The invention relates to the technical field of green biological control, and particularly discloses a
disease and pest resistant nutritional spray based on a
selenium additive and a preparation method thereof. The
nutrient spray capable of resisting diseases and
insect pests comprises an organic
selenium compound, a
plant source
disease-resistant component, a
nutrient component, a surfactant, a
permeation auxiliary agent, a pH
regulator and the balance of deionized water, the preparation method comprises the following steps: preparing the
selenium additive solution and the
plant source
disease-resistant extract, mixing the selenium additive solution and the
plant source disease-resistant extract, adding the surfactant and the
permeation additive for emulsification, then adding the
nutrient components, stirring for dissolving, adjusting the pH value, fixing the volume, and filtering to obtain a finished product. The composition can be used for
plant disease and
insect pest resistance protection and
nutrition supplement of crops, and has the advantages of
plant disease and
insect pest resistance,
nutrition supply and stable dispersion of effective components; besides, the preparation method disclosed by the invention is optimized through step-by-step operation, has the advantages of being controllable in operation and capable of guaranteeing the activity of the effective components, and meets the production requirements of green
agriculture.