The invention discloses application of a 2,5-di(substituted formamyl methylthio group)-1,3,4-thiadiazole compound in inhibiting blue-
green algae growth, and belongs to the field of agricultural production and
environmental protection. The structure of the 2,5-di(substituted formamyl methylthio group)-1,3,4-thiadiazole compound is as shown in a formula I, and R1, R2, R3, R4 and R5 in the formula I each adopt any one radical group of
hydrogen or a
halogen or an
alkyl group or a hydroxyl group or
trifluoromethyl or a nitro group. The compound has a good inhibiting effect on blue-
green algae fructose-1,6- /
sedoheptulose-1,7-biphosphatase; a good inhibiting effect on blue-
green algae is achieved, and the compound can serve as the effective component of algicide to be applied to comprehensive treatment of blue-green
algae bloom. The compound can be mixed with an allowable carrier in a
water body or a
diluent to be prepared into various commonly-used dosage forms such as a water mixture, an
emulsion, an
aqueous solution and a
mobile agent to serve as the algicide for use. Please see the formula I in the description.