Weeds to Watch: Invasive Pigweeds – Waterhemp and Palmer Amaranth

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By: Kristen Obeid, OMAFRA Weed Management Specialist – Horticulture
Dave Bilyea, Weed Management – Horticulture, University of Guelph, Ridgetown Campus

The first line of defense against waterhemp and palmer amaranth is proper identification.  It is EXTREMELY difficult to identify waterhemp and palmer amaranth from other pigweed species especially as seedlings.

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2018 Ontario Nursery Growers’ Tour!

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2018 Ontario Nursery Growers’ Tour — Wednesday, Sep 19th

Meet us at Connon CBV Wholesale Yard #656 Robson Road (7:15 am)

THEME:  “Sticking together”

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IPM in early August

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I’ve got something FORRRRRR you!

This beautiful, fat four-horned Sphinx moth larva  (Order: Lepidoptera; Family: Sphingidae; Species: Ceratomia amyntor) was found chewing on elm leaves by OMAFRA Field Tech Student Kaitlin Creighton and LO Nursery Scout Charlotte Thomson.  Knowing their supervisor’s sense of humour, Kait and Charlotte decided to stage a little “entomological giggle” and sent me this photo 🙂
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The Tuesday Report – July 24, 2018

Pear Blast                     Are you seeing black marginal necrosis on the newest growth of Pear (Pyrus) trees?  We saw the same phenomenon back in 2016 and after several attempts at culturing pathogens failed, we determined that the necrosis was the result of extreme weather. Southern Ontario has seen its fair share of sweltering heat and humidity this summer. Ten out of the last 23 days in Toronto have been recorded to exceed Continue reading

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Are You Seeing Nutritional Deficiency Symptoms on Woody Plants?

Red Maple Mn Defic                     Do you ever see chlorotic or stunted leaves and wonder if it could be a particular nutrient deficiency?  Soil nutrient testing can be a good tool to assess levels of macro and micronutrients.  We use soil tests to help make decisions about adding fertilizer and organic materials to the soil.  But what soil tests don’t tell you is Continue reading

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Time To Prune Boxwood and Eastern White Cedar

BoxLeafMinerDamageApril              Remember all those yellow spots on boxwood leaves we had this spring?  These were the feeding sites of the overwintering larvae of boxwood leafminer (Monarthropalpus buxi, M. flavus). Continue reading

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IPM This Week – July 9, 2018

Fall Webworm CT                 Fall webworm (Hyphantria cunea) are laying their eggs on foliage (Juglans, Prunus, Betula, Fraxinus) at this time (Photo: Charlotte Thomson, LO Nursery Scout). 

They have multiple generations per year and most people don’t notice them until they become more plentiful in late August when the larval feeding tents can be found all over the landscape. Prune out larval tents and destroy manually. 
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