June 15, 2008
By Jen Llewellyn,
OMAFRA Nursery Crops Specialist

Diseases and insect pests In mid-June to mid-July
a) In areas where the following phenology plants (250-400 GDD Base 10oC):
    Kolkwitzia amabilis (beautybush) are blooming
    Philadelphus 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)
juniper juniper scale (crawlers)
larch larch casebearer (adults)
lilac lilac borer (adults, eggs)
mountain ash mountain ash sawfly (larvae)
pine European pine shoot moth (egg hatch), pine needle scale (crawlers)
rhododendron, yew black vine weevil (adults)
rose rose chafer (adults), rose slug [sawfly] (larvae)
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 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)
Check out OMAFRA Publication 383, Nursery & Landscape Plant Production and IPM for more detailed monitoring tables (Chapter #3). To order, call 1-800-668-9938.

The Nursery-Landscape Report may be found at: http://apps.omafra.gov.on.ca/scripts/english/crops/agriphone/index.asp
Jen Llewellyn can be reached at (519) 824-4120, ext. 52671 or by e-mail at jennifer.llewellyn@ontario.ca