Vonsgardens

Depends on the systematic and the dosing. Many of the knock em dead systematics are hard on lots of trees. We use systematics on a regular basis on potted trees including Ulmus P., winged elms, slippery elms and american elms. We use about a 90 day cycle that will start in March. We use Disyston for the conifers- controls a vast number of spring borers, suckers and shoot tip moths and we are using Merit spray on the others. Merit does not require an applicators license in most states, has no holdover time and is quite effective for dealing with Japanese beetles and other root chewing grubs.

Talk to your Count Agricultural Extension agent in the US, other where, sorry don't know.

We haven't needed to use a systemic fungicide, we use lime sulphur, captan or copper based products topically as required.

John

__________________
"Wiring is simple; However, it is not easy to do it right" Boon