Bay laurel tree diseases
The bay laurel is also subject to powdery mildew, a gray or white coating on the leaves caused by fungus. It will appear as circles and then grow to cover the leaves. The white circles produce spores of fungus that are transferred to other parts of the tree and other plants by wind and insects. The leaves may wither and fall off the tree. Since they respond hearty to pruning, bay laurel trees are very used in topiaries, and they are typically disease resistant. On the contrary there are a sporadic diseases that can harm your bay laurel tree.
Bay sucker
The Bay laurel is subject toTrioza alacris, or bay sucker, which is caused by plant lice that jump from plant to plant. Bay suckers feed on the sap and rob the tree of its nutrition, causing the leaves to curl and turn yellow, then turn brown and fall off. Although the tree is weakened from this disease, early treatment can prevent it from dying. Treat the tree by removing visible lice, then spray a mild pesticide onto all parts of the leaves and stems. Dig into the dirt slightly, but do not expose the roots, and spray into the dirt.
Bay anthracnose
Dark lesions appearing on the leaves and branches of bay trees can be indicators of anthracnose, a disease which is caused by fungus. The tan, black or brown spots may appear tar-like. Although anthracnose will kill trees, mature trees are somewhat resistant. Avoid placing too many plants close to your bay laurel; be sure that air can circulate through any plants. Anthracnose must be treated in winter, when you must prune all infected branches, and leaves must be removed and destroyed. Do not use these leaves in mulch or you will spread the fungus to other plants and trees. Apply a fungicide after pruning and again in the spring. Watch the environmental factors, especially irrigation during wet springs, to ensure that the moisture is pulled down away from the tree and does not stay in the soil near the crown. Prune the canopy of the tree during the winter to improve air flow as a preventative measure.
Powdery mildew
Bay laurel trees are pyramid-shaped evergreen trees with shiny grey bark that are commonly grown in containers, although they can further be planted and grown outdoors, expressly in warmer climates. Bay credit are native to the Mediterranean region, and cannot withstand temperatures below 19 degrees Fahrenheit (-7 degrees Celsius) or USDA hardiness zones 8 to10. Bay bays can distance 60 feet however typically extent between 3 and 10 feet in containers. The trees are normally used in woody gardens, for windbreaks, and hedges. Remove all infected leaves and branches and destroy them. Do not use diseased plants in mulch. Apply a fungicide to the tree and any other trees in the area. Ensure that you have the proper growing, watering and fertilizing practices to avoid another infestation.
