June 15, 2009
By Jen Llewellyn
OMAFRA nursery crops specialist

Each year OMAFRA specialists participate in the minor use workshops in Ottawa, organized by Agriculture Agri-Food Canada’s Pest Management Centre (PMC). By using the term minor use, I am referring to label expansions for pesticides that are already registered in Canada, but on other crops. We meet to set priorities for pest management for various crops across Canada. We also do a lot of networking with government, industry, consultants and the registrants.
 
Peter Isaccson, CNLA minor use coordinator, and I have been successful in past years in obtaining pest management priorities for outdoor ornamentals (nursery, landscape). After the priority has been appointed (e.g. leafhoppers on outdoor ornamentals), we work together to plan research trials that will demonstrate efficacy and crop tolerance.  This data is required in order to expand the product label to include outdoor ornamentals. This year, the PMC is supporting trials for leafhoppers on aphids, tar spot on Norway maple and assembling and submitting data for the pesticide label expansion package. There are new active ingredients for pest management in outdoor ornamentals. In many cases, these newer products are a lower toxicity than some of our traditional products.  

Diseases and insect pests In June

a) In areas where the following phenology plants (250-400 GDD Base 10oC):
Kolkwitzia amabilis (beautybush) are blooming
Philadephus coronarius (mockorange) are blooming
Syringa reticulata (Japanese tree lilac) are blooming
Catalpa speciosa (Northern catalpa) are blooming

Monitor for the following pests and diseases:
 
PLANT PEST
ash oystershell scale (crawlers, nymphs)
birch bronze birch borer (larvae)
cedar cedar leafminer (adults, larvae)
cherry (Prunus) peach tree borer (adults, eggs, larvae), Eastern tent caterpillar (pupae, adults)
deciduous trees plant bugs, aphids, leafhoppers, Gypsy moth (larvae, pupae)
elm elm leaf beetle (larvae)
euonymus Euonymus webworm (larvae, pupae), Euonymus scale (crawlers), black vine weevil (adults)
evergreens spruce spider mite (adults, eggs, nymphs)
honeylocust leafhopper, pod gall midge (larvae)
juniper juniper scale (crawlers)
larch larch casebearer (adults)
lilac lilac borer (adults, eggs)
mountain ash mountain ash sawfly (larvae)
pine European pine shoot moth (larvae), pine needle scale (crawlers)
rhododendron, yew black vine weevil (adults)
rose rose chafer (adults), rose slug [sawfly] (larvae), two-spotted spider mite (adults, eggs)
viburnum Viburnum leaf beetle (pupae, adults)
b)  In areas where the following phenology plants (500-700 GDD Base 10oC
Hydrangea arborescens ‘Grandiflora’ are in full bloom
Sambucus canadensis are in full bloom
Yucca filamentosa are in full bloom

Monitor for the following insects and diseases:
 
PLANT PEST
ash (green) leopard moth (larvae), emerald ash borer (adults, eggs, larvae)
deciduous trees Lecanium scale (nymphs), aphids, plant bugs (nymphs, adults), leafhoppers (nymphs, adults)
elm European elm scale (crawlers)
euonymus black vine weevil (adults, eggs), euonymus scale (2nd generation crawlers)
honeylocust leafhopper, podgall midge, honeylocust mite
juniper juniper scale (nymphs)
maple, silver cottony maple scale (crawlers, nymphs)
mountain ash mountain ash sawfly (larvae), rose chafer (adults)
pine redheaded pine sawfly (larvae), white pine weevil (pupae, adults)
rose Japanese beetle (adults), rose chafer (adults), rose slug [sawfly] (larvae), two spotted spider mite
pine pine tortoise scale (crawlers), pine sawfly (larvae), European pine shoot moth (adults, larvae)
spruce spruce bud scale (crawlers), strawberry root weevil (adults, eggs)
viburnum viburnum leaf beetle (adults, eggs)
yew, cedar    Taxus/Fletcher scale (crawlers, nymphs), black vine weevil (adults), strawberry root weevil (adults)