Start Date: Jul 30, 2009
End Date: Sep 30, 2010
Evaluate the effectiveness of microbial biological control antagonists, substances classified as GRAS, certified organic, or reduced-risk compounds and thermal treatments in controlling significant postharvest pathogens of citrus fruit and grapes using laboratory assays. Promising treatments will then be included in large scale semi-commercial tests with cooperators to optimize their efficacy and assess their commercial feasibility. Assess resistance to gray mold (Botrytis cinerea) and powdery mildew (Uncinula necator) among grape selections using laboratory and field evaluations. Constitutive or inducible biochemical constituents and morphological features from these selections will be quantified to determine their contribution to disease resistance. Subject lemons to various durations and degrees of heat treatments and assay areas of the peel that show incipient injury for antioxidant status as well as for signs of oxidative injury. Measure fruit volatiles and quality factors such as brix and acidity and relate to the palatability of the fruit as influenced by time of harvest and various postharvest handling treatments. Replacing 5302-43000-032-00D (6/12/09).