Hortiscope: Managing grapevines both art and science

Q: I have severe pine needle scale on my spruce trees. Today, I noticed the males were in flight, so I’m guessing this is the second generation for the season. Is it too late for a systemic drench application? What product is the most potent systemic to use? There seems to be several brand names with different active ingredients. I have access to professional-grade chemicals.

By: Don Kinzler, INFORUM