Recommended Larch Casebearer Treatment in Greenhouses

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akelsey
Posts: 3
Joined: Sat Mar 19, 2016 11:41 am

Recommended Larch Casebearer Treatment in Greenhouses

Postby akelsey » Wed Apr 13, 2016 11:17 am

Larch casebearer larvae recently emerged on western larch scion material used for this year's grafting in our greenhouse. This is the first time we've grafted western larch and I've been scrambling to find out how best to treat for larch casebearers. Several professionals I've contacted have dealt with casebearers in an orchard setting, but I have not been able to find anyone with experience in greenhouse treatment.

Our main treatment to date has involved hand-removing the larvae, which is time-intensive but appears to be fairly successful (still too early to make a definitive conclusion however). I'm interested in hearing from anyone else who has had experience with other treatments for casebearer larvae in greenhouses or nurseries.

FabienneColas
Posts: 1
Joined: Fri Feb 26, 2016 12:57 pm

Re: Recommended Larch Casebearer Treatment in Greenhouses

Postby FabienneColas » Wed Apr 13, 2016 1:05 pm

In a nursery I work with, they still had a problem with this casebearer in a greenhouse. It is quite difficult to eliminate due to the case. If your "invasion" is not too important, manually is good. You can use chemical products such malathion or carbaryl (Sevin XLR), see the tag for the suggested dose.

akelsey
Posts: 3
Joined: Sat Mar 19, 2016 11:41 am

Re: Recommended Larch Casebearer Treatment in Greenhouses

Postby akelsey » Wed Apr 13, 2016 4:24 pm

Thank you for the feedback, especially the pesticides that you've tried. I am currently working with my supervisor and our forest entomologist to explore which options we as an agency can use. One good thing about our situation is that we do not have larch trees in the greenhouse every year or in our orchards, so the casebearers will not get established here long-term. I do hope to make recommendations to the partner organization receiving the trees. My understanding, based on recent conversations with people who've grown western larch in orchards, is that casebearer has not been a significant problem once the trees are established in the field. If anyone has information related to casebearers in orchards, I'd be interested in hearing about your experiences.

akelsey
Posts: 3
Joined: Sat Mar 19, 2016 11:41 am

Successful Larch Casebearer Treatment

Postby akelsey » Thu Apr 21, 2016 1:42 pm

We conducted two systematic hand-removals of the larch casebearers and it appears to have been effective. We have not found any additional live casebearers on our grafted seedlings. This is a time- and energy-intensive effort, but is environmentally friendly!

We will continue to monitor the larch seedlings to catch possible late emerging individuals or casebearers we previously missed.


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