little added effect. The 3.29 ml/kg (3 oz/bu) fungicide solution rat e is more effective than the 5.48 ml/kg (5 oz/bu) rate. Non-uniform ap plication of iprodione did not decrease preservative effectiveness if the same total quantity of fungicide was applied. Damaged kernel total s after storage tests were higher for 22.5% moisture samples, compared to 13% moisture samples, but were not affected by iprodione treatment .