ABSTRACT
In this chapter, the author describes pioneering work on biocontrol of diseases of harvested fruit, and some attempts to control fruit diseases in the field with the intent of extending its effect after harvest. Recovery of viable Trichoderma from harvested fruit indicated the ability of the applied fungus to survive in the field. However, variations in tolerance to low temperature were observed, which probably accounts for variations in effectiveness among isolates. Knowing the nutritional requirements of an antagonist would be important in manipulating its population; also, knowing pH and nutrient composition on the fruit surface would help in the selection of proper antagonists. Drought resistance of microorganisms is a major factor affecting fruit biocontrol development. Yeasts, unlike many bacteria, can colonize the surface for long periods under dry conditions. Large amounts of extra-cellular polysaccharides contribute to their survivability. Yeasts are also organisms on which pesticide impact is minimal.
