April Showers, Bring May Diseases


Sugar maples in mid-bloom (J. Llewellyn)

Sugar maples are blooming all over southern Ontario, again! Did the hot, dry summer of 2016 have something to do with this?  The unusually warm February has accelerated plant development.  The (normally) distinct blooming time of several common ornamental plant phenology indicators are overlapping this year, making plant phenology models a little tricky to follow this spring.

Cool temperatures, cloud and rain has been pretty Continue reading

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Protect Malus Against Apple Scab


Fireblight (apple, pear, see above right) and Apple Scab (apple, see below) diseases are normally reproducing and spreading this time of year.  We have been more concerned about Apple Scab.  The cool weather has really reduced the activity of fireblight bacteria but the risk of fireblight will increase with temperatures >18C.


Continue to protect new growth for Apple Scab since Continue reading

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Warmer Temperatures Coming This Week

Lots of Plant Phenology indicators are blooming this week!  That puts us somewhere around 35 and 55 GDD’s Base 10C in the GTA.  A little more in the southwest and a little less above Hwy 9.


Acer rubrum ‘Morgan’ in full bloom (J. Llewellyn)

Plant Phenology indicators this week are overlapping because of the mild February. North of 401 and GTA include: Acer saccharinum (silver maple, finishing bloom); Acer rubrum (red maple, full bloom); Cornus mas (Cornelian cherry dogwood, mid to full bloom); Salix caprea (pussy willow, mid bloom); Acer saccharum (sugar maple, early -mid bloom, some may not bloom); Acer platanoides (Norway maple, early bloom), Magnolia stellata (star magnolia, full bloom). If you are referring to the Phenology and Monitoring tables in OMAFRA publication 841, Guide to Nursery and Landscape Plant Production & IPM, look at the Tables starting with 2-3 on pg. 39.


Check out BugFinder, the scouting app for pests of Nursery-Landscape plants!  Its a FREE download from the Apple App Store.  Much of the info found in these blog articles can be found in greater detail in BugFinder. Android BugFinder coming to Google Play this summer!

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Dormant Oil For IPM

magnolia scale We’ve got milder temperatures starting and yes, it’s still a good time to get some dormant oil applications on in many areas of southern Ontario (Photo: overwintering nymphs of magnolia scale).

As long as there is Continue reading

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Spring is Springing!

It was quite the wait wasn’t it? After witnessing one of the warmest February’s on record, March was quite a shock. But we seem to be on track now with a warming trend on the 7 day weather forecasts.  Night time low’s will be mostly above 0C.  Which means we will be accumulating some much needs heat units (Growing Degree Days) this week.

Where the Silver maples are in full bloom, red maples and pussy willow are beginning to bloom, we are between 1-25 GDD’s Base 10C.  Want to make this even easier?  Go to the Apple App store and download BugFinder on your iphone/ipad for free.


Cooley spruce gall and Eastern spruce gall adelgid overwintering females can be found Continue reading

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eLandscape Helps Homeowners connect with Verified Pros

Have you heard of eLandscape?


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New Weed ID Resource for Ontario

Great New Resource for This Field Season: Weed ID Guide for Ontario Crops (this is a repost from ONfruit)

2017 Weed ID Guide 2

 The new Weed ID Guide for Ontario Crops features over 120 species commonly found in and around agricultural fields, and is now available in the following formats:

  1. ePub format (124 MB file for Kindle, iBooks and other e-reader apps): click to download
  2. .pdf format (8 mb file): click to download
  3. print ready .pdf (141 mb file): click to download
  4. Print Copy (printing and shipping costs apply, volume discounts available): click to order



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