Systemics applied to trees/shrubs regardless of the mode of application need to be done with caution. Linden come to mind. A fall soil application of imidacloprid will be in full concentration in the tree the next summer when the tree is in flower.What about soil applied insecticides. This still an issue with pollinators?
I laugh with TreeJunkie. I don't get why everyone says 'inoculate' for DED when they mean 'treat' for DED... I hear this all the time. I think it's a fancy term people use to "sound professional" although for anyone in-the-know, it does the opposite... No offense nuthin_special, we ALL make mistakes.We've started using DutchTrig as a DED innoculant. All natural, quick and easy application.
From what I understand Elms are able to fight off Verticillium. Being a vascular disease whatever they do works to "vaccinate" them from DED.But Dutch Trig is an inoculation of a substance that causes a reaction in the tree that allows the tree to fight a subsequent infection. The word inoculate is actually correct in this case, although you are not inoculating for DED but rather to prevent it, and certainly not to treat it.
Dutch TRIG is a "vaccine"; from the website:
Dutch Trig® is a non-chemical, non-toxic, biological control agent, or vaccine. The vaccine consists of a suspension of spores of a very specific strain of the fungus Verticillium, (not genetically modified), in distilled water. This spore suspension is injected in the elm in spring.
This is certainly up for debate and I agree with the thesis of it may be worse for the environment to let hemlocks die.....but why aren't things like hort oil considered? We can save hemlocks and many other trees without Merit. I really can't think of a problem that Merit treats that can't be treated another way.Another question I have is how much of the possible colony collapse of bees could be attribited to arboriculture, especially when only treating non flowering large trees applied as a soil drench or kioritz very close to the trunk VS the use of these chemicals broadcasted over a farm field, over thousands of lawns and used as foliar sprays on flowering plants?
We use hort oil and BT lots. Not sure what some of the others are, maybe use the active ingredient instead of the trade name.
I find that there are tons of pests that we don't need to treat for. maybe i'm losing money by showing up to a house and telling the HO that the damage is inconsequential and doesn't need treatment. Probably tossing away an easy $100 but i think that pesticides should be a last resort in all cases.
That said: look into TreeAzin (a neem oil product). There's no way that Merit (or any imidacloprid formulation) is low toxicity.
Bugs have to eat too right? They don't all have to be killed.
Looks like safari is far from low toxicity with a such a broad spectrum of control and a soil half life of 22-68 days.
There are really only a few pests that you listed that actually kill trees.
Borer and miners need to be treated systemically. Unless you time the crawler phase perfectly hard scale often need systemics as well.This is certainly up for debate and I agree with the thesis of it may be worse for the environment to let hemlocks die.....but why aren't things like hort oil considered? We can save hemlocks and many other trees without Merit. I really can't think of a problem that Merit treats that can't be treated another way.
Also, it's worth mentioning that Agri-Fos is not actually phosphorous (which IS a major leaching nutrient). It's actually a form of potassium that works to naturally improve plant health. I think it's one of the better low toxicity tools for PHC.
Are you using the 2 oz. per 100 rate with the Acelepryn or does it need to be higher for Jap Beetle? I was quoted $965 for 64 oz. of Acelpryn, just over $30 per 100 cost I guess that's not so bad.Update: Acelepryn and Azatin working great for Japanese beetles when applied before major adult emergence. Not as effective when extensive feeding has already occured.
Azatin and Conserve SC worked no better than Azatin alone and significantly less effective than Acelepryn with Azatin as far as I could tell. Perhaps a stronger rate would work better.
Gotcha, my local ag station tested it this year at 2 oz. Per 100 for gypsy moth caterpillars and got good control. Might be my go to next year. It would be nice to have a bee safe product for jap beetles.6oz and up per hundred but I'm doing high end residential, some places I have carte blanche to do whatever I feel needs to be done and how.