> Does anyone have particulars on Zerotol or H2O2 as a fungicide especially
> in combatting apple scab. Further does anyone know how H2O2 works as a
> fungicide - whether it has residual activity, does it act merely as a
> contact fungicide, etc.?
> Gord Hawkes
> Log Cabin Orchard
> Osgoode, Ontario
I don't see how H2O2 can act residually as it breaks down quickly in sunlight.
I think it is more likely a contact fungicide. But using a hydrogen peroxide
solution in conjunction with apple scab forcasting programs could provide good
protection. Of course, daily sprayings will likely be required for the
infective period. (Also, sprayings at dusk may reduce photodegradation.) Just
my $0.02. (Standard disclaimer about my status as a plant pathology student
still applies. . .for a while at least.)
Hope this helps,
-- The soil population is so complex that it manifestly cannot be dealt with as a whole with any detail by any one person, and at the same time it plays so important a part in the soil economy that it must be studied. --Sir E. John Russell The Micro-organisms of the Soil, 1923
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