Back in July I treated a number of black and red pines for suspected root aphids (see “Why are my trees yellow“). I’ve noticed a few changes since then and wanted to share what I’ve seen. Some yellow growth has turned green The healthiest trees are sending out summer shoots The weakest trees remain unchanged […]
root aphids
Why are my trees yellow?
I was puzzled, this year, by the appearance of yellow foliage on some of my young pines. Yellow foliage is common on weak trees and often results from bad soil, under-feeding or various kinds of infestation. All of my pines are in the same soil, get the same sunlight and fertilizer and show no signs of infestation. […]
Stealthy pests – root aphid and adelgid
With some pests, no matter how closely one looks at the foliage, no signs of active infestation come to light. Slide the same tree out of its pot and it’s another story. Root adelgid on young black pine roots Root aphids and adelgids are insects that feed primarily on their hosts’ roots. There exist numerous […]