40120161 Staff asked 9 years ago
I have one Black Hamburg grapevine in a glasshouse. It is 30 years old. Grape crops were excellent up to 6 years ago when it was attacked by mealybugs brought in on an ornamental plant. How can I get rid of this pest chemically? I have tried control by cleaning off old bark, squashing egg-nests, etc., but the pest lives on despite these efforts.