The invention relates to a combined bactericide and application thereof in preventing and treating rice bacterial streak, and belongs to the technical field of
pesticide compounding. The combined bactericide comprises nano
zinc and
copper oxychloride in a
mass ratio of (3-15): (15-35), and further comprises a
pesticide adjuvant and a
solvent, the nano
zinc is
zinc oxide powder with the particle size of less than 100nm; the
copper oxychloride is
powder with the
fineness of 2-5 microns. The combined bactericide can be used for preventing and treating rice bacterial diseases, and the rice bacterial diseases are rice bacterial streak. The nano zinc and the
copper oxychloride are broad-spectrum fungicides and are wide in application range, the compounded composition has a synergistic effect, the nano zinc has protection and treatment effects on plants, the
disease resistance of the plants can be enhanced, the tolerance of the plants can be improved, the
control effect can be further improved through the characteristic, and the effect is obviously higher than that of a
single agent of the
copper oxychloride, so that the composition is worthy of popularization and application. And the composition can be well mixed with other chemical pesticides.