control agent that has an excellent control effect against mites of the order mesostigmata and has as its effective components a specific compound derived from quinoline such as 8-fluoro-2,3-dimethyl-6- (1,1-dimethylethyl) -4 - (methylcarbonyl) oxyquinoline, azoxystrobin, picoxystrobin, pyraclostrobin, cresoxim-methyl, trifloxystrobin, metominostrobin, orisastrobin, famoxadone, fluoxastrobin, pyribencarb, ciazofamide, amisulbrom, fluorametam, fluolamide, fluolamil, flutolanil, flutolanil, flutolanil penthiopyrad, boscalid, diflumetorim, fluazinam, ferinzone, fenpyroximate, or an acid addition salt of these compounds.agente de controle que apresenta um efeito de controle excelente contra ácaros da ordem mesostigmata e tem como seus componentes eficazes um composto específico derivado de quinolina tal como 8-fluoro-2,3-dimetil-6-(1,1-dimetiletil)-4-(metilcarbonil) oxiquinolina, azoxistrobina, picoxistrobina, piraclostrobina, cresoxim-metílico, trifloxistrobina, metominostrobina, orisastrobina, famoxadona, fluoxastrobina, pyribencarb, ciazofamida, amisulbrom, flutolanil, mepronil, isofetamida, fluopyram, carboxina, tifluzamida, fluxapyroxad, furametpyr, penflufen, penthiopyrad, boscalid, diflumetorim, fluazinam, ferinzone, fenpiroximato, ou um sal de adição de ácido destes compostos.