Use spray water with a pH between four and seven for best results. Other microbials are available that work as fungicides, such as Mycostop, a soil drench derived from Streptomyces fungus, and Gliogard, derived from Gliocladium fungus. Both these products are labeled to control some root rotting organisms that cause damping off and similar problems in seeded crops. Synthetics available to organic growers include soaps and horticultural oil. The latter are not allowed by all certification groups.
Soaps work by smothering soft-bodied insects like aphids or thrips.
Application directly onto exposed insects is critical to good control. Soaps can be phytotoxic to some crops, and harmful to some beneficials. All that's missing is a label for the use of baking soda as a fungicide. Minerals such as sulfur and copper are the primary organic fungicides and bactericides used to prevent disease in the field. With a good spray program and cultural practices that maximize leaf drying, organic growers may achieve effective prevention.