Protect Evergreens Starting As New Growth Emerges

Monitor for needlecast and blight diseases on older foliage where new foliage is emerging on Austrian pine and Colorado spruce.

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An Ill Wind That Blows No Good….#GypsyMoth 2021

The warmer weather has supported the continued hatch and excitement for first instar Gypsy moth (Lymantria dispar) larvae this week!  The cool temperatures of last week had larvae huddled up in wait.  But the sudden heat and warm breezes have convinced 1st instar larvae to climb up to the top of their egg mass hosts, cast out a tiny thread and balloon out in the air in hopes of landing on a desirable plant host.  But there are so many larvae in some areas….they are also landing on you and me.  

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Agri-Tech Innovation Program – Early Adopters Stream is OPEN

Field Production of Deciduous Trees at Winkelmolen Nursery, Ontario

Calling all Nursery Growers!

The Agri-Tech Innovation Program -Early Adopters Stream- is LIVE!

Funding for Advanced Technologies to Mitigate COVID-19 Transmission Risk in the Agri-Food Sector

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Box Tree Moth Larvae Are Starting to Feed in Toronto

LOOK FOR these EARLY SIGNS: Overwintered BOX TREE MOTH LARVAE are waking up and starting to feed on leaves in Toronto. These young larvae chew one side of the leaf and leave behind webbing and frass. (photo: J. Llewellyn).
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They’re BACK! Gypsy moth are hatching!

Gypsy moth larvae are starting to hatch in Southern Ontario! (Photo: Meadowood Tree Service)

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Scout Evergreens Now to Catch Pests Early

Twisted needles from balsam twig aphid feeding

Monitor for newly hatching Balsam Twig Adelgid Stem Mothers now to avoid feeding damage later this spring (Photo: Jen Llewellyn)

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Those Precocious Blooms of April!

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      Norway maple (Acer platanoides and its cultivars) are just starting to bloom in the GTA, making this one of the earliest blooms for trees since 2012!

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April Showers and April IPM Opportunities

Image result for silver maple flowers

Photo of silver maple flowers: Carl Strang, Nature Inquiries

Unusually warm weather has hastened the flowering of many trees, shrubs and bulbs!  Although we have more seasonable daytime high’s in the forecast for the next week, night time low’s will be  above 0C in southern Ontario.  Silver maples may still be blooming north of Hwy #9 but they have finished blooming to the south.  Continue reading

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Crabapple Disease Management Begins Soon!

MalusJulyWhatHappened

Remember this?  This is what apple scab can do to many of our older, susceptible apple, crabapple, hawthorn cultivars after cool, wet springs.  Disease inoculum (sporulating structures called “pseudothecia”) can be found inside overwintered fallen leaves from 2020, waiting for enough heat and moisture to be able to be fertilized, mature and release infective two-celled “ascospores” in the rain and wind. (If you inspect old apple leaves, the pseudothecia resemble black dots.)  If we get another cool spring with frequent precipitation during leaf emergence periods, we could be heading into another perfect storm for disease. Continue reading

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2021 Will Be Remembered as “The Year of the Gypsy Moth”

beige Gypsy moth egg masses in groups clinging to the bark on the undersides of branches and on the trunk
Gypsy moth (Lymantria dispar) egg masses adorn many of the trees in urban and rural southern Ontario this spring. Unusually warm temperatures have supported the rapid growth of developing larvae inside these egg masses. (Photo: Jen Llewellyn)
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