Protect Evergreens Now, New Growth is Starting To Emerge!

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


Diplodia tip blight on Austrian pine

Continue reading

Posted in Diseases, IPM | Tagged , , | Leave a comment

Aphids Among Us



Snowball aphid damage on Viburnum

Populations of Aphids are starting to really take off this spring on greenhouse and outdoor ornamentals.  They are loving the softer tissue from this cool spring.  Usually aphids are not life threatening to woody plants, but they can stunt growth and they are unsightly to consumers.

Continue reading

Posted in Uncategorized | Leave a comment

Fall Cankerworm & Gypsy Moth Populations Looking Moderate-High in Some Areas

FallCankerwormLarvaSugMapleJLA_bb crop                Seeing holes in leaves on deciduous trees?  This sugar maple was showing interveinal holes and closer inspection revealed fall cankerworm (Alsophila pometaria) larvae on the leaf undersides.  Larvae are pale green (although you’ll often see darker races too) and blend in with newly emerged foliage.  They are only about 5-8 mm long right now but oye, can they eat!  Continue reading

Posted in Arboriculture, Insects, Weekly Nursery Landscape Report | Tagged , , , , , | Leave a comment

Welcoming The Victoria Day Long Weekend!

Those Blasted Black Flies!

May 24 is here!  And here’s some advice from the Farmer’s Almanac:

When you do get attacked by black flies, there are a number of things you can do to soothe the itch:

  1. Wash the affected area with soap and warm water
  2. Avoid scratching the bites as much as possible. Scratching can break the skin, increasing the risk of infection.
  3. Apply a topical agent, such as aloe vera, witch hazel, or a gentle over-the-counter remedy, such as calamine lotion, which can also help. If the itching persists, or is very bad, an antihistamine cream may be needed.”

Continue reading

Posted in Arboriculture, Diseases, IPM, Nursery Production, Weekly Nursery Landscape Report | Tagged , , , , | Leave a comment

Keep Protecting Susceptible Malus, Pyrus etc.


Remember this?  This is what apple scab did to many of our older, susceptible crabapple cultivars in 2017.  Protect new growth of Malus before leaf wetness periods.  (This is a REMINDER summary of the post from April 20, 2018)
Continue reading

Posted in Diseases, IPM, landscape, Nursery Production | Tagged , , , | Leave a comment

Insect Pests on Evergreens Right Now

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

Posted in Insects, landscape, Nursery Production | Tagged , , | Leave a comment

Protect Crabapple, Serviceberry, Pears 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 be found sporulating when the Cercis canadensis (redbud) begin to bloom, unless it is too dry.

CedarAppleRustJLA                                        Monitor for Gymnosporangium rusts such as Cedar-apple rust (above) Continue reading

Posted in Diseases, landscape, Nursery Production | Tagged , , , | Leave a comment