Compound pesticide for preventing and treating wheat scab

The invention discloses a compound pesticide for preventing and treating wheat scab. The compound pesticide is prepared from phenamacril, magnesium-containing chlorophyllin salt, bacteriochlorophyll,a selenized carrageenan solution and water, and the mass ratio of the phenamacril, the magnesium-containing chlorophyllin salt, the bacteriochlorophyll, the selenized carrageenan solution and the water is (20-30):(1-2):(1.5-3):(5-20):(50-70). According to the formula for preventing and treating the wheat scab, the effect of preventing and treating the wheat scab can be remarkably improved; the drug resistance of the Fusarium graminearum to the phenamacril is greatly reduced; nutrient elements selenium and magnesium can be provided for growth of wheat, and the bacteriochlorophyll also promotesgrowth of the wheat. Compared with a wheat block field without the compound pesticide, in the same growth environment, a wheat block field utilizing the compound pesticide achieves the growth period shortened by about 10 days,