The trunk of my lemon tree seems to have s crack in it and sap is oozing out from this crack. As well it seems that 1/2 the leaves are missing from the tree, leaving branches exposed with nothing on it. Fruit is still plentiful and healthy, but the overall look of the tree isn't the brightest or happiest some could say. It seems that it might have a disease, but I just don't know. Just wondering your opinion on this matter and treatments that I can do to say my 15 year old Lemon Tree
24 September 2014 11:02 PM
Judging by the symptoms you have described, the trunk of your lemon tree appears to have collar rot, which is caused by a soil inhabiting fungus which can only attack the tree under certain conditions. If the foliage is yellowing and the tree generally looks unhealthy, collar rot may be the cause. The first symptom is usually seen near ground level where some gum may ooze out from the bark. Later the bark may appear wet in a patch near this gum, and later still it may dry out and become brittle and split. If this disease is not controlled and if the conditions for the tree are not improved, the rot will spread right around the trunk and ringbark the tree. The fungus grows well in damp conditions and thrives where weeds have been allowed to grow near the trunk or where vegetables or other small plants have been cultivated near the trunk. It would also be favoured by overwatering. Improve air circulation near the trunk so that humidity is decreased, avoid watering the trunk, don't grow other plants too close to the trunk, prune off lower branches and improve soil drainage. Should the disease occur, the damaged area must be repaired. Damaged bark should be cut away with a sharp, sterilised knife, and the wood beneath smoothed." Try Anti Rot, it is a systemic fungicide which is absorbed by the foliage and travels down to the roots, can be used on various plants to control phytophthora root rot, crown rot and collar rot.