Plant (Tree) Health Care

Frequently asked Questions

Listed below are some questions we are asked regarding trees. If you have a question or comment click to e-mail us.

Question and Answer:

My crab trees lose their leaves by mid-summer, what can I do?

Crabapple trees in this area often become infected with apple scab fungus. Some species of crabapples are resistant to apple scab fungus and exhibit no symptoms, and others are dramatically affected by the fungus. Cool and wet weather is ideal for the fungus to thrive. It seems most springs in recent memory have been cold and rainy. There is no cure for apple scab fungus, but control is possible. Three fungicide sprays, beginning in very early spring, or a wedgel trunk injection of fungicide in fall or spring, allow for control of symptoms. Consistent annual treatment is necessary. Without treatment, crabapple trees become stressed and defoliate during the summer. Fertilization is also recommended to help trees resist disease and insect problems. Continually stressed trees are at higher risk of early demise if not protected by fertilization as well as adequate disease and insect control.

When is the best time of year to prune (trim) my Oak trees?

Pruning (trimming) during the dormant period will encourage growth, improve flower and fruit production, increase plant health, repair damage, and add to the overall aesthetic appeal of a tree. The risk of contracting the Oak Wilt fungi will be lessened when pruning during the dormant season. Oak Wilt is a devastating disease that attacks the vascular system of the tree, restricting the uptake of water and nutrients. Typically, it is not recommended to prune between the months of April and August, when oaks are susceptible to Oak Wilt.

What is mycorrhizae?

Mycorrhizae, which means "fungus root", works as an extension of the plant's roots to help the tree take up soil nutrients and water in exchange for a steady source of sugars. This co-dependant relationship has evolved over millions of years. However, in an urban setting, mycorrhizal fungi are not present in adequate quantities. This is especially true for soils that have been moved or compacted; soils that are low in organic matter; heavy clay soils; or soils with pronounced fertilizer and pH imbalances.

Mycorrhizal fungi are an essential part of all healthy plant growth and survival. Mycorrhizae improves assorbing root development, water, and nutrient absorption, and protects against soil borne pathogens. When used with a regular fertilizing program, trees receive a balanced diet which encourages growth, maintains health, and increases the overall vigor of the tree.

Why are my Austrian Pines "oozing " from the trunk?

Trees should always be inspected by a certified arborist to receive an accurate diagnosis, however, "oozing" is usually a response from the tree indicating a boring insect. The Zimmerman Pine Moth is an insect that can cause devastating damage to the pinus species. Infestations of this insect is the appearance of pitch masses (oozing) that dry and become light yellow to cream colored located on the trunk of the tree or at the base of a branch where it is attached to the trunk.

Timing is very important when treating Zimmerman Pine Moth. Two applications are needed to effectively control; one in mid-April and again in late mid August to early September.

Please call our Plant Health Care Department for more detailed information on any of the related topics (630) 562-0160.