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More on Hosta Chewing Insects

  • Subject: More on Hosta Chewing Insects
  • From: "Mortko, Robert A. (Rob)" <MortkoRA@bv.com>
  • Date: Tue, 18 Jun 2002 10:09:15 -0500

Good morning all,

A related question...

The visible damage caused by either slugs and cutworms (or caterpillars in
general) is fairly distinctive and easy to identify. However I have been
getting some questions on other insects that might cause similar damage on
hostas. One person claims to have religiously applied slug bait since early
spring and is still getting small holes in their hosta leaves. There is
speculation that some types of beetles might also chew on hostas leaves
leaving small holes.  Can anyone speculate on this? If so I assume a broad
coverage insecticide like Sevin would take care of the problem?

Rob in KC

> -----Original Message-----
> From:	W. George Schmid [SMTP:hostahill@Bellsouth.net]
> Sent:	Monday, June 17, 2002 10:54 AM
> To:	hosta-open@hort.net
> Subject:	Re: cutworms on hostas?
> Hi Lu-Dan,
> I tried nematodes to no avail. The only thing (unfortunately) that seems
> to work is to apply nasty systemic insecticides when the first notches are
> noticed. Here the damage is on epimedium (fresh young leaves), H.
> 'Honeybells'  and H. plantaginea, and anything with a bright green spring
> color, like the young leaves of the redbud tree (Cercis canadensis). They
> seem to leave dark green alone. I only spot treat because the nonsocial,
> solitary leaf cutter bees are realy good bees. The damage occurs only
> during a certain period in early spring, here in late April and into
> mid-May, when the bees are lining their new nests with the leaf cutouts.
> Apparently, the systemic gets carried into the nests and works there. More
> in my book page 374.
> W. George
> 	----- Original Message ----- 
> 	From: Dan & Lu <mailto:hostanut@Bellsouth.net> 
> 	To: hosta-open@hort.net <mailto:hosta-open@hort.net> 
> 	Sent: Monday, June 17, 2002 10:09 AM
> 	Subject: Re: cutworms on hostas?
> 	Hello Dr. Grewal,
> 	Do these nematodes work on carpenter bees also? Would the adult bee
> take the nematodes into the wood and infect the bee larva also? I have
> carpenter bees rather badly here in Georgia.
> 	Dan & Lu

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