Protect Evergreens Where New Growth is Emerging

Monitor for needlecast and blight diseases on older foliage where new foliage is emerging on PINE and SPRUCE.

PinusNigraComp Continue reading

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Welcome May 24 Weekend!

Image result for cold birds ontario

May 24 long weekend is here!  Although it may not be our provincial bird, the common loon has a signature call that is well known and often tied to fond memories of camping and cottaging (Photo: Radio Canada).  This bird is no stranger to cold water and cold temperatures that often characterize Ontario springs. The cool temperatures have extended leaf emergence of many woody ornamentals, which is not good.  When coupled with wet conditions, a prolonged leaf emergence period can Continue reading

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Welcome LO Nursery Scout and OMAFRA Students!

MelAndMay_17

Welcome to our new 2017 LO Nursery Scout and OMAFRA Summer Student!           Melissa Huntley (left) and Andrea Badder (right) have been working diligently to scout for pests and abiotic issues in nursery crops.  The cold, rainy weather is no problem for this dynamic duo……if there’s an issue, they will spot it. Both Melissa and Andrea are undergraduate students at the University of Guelph and they are stoked about gaining more experience with the nursery and landscape industry.

Plant Phenology Indicators: GDD Base 10C: 55-100
1. Acer platanoides (Norway maple, full bloom)
2. Acer saccharum (sugar maple, late to finishing bloom)
3. Amelanchier spp. (serviceberry, mid-full bloom)
4. Forsythia (finishing bloom). Continue reading

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Managing Spring Pests on Evergreens

Look for small, white, woolly tufts or masses on the twigs of hemlock (Tsuga canadensis) (Photos: Julie Holmes, CFIA). Right now is the BEST time to scout for Hemlock Woolly Adelgid (Adelges tsugae) because of the visibility of the egg masses.  It is not a common pest in Ontario, in fact it has been found Continue reading

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Protect Rosaceous Hosts Now From Juniper Rusts

Gymnosporangium rusts are sporulating now on Juniperus hosts.  Look for orange, gelatinous structures on foliage and stems of various Juniperus spp.  They are sporulating both in container production and in the field.  They can usually be found sporulating when the Cercis canadensis (redbud) begin to bloom, unless it is too dry (like it was in 2016).

CedarAppleRustJLA                                        Monitor for Gymnosporangium rusts Continue reading

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Protect Malus and Pyrus Now

ProtectNewMalusGrowth

Apple Scab (below) is normally reproducing and spreading this time of year and a break in the rain may give growers a short window of opportunity to spray protectant fungicides Continue reading

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April Showers, Bring May Diseases

SugMapleFlowerSkyComp

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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