Tree Diseases & Pests in Ontario
Worried about pests or diseases affecting your trees? This section features articles written by certified Ontario arborists to help you understand the most common threats to tree health in our region—from fungal infections to invasive insects.
Here you’ll find expert advice on identifying early symptoms, spotting harmful patterns, and knowing when to take action. Whether you’re dealing with dying leaves, strange bark damage, or unknown pests, our articles give you the practical knowledge to protect your trees and your property.
We cover topics like verticillium wilt, beech bark disease, white pine blister rust, Dutch elm disease, oak wilt, and more. You’ll also learn about invasive species like the Asian longhorned beetle and how they impact local tree populations.
Each article is backed by real experience from the Sarginson’s team—ISA-certified arborists who diagnose, treat, and remove diseased trees across Toronto, Durham Region, Peterborough, and beyond.
Not sure what’s affecting your tree? These guides are a great place to start. If you need a second opinion, just Ask the Arborist or book an inspection.
Google Reviews
Clemer Wood
16:18 27 Feb 26
Sarginson's Tree service team did an outstanding job on taking my tree down safely and efficiently. The team also took some extra time to make sure that everything was raked and cleaned up!! I would recommend Sarginson's Tree service to anyone and everyone getting tree work done thanks again fellas!
Becca Dunlop
14:43 31 Jan 26
After getting into contact with a few companies Sarginson’s Tree Services was the most professional and understandable company. Others were rude and didn’t really seem to care about what I said. I will 100 percent be recommending Sarginson’s to anybody that needs these services. Professional, quick and kind. Great work guys, 10 out of 10!
Sertac Eliyurekli
21:26 29 Jan 26
We recently had a tree removed and were extremely impressed with the entire experience. The team was professional, efficient, and clearly knew what they were doing. The equipment they used was top-notch, and it was obvious they invest in the right tools to get the job done safely and properly. What really stood out was the cleanup 🥰 everything was left spotless, as if the tree had never been there. Highly recommend their services to anyone needing tree removal. 🌟🌟🌟🌟🌟
Janice Guilbault
20:10 18 Dec 25
The crew from Sarginsons Tree Services were top notch. Skilled at tree removal, we had 3, and excellent cleanup. Because of the snow, they ploughed the area where the trees were to be dropped which made for a thorough cleanup. The crew were polite and didn’t cut corners. Stacked wood where requested. The price was better than we’ve had with other companies. We will not hesitate to call Sarginsons again!
Tracy S
20:04 28 Nov 25
We used Sarginson’s tree service twice this year to address severe damage caused by the ice storm in April. We were so very impressed with this company! Both times the work was completed with care and expertise. The team was wonderful and everything looked fantastic when they were done. We found Chris, who provided the on-site quotes, to be very knowledgeable and provided fair pricing. We also appreciated that this company is excellent when it comes to difficult areas to reach and they come with all the equipment necessary to complete the work safely. The office staff are also well organized and a pleasure to deal with. We will definitely be using them again next year!
Feizel Suleman
16:07 23 Oct 25
Chris removed a 30 year old poplar from our backyard that grown to over 75 feet tall. Chris arrived early as scheduled on Oct 16 with a team of 6 people, and they worked incredibly hard to cut the tree down limb by limb. They were incredibly efficient, clean, and even my neighbour was super impressed with how well they did the job, and did not leave a single leaf on either of our backyards as they cleaned up. Would highly recommend Chris and his team for any tree work you need.
Carm Amoroso
22:46 20 Oct 25
We used Sarginson's to trim back our big English oak tree. They had the proper equipment and did a great job. They cleaned up the cuttings and were done in approximately one hour. They communicated with us at every step along the way. Chris and his crew were excellent to deal with.
We wouldn't hesitate to recommend this company for any tree work.
We wouldn't hesitate to recommend this company for any tree work.
Lincoln Greenidge
17:12 07 Oct 25
The team (all Chris's) did an amazing job on my tree at the back, the sides, and the hedges at the front. They were very professional, efficient, and amazingly clean and tidy in ensuring that the place looked great afterwards. GREAT and OUTSTANDING job!!!
Kim Stenner
18:33 06 Oct 25
Chris and his crew removed a 60+ year old Silver Maple and a dead Ash tree from our yard. They did a great job removing the trees and cleaning up the yard after removal. They work quickly, efficiently and safely. I would recommend them without hesitation.
Berlin D
13:07 04 Jul 25
Chris and his team did an exceptional job removing several large trees from our property. They arrived punctually with all the necessary equipment and took great care to protect our lawn by laying down protective tracks, allowing the heavy cherry picker truck to access the trees without causing damage. The crew was well-organized, with multiple team members efficiently cutting and clearing debris. They used 2 wood chippers to process branches and worked swiftly while maintaining a strong focus on safety.
What truly set them apart was their meticulous cleanup—when they were done, the area was spotless. Chris is highly knowledgeable about tree health and diseases, and he provided valuable guidance on which trees needed to be removed and which could be preserved. Beyond his professionalism, he was genuinely a pleasure to work with—just an all-around nice guy. I highly recommend his services without hesitation.
What truly set them apart was their meticulous cleanup—when they were done, the area was spotless. Chris is highly knowledgeable about tree health and diseases, and he provided valuable guidance on which trees needed to be removed and which could be preserved. Beyond his professionalism, he was genuinely a pleasure to work with—just an all-around nice guy. I highly recommend his services without hesitation.
Ramzi Henein
13:23 15 Jun 25
For anyone needing tree services, look no further than Sarginson's! They deliver on efficiency, capability, and professionalism, all while offering genuinely reasonable pricing. Their estimate was so fair, I had to ask if they were sure! Our 50-year-old Norway maple was safely removed in less than 90 minutes, with the stump gone just a couple of days later. Their quick and reliable service provides excellent value, and I'd absolutely use them again.
Barry Todd
16:12 16 May 25
We hired Sarginsons to take down our silver maple. They arrived at the time they said they would. Had a great organized crew that worked well together. They did a great clean up when they finished the job. I highly recommend them for your tree removal or pruning needs.
K
22:36 17 Apr 25
My husband and I contacted Sarginsons Tree Services to remove a large, unhealthy maple tree from our backyard. Chris and his team showed up on time and well prepared. The job was completed in a timely manner and the team cleaned up after themselves. I would highly recommend Chris and Sarginsons Tree Services, as they exceeded my expectations.
Dalton
22:17 17 Apr 25
Chris and his team did a phenomenal job removing an old, rotting tree from my backyard. Before starting the job, Chris came to the house to provide a quote and answer any questions. He is a very knowledgeable and friendly person. He explained the “how” and the “why” behind the problems with our tree and how he would remove the tree and stump. On the day of the job, Chris and his team showed up on time and took very little time to remove the tree. I was so impressed with how efficiently the team operated (this is reflected by their google reviews) and even more impressed with their clean up job. They literally left my property cleaner than it was before - truly impressive. I would highly recommend Chris and his team to anyone looking for any tree related services and I would not hesitate to use them again. They are extremely hardworking and nothing but professional. Thanks again!
Gary Wraith
21:32 17 Apr 25
The crew arrived on time and were courteous , friendly and very professional. The work was completed in a timely fashion and included a thorough cleanup of the property before leaving. Every effort was made to ensure the safety of the crew and to safeguard the surrounding gardens and buildings. I highly recommended this company.
Stanislav Necrasov
20:13 15 Apr 25
Sarginson's Tree Services removed an approximately 70 year old silver maple from my backyard today.
The 5 guys were professional, safe, organized, and had great customer service.
Would recommend Sarginson if you need to remove any tree in a very unusual situation.
Thank you, Sarginson!
The 5 guys were professional, safe, organized, and had great customer service.
Would recommend Sarginson if you need to remove any tree in a very unusual situation.
Thank you, Sarginson!
Christopher Coelho
13:45 12 Mar 25
Sarginson's tree services were very professional as they did some tree work and tree removals around my property. The boss was very polite and understood what my needs were to have my trees properly maintained, he even educated me on things I had no idea was wrong with some of my trees. Definitely would recommend Sarginson's tree services to any family or friends!
W H
20:58 07 Dec 23
Highly recommend Chris and his team from Sarginson’s Tree Removal Services from Courtice. Chris removed a large sugar maple tree from backyard in Oshawa that was very close to house and garage and extending over to neighbours. It took 8 hrs to remove the tree and cleanup. Chris is very skilled and knowledgeable. His quotes and options provided were very reasonable and all communication was excellent. He and team worked diligently, safely and were professional and polite. A bucket truck was used to reach part of tree but for most part Chris had to climb the tree to cut down each limb carefully and they used ropes to guide. They cut up wood (as requested) and even stacked for me. (I saved some $ by not having logs removed)They removed all smaller branches and debris and used a chipper. They swept and blew away shavings as part of cleanup.
I was very satisfied with the job and Chris. Would recommend for tree removal. (I didn’t get tree stump grinded as an extra cost, but may do later)
Wendy
I was very satisfied with the job and Chris. Would recommend for tree removal. (I didn’t get tree stump grinded as an extra cost, but may do later)
Wendy
Ryan Singh
01:15 06 Dec 23
They did an amazing job pruning my enormous Spruce tree. Also a great job on cleaning up all the branches.
Kay B
21:28 02 Dec 23
Great experience with this company. They did an excellent job removing a huge tree on my property that was over the house and at risk of falling. I was pleased with their time efficiency and customer service. Overall great experience!
Jimmy S
14:55 30 Nov 23
Chris and his team are super efficient and informative. He came out gave me a quote and then measured the trees to make sure that they were able to be removed. All trees passed and within no time he was back to complete the work with his team. We will be using his services again in the spring.
Crystal Fraser
14:52 30 Nov 23
What a dream it was working with Chris. He is so professional - prompt - and best of all his price was so fair! He went above and beyond at my house from start to finish and the job is perfect. Thank you to this amazing team for getting the job done quickly and with 0 hiccups. Have recommended them to family who have already got quotes and are having the work done this week! 10/10 would recommend.
Natalie King
11:00 08 Sep 23
We hired Chris and his team to take down our massive 55 year old willow tree and 2 other trees. They also pruned two others. They were here early and stayed late until everything was finished. They cleaned up the yard after and took all the wood with them! Very hard workers. They offered to leave some of the wood that is good for burning, which we weren't aware of. So now we have firewood as well! 10/10 will use them again and would recommend to anyone! Thanks guys for the amazing job. Here are some photos of during and after!
David Hoover
16:16 07 Sep 23
Chris and his team at Sarginson's Tree Service did an absolutely phenomenal job removing a large tree off my property. The tree was very close to the house, causing concern. However, they were able to remove the tree and all branches / debris without provoking any damage to the building or lawn. They were quick, professional and completely tidied everything up when they were done.
This crew went over and above my expectations. If you want a quality service, please hire Sarginson's Tree Service ! ! !
Many thanks ! ! !
I will be recommending your company to everyone I know ! ! !
This crew went over and above my expectations. If you want a quality service, please hire Sarginson's Tree Service ! ! !
Many thanks ! ! !
I will be recommending your company to everyone I know ! ! !
Nareshmoh
14:06 17 Aug 23
Recently Chris and his team remove a huge maple from our front yard (needed to go). It was about 80 feet tall and was within 8 feet of our house. I watched in amazement as they took the tree down and was totally impressed with both their bravery and professionalism. The clean up after was fantastic and he even cut a few large slices for me to use in the future for a woodworking project.
I would highly recommend them for tree care services
I would highly recommend them for tree care services
ISA Certified Arborist
Call: (905) 391-8454