Evaporation inhibitor for plant treatment agents

A method for treating a plant, comprising applying to the plant a treatment liquid that comprises:

• a plant treatment agent, and
• an evaporation inhibitor consisting of (A) at least one compound selected from the group consisting of compounds (AI) to (A6) [hereinafter referred to as component (A)]:
• <compound (AI)>
• a compound obtained by adding at least one alkylene oxide (hereinafter referred to as AO) selected from the group consisting of ethylene oxide (hereinafter referred to as EO) and propylene oxide (hereinafter referred to as PO) at an average number of added moles of 1 or more and 22 or less to a compound of formula (I):
• wherein in the formula (I), R1 is an alkyl group with 10 or more and 14 or less carbons or an alkenyl group with 10 or more and 14 or less carbons;
• <compound (A2)>
• a compound obtained by adding at least one AO selected from the group consisting of EO and PO at an average number of added moles of 1 or more and 22 or less to a compound of formula (II):
• wherein in the formula (II), R2 is an alkyl group with 11 or more and 19 or less carbons or an alkenyl group with 11 or more and 19 or less carbons;
• <compound (A3)>
• a compound obtained by adding at least one AO selected from the group consisting of EO and PO at an average number of added moles of 1 or more and 22 or less to a monoester of a fatty acid with 10 or more and 20 or less carbons and sorbitan;
• <compound (A4)>
• a polyalkylene glycol with a weight average molecular weight of 100 or more and 3000 or less;
• <compound (A5)>
• a compound represented by formula (III):
• wherein in the formula (III), R3 is an alkyl group with 15 or more and 19 or less carbons, and R4 is an alkyl group with 1 or more and 18 or less carbons;
• and
• <compound (A6)>
• a compound represented by formula (IV):
• wherein in the formula (IV), R5 is an alkyl group with 7 or more and 19 or less carbons or an alkenyl group with 7 or more and 19 or less carbons,
• wherein the treatment liquid is applied to the plant by aerial spraying using a sprayer selected from the group consisting of an industrial unmanned helicopter and an industrial multirotor
• wherein the treatment liquid further comprises (B) an agrochemical efficacy enhancing agent comprising:
• (B1) represented by the following formulas (V) and (VI):
• wherein in the formulas (V) and (VI)
• R6 and R7 are each independently a hydrocarbon group;
• R8 is an alkylene group with 2 or more, and 4 or less carbons;
• n is an average number of added moles;
• and
• M+ is a counterion, and
• (B2) a (poly) glycerin fatty acid ester.