Xtremehorticulture

Sap Oozing from Apricot May or May Not Be Borers

Q. Can you tell me what happened to the apricot tree? A. Boy that does not look good. The first assumption people make is borers. This can be true but there are other things that can cause sap to ooze for limbs and the trunk. Stress is one of them particularly in plum. Another is overwatering or rotting of the trunk. So the first thing I would do is pull that mulch away from the trunk and inspect it. Sap oozing from limb You may have to take a sharp, sterilized knife and cut into the area just an inch below the level of the mulch or soil directly below the sappy area. The wood should be cream colored. The cut does not have to be big, just a knick is enough. Just enough to see the color of the wood or actually just below the bark, the cambium layer. If the wood has good color then remove a couple of globs of sap and cut the same way just below the sap. This will be a bigger cut, enough to see the wood. Look for any signs of sawdust or sappy sawdust just under the sap. If you see traces of tunneling just below the bark and in this cambium layer then you can conclude it is borer damage. During winter, cut into the limb and reveal the borer, removing all loose bark or remove the limb if it is bad enough. Lastly watering too often, keeping the soil moist without letting it dry out can also cause sap to bubble to the surface which is really due to stress again most likely. Pull the mulch away and let it dry out if you think that might be the problem. If borers are the problem, dig them out with a sterile knife and let the tree heal afterwards.

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Sap From Apricot Trunk MIght Not Be Borers

Orange sap oozing from readers apricot trunk Q. Our apricot tree has orange sap oozing out of the trunk in several places (see pictures attached).  The tree appears to be healthy and produce a good crop of tasty apricots this past season.  In some places, the sap appears to be coming out of the crevasses in the trunk bark.  In other areas, it appears to be coming out of holes in the bark (borers?).  What can I do to save this tree?  Is there an insecticide or fungicide that I can use?  For the areas where the sap is coming out of the crevasses, should I scrape the sap off and paint the tree again?  For the couple of areas where it appears that the sap is coming out of holes in the bark, can I insert a thin strong wire to kill the borer?  Any suggestions would be appreciated. A. This is a little bit more unusual in apricot than it is in peach or nectarine. It is most likely in this case a boring insect, the same type that attacks many of our other fruit trees and landscape trees and in particular peach and nectarine the hardest. Readers apricot tree in very good condition except for the orange sap from the trunk. Of all the places for sap to emerge this is probably the worst. If the damage to the majority of the trunk you could lose the tree. If this were me I would take a sharpened and sterilized knife (alcohol is good enough or heat) and cut under the sap and examine the wood directly under it. If the wood appears healthy (you see some green or it appears fresh and wet) I would stop and not do any more. If it is not fresh and damp with a healthy appearance but instead dead, then I would cut these bubbles of sap from the tree trunk and remove all dead areas until you find fresh wood again. Make the border of this dead area as smooth as you can so it heals as quickly as possible. If the dead area of the trunk (if it is there) extends more than half way around the trunk the tree is in big trouble. Hopefully the sap is coming from the trunk as a sign of stress and not extensive damage to the trunk. If you can find something to put between the tree trunk damage and the sun (I am assuming these sap bubbles are on the south, west or east side) and create a bit of shade on the trunk it would be good. Try not to put anything tight against the trunk so it does not trap heat on that spot. This is kind of unusual to see damage like this on apricot in that location. I am wondering of you have another problem going on. You have a basin around the tree and some mulch right up to the trunk. I also see you still have your support stakes on the tree. This is an older tree and these should have been removed a long time ago if there was nothing wrong with the tree. The tree looks very healthy and is vigorously growing. I would pull any mulch away from the trunk perhaps 12 inches if it is in fact touching the trunk. I would also make sure that you are watering so that even in summer you are not watering daily but there are several days between irrigations when the soil around the tree begins to dry. This kind of damage can also indicate the beginning of crown or root rot as well. So be very careful of your watering.

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