The use of systemic pesticides to save Pinons seems to be pretty widespread in this area.  I refuse to put beehives on a property by museum hill due to the 30 foot columns of pesticides in 2016 and 2017.  Now the pesticides are being injected into trees.  

Where I live the community uses water to spray the larvae/pupa off the tree, gather the webbing into a trash bag and dispose of.

Good luck, I haven't done any research searches since 2017 on bees and pesticides.  You might contact Beyond Pesticides and The Center for Honeybee research in Asheville NC.  

When Bayer moved into North Carolina the master beeks that hired on and did research for them, only conducted trials for 6 weeks, however long a neonicitinoid stays sub-lethal in a bees system/hive never longer.

Annallys

From: hive <hive-bounces@lists.sdcbeeks.org> on behalf of jason schaefer <js@jasonschaefer.com>
Sent: Tuesday, April 28, 2020 10:12 PM
To: hive@sdcbeeks.org <hive@sdcbeeks.org>
Subject: [SDCBeeks] Tree & shrub systemic pesticide and bees
 
Hi everyone

Hope you all are doing well!

I am writing to ask if anyone knows of any scientific resources
regarding the systemic pesticide use on pines and the impact on bees.

My neighborhood has a bad pine scale problem and some neighbors are
getting desperate and using systemic pesticide. I would like to give
them as many resources as possible before making that decision..

Personally, I have been disrupting the larval stage each year and
watering a little extra with great success against the scale. (I can go
into more detail if anyone is interested in my battle with scale, I'm
sure you have the problem too ;-)

Jason



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