General Information


FATHOM 14.3 MEC also controls numerous diseases on ornamentals and other landscape and nursery plantings such as powdery mildews, rusts, leafspots, scabs, and blights. Refer to the appropriate section of the label for specified diseases and plants.

Do not apply this product through any type of irrigation system. Do not use FATHOM 14.3 MEC in greenhouses.


Do not apply this product in a way that will contact workers or other persons, either directly or through drift. Only protected handlers may be in the area during application. For any requirements specific to your State or Tribe, consult the agency responsible for pesticide regulation.

Note: Do not apply more than 5.4 gals. of FATHOM 14.3 MEC per acre per calendar year.

Failure to follow the directions for use and precautions on the label may result in plant injury or poor disease control.

Limitations, Restrictions, and Exceptions


General Information

It is recommended that FATHOM 14.3 MEC be administered by trained arborists or others trained in injection techniques and in the identification of tree diseases.

Notes: The active ingredient in FATHOM 14.3 MEC has been shown to be safe on a wide range of plant species. Before using FATHOM 14.3 MEC on plants or for diseases that are not listed in the Directions for Use, test FATHOM 14.3 MEC on a small-scale basis and evaluate for phytotoxicity and disease control prior to widespread use.

Correct Location for Injector Placement

The flare root area is the transitional zone between the trunk and the root system. Uptake and distribution of FATHOM 14.3 MEC is more effective when injections are made into the flare roots. In addition, wounds created in the flare root area close more rapidly in comparison to wounds above the flare root area.

Tree Measurement

Measure the diameter of the tree using a tree diameter-tape (D-tape) at 4-1/2 feet above the ground. This is the diameter at breast height (DBH). If only a regular tape is available, measure the tree circumference and divide that number by 3.14.

For crabapples, measure the diameter at the point where the tree begins to branch.

See label for Preparation of Injection Solution.


For pressurized injections, with the outlet valve open, connect the tank to the inlet valve and begin pumping solution until all air bubbles come out of the outlet valve. Direct the solution into a container and return the solution to the tank. Shut off the outlet valve. Pressurize tank to 20 – 30 psi. Check for leaks and gently tap in tees if necessary. Maintain continuous pressure on the injection system until the full amount of solution is in the tree.

After injection is complete, remove injection tees and leave drill holes unplugged. A water flush to cleanse the hole will assist with wound closure. Soil should be replaced around the tree. It is not necessary to treat the drill holes with wound paint or other sealing compounds.

Contact your local extension agent for more details on tree injection. The injection system described is meant as an example; please refer to manufacturer’s instructions when using other types of tree injection systems.


At the initial injection of FATHOM 14.3 MEC, take notes on the level of disease in each tree. Reevaluate disease level in trees at 12-month intervals after treatment for the potential need for retreatment with FATHOM 14.3 MEC. Preventive applications should be considered 12– 36 months after the initial injection. Trees in high disease risk areas or high value trees should be evaluated for possible retreatment 12 months after each treatment.


Preventive and Therapeutic Treatment

Use 6 –10 ml of FATHOM 14.3 MEC in up to 1 liter of water per inch DBH. For very high disease pressure, 20 ml of FATHOM 14.3 MEC per inch DBH may be used.

Notes: (1) Accurate diagnosis of Dutch elm disease is important since FATHOM 14.3 MEC only provides control of Dutch elm disease in elms. (2) FATHOM 14.3 MEC will be most effective when used in conjunction with other cultural practices recommended for management of Dutch elm disease (removal of dead elm trees, pruning of diseased tree limbs and branches, control of bark beetles, etc.). (3) Preventive applications can be made at 6 –10 ml/inch DBH. The 6 ml rate should provide 24 months’ control and the 10 ml rate should provide 36 months’ control. (4) Therapeutic treatment in trees showing disease symptoms should be made at 10– 20 ml/inch DBH. Retreatment may be needed every 12– 36 months. Trees in advanced stages of disease development may not respond to treatment.

For further information on the proper diagnosis and control of Dutch elm disease, consult your local extension agent.

Refer to the General Information section for details on retreatment.

Restricted Entry Interval

24 hours