White cottony stuff on old wounds

[treemann]

Does anyone know what this is it was on several old wounds on this crab apple

 

[treemann]

2nd picture

 

[treemann]

3rd picture

 

[woodville]

Woolly aphid.

 

[kage]

aphid or an adelgid.. does it move around or are it/they concentrated in one area?

 

[Morice]

I agree with Kage, that's also why there's sooty mold ( the black stuff) on the limbs.

 

[pancake]

How was Roswell New Mexico Morice? Is crabapple a species that Wolly Alelgid feed on? More info please, size, do they fly, symptoms on the tree, where are they congregated the most?

 

[kage]

sorry i missed the fact that it was a crabapple, in that case it would be a type of wolly aphid, not an adelgid, which are more associated with conifers.

pancake here's a link i found which answers some of your questions http://www.extension.umn.edu/yardandgarden/ygbriefs/e453woollyaphid.html

 

[pancake]

I spoke to soon as well. It looks like Erisoma lanigerum (Haufmann) aka the wolly apple aphid ,primary host Ulmus americana then the adult colony moves to apple in this case to feed. Imidacloprid or Safari, either systemic should work on this sucking insects. Bt will be inneffective regardless of which species is employed, there are other controls if the timing is right.

 

[treegazer]

If there are only a few wooly apple aphids on the tree you can use a strong jet of water to remove them. Check back in a few days and and hose off any remaining. No need to use chemicals on a few insects if you don't have to.

 

[pancake]

Point taken, some don't see the necesity for chemicals and I have no problem with that. Soaps and oils are somewhat effective dependant on the application, pest numbers and vulnerability, and life cycle of the insect. My current take is responsible use of pesticides by qualified applicators who truly care about environmental issues can safely and effectively administer (synthetic) pesticides with little or no harm. I have 2 young children and 80% of the rural population of my state get their H2O from the ground, I feel safe following or surpassing the guidlines using pesticides. Sometimes targeted applications or synthetic pesticides work better, on other occasions they aren't warranted. There is much to be said about a solid IPM program.