Dygall - Crown Gall Treatment

What is crown gall?

crown gall on roots

Crown gall is a bacterial disease of world-wide importance on many woody plants.  It can be especially serious in nurseries growing susceptible ornamental plants and deciduous fruit trees.

Crown gall is caused by the bacterium Agrobacterium tumefaciens and is a disease which causes hard woody galls on plant roots and stems.  The galls have a rough convoluted surface.  They vary in size, often growing many times larger than the diameter of the roots or stems.  Some galls reach over 60 cm in diameter on old trees.

Crown gall is mainly considered a nursery problem.  Open ground nursery plants need to be lifted exposing the galls whereas the roots of orchard trees are not usually examined after planting.

gall on stem

Gall formation can disrupt the plant’s food and water conducting tissue causing infected young plants to become stunned and grow poorly.  On older trees the galls can also serve as entry points for secondary wood rots which weaken the trees.

The biological answer

When Dygall® directions on the label are followed, this material should provide a safe, natural and inexpensive but efficient, method of preventing a troublesome disease on many susceptible plants by simply immersing plants in a suspension of Dygall® and nature takes its course. It is important to remember that Dygall® is a preventative for crown gall and should be applied to susceptible plants before exposure to the disease or final field placements as it will not control existing infections.


Soil treatment with steam or methyl bromide-chloropicrin mixture can be effective but only if all the crown gall bacteria are destroyed. A small residue of these pathogenic organisms can multiply rapidly and expensive soil treatment does not always provide the degree of control required. However, it is now possible for nurserymen and horticulturists to control crown gall by simply inoculating seedlings, cuttings, peach stones etc., with Dygall® prior to planting.

Dygall® is produced under stringent quality control procedures and supplied in 106g packs each containing approximately 5000 million viable bacteria per gram.  Unopened packs can be cool stored if required until the expiry date shown. Dygall® is highly effective – one pack is sufficient to inoculate up to 7500 rose cuttings, 2500-7500 rooted cuttings of plum, euonymus, raspberry, etc., (depending on size of root systems) and up to 10,000 peach seeds.

dygall products

Our customers love Dygall

2019 & 2020 Orders

Most trees available for 2019 are sold out, please contact your sales representative to view which varieties might be available. Check out our availability of varieties and rootstock to order from. Ask your sales representative about custom budding of varieties not listed.

After your order is placed, we have to source the right amount of rootstocks and begin the growing process for your order. Understanding the order process

John Bakker, St.Catharines, ON.

“At J.C. Bakker and Sons we have been successfully using Dygall® for many years. We are one of Canada’s largest producers of roses.  Applying Dygall® to our rose seedlings prior to planting has greatly reduced occurrences of crown gall in our production. I highly recommend this product for use on susceptible host plants.”

Bob Osborne, Corn Hill, NB.

“At Corn Hill Nursery Ltd we were having an increased incidence of crown gall in our crops. We decided to try Dygall® as a dip before planting.  The crops treated with Dygall® were virtually free of crown gall. We now use Dygall as a regular part of our planting procedure and would not consider planting without it.”

Dave Adamson, Langley, BC.

“At Adamson’s Heritage Nursery Ltd we were having an increased incidence of crown gall in our rose and deciduous liner material. We decided to try Dygall® as a dip before sticking cuttings.  The crops treated with Dygall® were virtually free of crown gall. Since 2011 we have been dipping all of our cuttings in Dygall® prior to planting.”

Marianne Baril, St. Julien, QC

“At Pépinière Ancestrale, we are aware of the risk of contamination of certain bacteria that may have serious consequences on fruit trees and shrubs that we produce. For biocontrol we use Dygall® to prevent gall and avoid the spread of this bacterium on our fruit and our soil. Dygall® has proven to be additional insurance for our customers!”

John and Linda Suk, Fenwick, ON

“At South Pelham Nursery we continue to use Dygal® prior to planting any of our prunus and pyrus varieties.  These varieties treated with Dygall® before planting are virtually free of crown gall.  We  recommend this product for use on these varieties.”

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