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ELM LEAF FIELD GUIDE
The common name no doubt reflects the fact that this species is a major pest of
of elm trees.
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ELM LEAF FIELD GUIDE
Elm leaf beetles are primarily a nuisance pest because they
enter structures in the autumn to overwinter.
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ELM LEAF FIELD GUIDE
Outside, the _ from both the adults and larvae can spot car finishes, especially on hot summer days.
fecal material
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ELM LEAF FIELD GUIDE
Both larvae and adults feed on the
leaves of elm trees.
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ELM LEAF FIELD GUIDE
The larvae eat only the undersurface of the leaves, leaving the veins and upper surface which then dry, resulting in
leaf skeletons.
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ELM LEAF FIELD GUIDE
Leaves eventually turn _ as if scorched
by fire and drop off the tree.
Brown
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ELM LEAF FIELD GUIDE
Inside they are a nuisance pest, and will leave
stains if crushed.
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ELM LEAF FIELD GUIDE
No attempt should be made to kill these beetles in
wall voids at any time because dead insect bodies attract dermestid beetles (larder beetles, carpet beetles, etc.).
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ELM LEAF FIELD GUIDE
_ larvae wander and readily enter the living space, causing numerous complaints.
Dermestid
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ELM LEAF FIELD GUIDE
Instead, wait until summer when
all live overwintering adults are out of the wall voids.
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ELM LEAF FIELD GUIDE
Control begins
outside.
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ELM LEAF FIELD GUIDE
Reduction is achieved by spraying infested
trees with the application timed to kill the young 1st generation larvae and then again for those of each succeeding generation.
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ELM LEAF FIELD GUIDE
Also helpful in reducing populations is the treatment of the
bottom 3-4 ft (0.9-1.2 m) of the trunks of infested trees.
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ELM LEAF FIELD GUIDE
The application must be made just before the
larvae mature and begin their downward migration for pupation.
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ELM LEAF FIELD GUIDE
Best is to treat the trunks for each generation but treatment for the
last generation is key.
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ELM LEAF FIELD GUIDE
Unfortunately, on occasion some or all of the infested trees may not
be on your customer's property.
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ELM LEAF FIELD GUIDE
In this case, the neighbors should be educated about the
problem in an attempt to secure their cooperation.
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ELM LEAF FIELD GUIDE
Regardless, use of _ aimed at adults before they congregate and attempt to enter buildings is recommended.
preventative physical and chemical barriers
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ELM LEAF FIELD GUIDE
Physical barriers involve exclusion. Although total exclusion is probably not possible, all vents (roof, overhang, weepholes, etc.) should be screened with at least NUMBER mesh screening.
16-mesh screening.
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ELM LEAF FIELD GUIDE
around cable entrances, windows, doors, overhangs, facia boards, etc.
Use =
Caulk (silicone based is recommended)
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ELM LEAF FIELD GUIDE
These steps should be taken in June or July.
Installation of closable chimney caps may be advisable.
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ELM LEAF FIELD GUIDE
Preventative chemical barriers involve applying a
highly repellent, long-lasting residual to all outside vertical walls and the adjacent overhang;
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ELM LEAF FIELD GUIDE
formulations work best.
microencapsulated pyrethroids or pyrethrins, or pyrethroid wettable powder
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ELM LEAF FIELD GUIDE
This application is made _; if in doubt, check with your cooperative extension agent.
just before the last generation of adults emerge
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ELM LEAF FIELD GUIDE
If adults have already begun to congregate and attempt entry into buildings, it may be
too late for preventative action.
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ELM LEAF FIELD GUIDE
The best solution is physical removal
with a good shop-type vacuum.
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