Altacor Registered
on Apples
James F.
Walgenbach, Extension Entomologist, NCSU/Entomology
Altacor 35WDG (active
ingredient rynaxypyr) recently received
registration for use on apples, as well
as other pome and stone fruits and grapes.
Altacor is the first insecticide registered
in the anthranilic diamide class of chemistry,
which provides a new mode of action compared
to all other classes of insecticides.
It is an excellent fit in tree fruit
IPM programs in that it is a selective
insecticide with low toxicity to beneficial
arthropods. In addition to exhibiting
excellent activity against our key lepidopterous
apple pests (i.e., codling moth, oriental
fruit moth and tufted apple bud moth),
it also has long residual activity and
is safe to key mite predators. It is
labeled for use at 2.5 to 4.0 oz per
acre, but trials in NC have shown that
3.0 oz per acre provides excellent control
of all target pests. Altacor also provides
flexibility in application timing for
control of codling moth, because it is
toxic to both eggs (e.g., ovicidal activity)
and larvae. Hence, good results can be
expected when an initial application
is made anytime between the start of
egg laying to egg hatch.
With Altacor and Delegate (active ingredient
spinetoram) now registered for use on
apples, there are now two new and very
effective insecticides available for
control of codling moth. These registrations
come at an opportune time due to increased
problems with codling moth during the
last few years associated with populations
resistant to older insecticides. Properly
using these insecticides at the onset
is important to preserving their long-term
efficacy. As outlined in meetings this
winter, it is recommended that one of
these products be used against first
generation in May and June, and the other
against the second generation in July
and August. Within a season, do not expose
a single generation to both insecticides,
or use the same product against successive
generations. Considering the timing of
the Altacor registration and the fact
that initial insecticide applications
against the first generation are now
being made, for those growers choosing
to use these new chemistries, it will
probably be necessary to use Delegate
against the first and Altacor against
the second generation this year.
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