Lecanium Scale

[macrocarpa]

Is anyone else dealing with the explosion of lecanium scale on crabapples?

What treatment methods are you using and timing of applications?

Evidently its an annual re-infestation here in Central Ohio these days.

I am so close to telling customers I don't treat junk trees. I have pruned a couple decent crabapples over the years, but in general I think they require way to much maintenance for a large sucker of a tree.

I'm assuming well timed oil sprays are the most eco friendly treatment method?

Has anyone used azasol as a soil drench for scale and would it be a less destructive alternative to the neonics?

 

[Basswood]

I do well with IGR applications mixed with a contact insecticide like oil or bifenthrin. I forget the ai of the igr I use but trade name is distance.

 

[ATH]

If the trees are reasonably small that you can get thorough coverage, hort oil in late June should do the trick.

 

[macrocarpa]

If the trees are reasonably small that you can get thorough coverage, hort oil in late June should do the trick.

Thanks for the timing recommendation! This seems like the best treatment option as it appears to be an annual thing now.

 

[JD3000]

Oil at crawler emergence and again 7-14 days later

 

[ATH]

FWIW, European Fruit Lecanium scale hatches at 767 GDD

GDD - Event View

www.oardc.ohio-state.edu

 

[ATH]

Also, I haven't seen any of these on crabapples up here.

 

[JD3000]

They'll get both fruit lecanium and calico, sometimes both at the same time

 

[macrocarpa]

Also, I haven't seen any of these on crabapples up here.

Also, I haven't seen any of these on crabapples up here.

Your lucky. Its nasty down here!

 

[Chemdave]

Watch your oil viscosity. I'd use a summer weight at this time