Why I Oughta...

 I titled this post April/May because I'm posting it in May, but I took this photo in April of 2021.  April 24th, to be precise.  Those are the beautiful, exciting tree buds of one of our espaliered Greenspire Linden trees that are ready to burst open.  I posted a photo of these very same buds that were setting last Fall .  I planted these trees back in our first Summer here (2017) and set up the wire system that year, too .   I posted a similar photo EXACTLY one year ago today (May 4, 2020) with the buds showing a similar green and pink hue .   Last Summer - in year four of training (2017, 2018, 2019, 2020), I made the decision about the final form and pruned off a bunch of the limbs to leave just a four-tiered horizontal cordon espalier.   Also, last year this tree was infested with Yellow Jackets that were feasting on an aphid infestation .  Before all the leaves fell, I applied in two rounds some insecticide on the limbs in the hopes that I killed off any of the remaining aphi

A week or so ago, I posted about how our pair of espalier Greenspire Linden trees had come down with an infestation of aphids .  I asked the Master Gardener at the University of Illinois and they confirmed they were Linden Aphids and recommended a synthetic insecticide.  They also pointed me to this post from Colorado State University that lays out the two types . Persistent Contact Insecticide Sprays. And Systemic Insecticide Sprays. First the latter:  systemic.  These are ones that 'move through' the tree and can handle aphids that you can't reach with a topical/contact spray.  From CSU: A few types of insecticides have the ability to move into the plant and move systemically. Because of this mobility these systemic insecticides can provide better plant coverage and often provide better control of aphids than do non-systemic insecticides. Systemic insecticides are also able to kill aphids that are protected within a leaf they have curled. Timing of application is also