As most of you are aware, Leyland Cypress is attacked by several fungal diseases. The worst of these diseases is Seiridium canker. Second in line of severity is Botryosphearia canker. These fungi cause cankering on the trunks and stems which eventually leads to the death of the tree. These diseases are much worse if the tree is in drought stress.
Though no chemical treatment is effective against these fungi, research indicates that if the trees are properly watered to eliminate drought stress, canker formation virtually ceases.
This is a prime example of how proper watering of your landscape not only maintains plant health, but is also directly related to disease suppression and prevention! Keep all your plants properly watered, especially your Leyland Cypress!
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