MAN­AGE­MENT Fly spray savvy

EQUUS - - Consultant­s -

Q:After I ride, I of­ten hose off my horse, par­tic­u­larly on hot days. Then I ap­ply fly spray be­fore turn­ing him out. But I al­ways do my best to dry him off be­fore spray­ing on the fly re­pel­lent. Is this nec­es­sary?

If I sim­ply ap­ply fly spray to my horse when his coat is wet, what would hap­pen to the ac­tive in­gre­di­ent as his coat dries? Would it dis­si­pate so much it would be less ef­fec­tive? Or would the chem­i­cal be­come more con­cen­trated, pos­si­bly be­com­ing harm­ful? I won­der about this every sum­mer.

Name with­held by re­quest

A:You need not worry about ap­ply­ing fly spray when your horse’s coat is wet or damp, as long as it’s not drip­ping wet. The rec­om­mended amount of pyrethrin to be ap­plied is de­ter­mined by the con­cen­tra­tion of the prod­uct be­ing sprayed. There­fore, the amount of ac­tive in­gre­di­ent ap­plied to a horse will be the same re­gard­less of whether his coat is wet or dry dur­ing ap­pli­ca­tion. Once his coat has dried, the same amount of the ac­tive in­gre­di­ent is spread over the area sprayed. A wet or dry coat will have no im­pact on the safety pro­file of the prod­uct when ap­plied ac­cord­ing to la­bel direc­tions.

To af­fect the ef­fi­cacy of a prod­uct, di­lu­tion would need to oc­cur dur­ing the mix­ing of the so­lu­tion be­fore it is ap­plied. The amount of ac­tive in­gre­di­ent per area is ul­ti­mately what de­ter­mines ef­fi­cacy. Once you are ap­ply­ing the prod­uct to the horse us­ing the sprayer, the amount of ac­tive in­gre­di­ent per unit area will not change even if a horse’s coat is wet. The only po­ten­tial for re

duced ef­fi­cacy is if the animal is drip­ping wet and prod­uct is car­ried off with the ex­cess wa­ter. Brice Besser Chem­istry Di­rec­tor, MGK Min­neapo­lis, Min­nesota

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