Eminectin benzoate rates

[Joster19]

I use the rainbow q connect and have primarily focused on high high value oak trees with tlcb. I also have an ash tree I will treat soon for a client. to this point they have had it treated with trunk applied (i assume dinotephron (sp?)) by another company. I have another client who had me cut down a 18-in. almost identically sized ash that had been treated for at least 5 years by the same company but it eventually succumbed to EAB.
two questions:
1. what percentage of canopy loss triggers you to switch from the medium 5 ml to medium high 10 mL?
2. do you use differing rates between species?
A friend of mine treated Ash that had visible galleries but not too much branch loss with 10 ml, wasn't certain if Ash generally need the higher rate.

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[Brando CalPankian]

I generally use the 10ml rate. Heavier infested 15-20.

 

[ATH]

We are currently using 5ml (it does depend which product you use though...)

However, when EAB was hitting hard and fast, the 10ml rate was more appropriate. EAB still shows up when trees go off of treatment, so its still 'necessary'. However, they aren't being killed in 2 years like they would have been 15 years ago around here. If you are on the "front edge" of the infestation, go higher. If you are getting out ahead of it or EAB has wiped through the area and you are keeping the survivors, 5ml. I'd probably stick to every other year, though the higher rate seems to provide reasonable control into the 3rd year. The clients who really want to go the extra mile to keep their trees get 5ml every other year and soil-applied imidacloprid every year (trees over 15" get 0.4 oz (2F formulation) on "off years" and 0.2 oz when the same year with Mectinite).

Oak and two-lined chestnut borer...that usually means there is something else wrong with the tree. Depending how bad it is, I might go 10ml to knock it back hard, but hopefully not plan to return. If I did, I'd go to 5ml after 3 years...but only if they client is also addressing overall tree health (decompaction and organic soil amendments? growth regulator? fertilization?)

 

[Brando CalPankian]

We are currently using 5ml (it does depend which product you use though...)

However, when EAB was hitting hard and fast, the 10ml rate was more appropriate. EAB still shows up when trees go off of treatment, so its still 'necessary'. However, they aren't being killed in 2 years like they would have been 15 years ago around here. If you are on the "front edge" of the infestation, go higher. If you are getting out ahead of it or EAB has wiped through the area and you are keeping the survivors, 5ml. I'd probably stick to every other year, though the higher rate seems to provide reasonable control into the 3rd year. The clients who really want to go the extra mile to keep their trees get 5ml every other year and soil-applied imidacloprid every year (trees over 15" get 0.4 oz (2F formulation) on "off years" and 0.2 oz when the same year with Mectinite).

Oak and two-lined chestnut borer...that usually means there is something else wrong with the tree. Depending how bad it is, I might go 10ml to knock it back hard, but hopefully not plan to return. If I did, I'd go to 5ml after 3 years...but only if they client is also addressing overall tree health (decompaction and organic soil amendments? growth regulator? fertilization?)

Spot on

 

[Bart_]

In our territory emimectin isn't allowed but you can sometimes slip in imidcloprid root drench for EAB. Is imidacloprid considered an equally viable alternative in your region?

 

[Basswood]

5mL upped to 10mL for trees over 35”. Dino has a super short residual so definitely get them off that program, not appropriate for EAB. I would only recommend the bark treatment if injections are on the late side for quicker protection until the EB moves up into the tree.

 

[ATH]

5mL upped to 10mL for trees over 35”. Dino has a super short residual so definitely get them off that program, not appropriate for EAB. I would only recommend the bark treatment if injections are on the late side for quicker protection until the EB moves up into the tree.

Yeah...we used Safari when EAB was first hitting and our first call from a new client came in late June or July ... wanted to get something in the tree ASAP, then switch to EB or imidacloprod with better planning. Dunitefuron is, by far, the most expensive option when you average costs given that EB lasts 2 years while dino lasts less than 1.