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Description
Two hundred trucks were assayed for mold with three different methods over three sampling periods (mid-September, end-September, mid-October) during the 1991 harvest. A dedicated crew of CDF A inspectors sampled all of the trucks using the standard visual method for determining mold. Also at the stand, a rapid Immunoassay test was used to identify the level of Botrytis cinerea in juice taken from the sugar sample. Duplicate samples were frozen for further laboratory analysis using ELISA to quantify the level of antigen. The three methods were then compared to each other in simple regression analyses of non-transformed data. The best correlation between the ELISA lab assay and the CDFA assay (r = 0.83, n = 65) occurred when white grapes were hand-harvested, probably the best situation for the CDF A visual inspection. Minor differences among the assays occurred when mold was below 1 . Larger differences occurred when mold was above 3 .
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