They flower one or two weeks later than most other.

Apr 18, Magnolia Tree Diseases. The stately and ancient magnolia is a tree beloved by people everywhere, not just those native to the southern United States.

Strategy 2: Summer and Dormant Oils - Horticultural oils often called summer oils at 1.

Magnolias are so tough that many tree owners will never notice any real problems throughout their tree’s life, but when a sick magnolia tree is identified, the causal agent may be serious. Magnolia may be subject to leaf spots caused by the bacterium Pseudomonas syringae or a large number of fungi. Leaf spots rarely require chemical controls. Rake up and dispose of infected leaves. Canker diseases will kill branches. Cankers on branches can be pruned out. Keep trees healthy with regular fertilization and by watering in dry weather.

Also known as the bull bay tree, the Southern magnolia is the most notable evergreen magnolia native to the U.S., a dramatic landscape tree. The Southern magnolia can get quite large to 80 feet tall and 30 to 50 feet wide--and needs lots of space.

It requires acidic, moist soils, but can tolerate drier conditions if its roots have room to. Some trees are nice. Others are monsters. Here are six monsters you should never, ever plant in a residential neighborhood, lest you earn your neighbor's hatred and Grumpy's scorn.

Terrible Tree #1 -- Mimosa (Albizia julibrissin) What's wrong with it: Weedy, short-lived, insect- and disease-prone, invasive roots, unattractive most of the year. Star Magnolia is a slow growing, broad spreading, small tree or large shrub, ultimately reaching 15 feet tall or more.

Magnolia trees require little care and are resistant to many diseases and pests.

Leaves may be inches long and up to 3 inches wide. As a deciduous plant, the dark green leaves drop in fall, sometimes turning yellow before falling.