Welcome to our new 2017 LO Nursery Scout and OMAFRA Summer Student! Melissa Huntley (left) and Andrea Badder (right) have been working diligently to scout for pests and abiotic issues in nursery crops. The cold, rainy weather is no problem for this dynamic duo……if there’s an issue, they will spot it. Both Melissa and Andrea are undergraduate students at the University of Guelph and they are stoked about gaining more experience with the nursery and landscape industry.
Plant Phenology Indicators: GDD Base 10C: 55-100
1. Acer platanoides (Norway maple, full bloom)
2. Acer saccharum (sugar maple, late to finishing bloom)
3. Amelanchier spp. (serviceberry, mid-full bloom)
4. Forsythia (finishing bloom).
5. Magnolia x soulangeana (saucer magnolia, late bloom)
7. Syringa vulgaris (common lilac, flower bud (not blooming yet)
2017 is gearing up to be an fantastic year for sucking insect pests and disease. Prolonged leaf emergence brought on by cool weather is increasing the susceptibility period of many ornamentals, for longer than they would be normally.
Look for aphids causing leaf curl, distortion and stunting on various herbaceous and woody ornamentals. Suppress populations of aphids with insecticidal soap, or traditional insecticides (Kontos, Beleaf, Endeavor, Tristar). Sucking insect pests can do a lot of damage and reduce plant health.
Fall Cankerworm larvae are hatching and these tiny, green inchworms are making their way to newly emerging foliage to begin feasting. They are about 5-6 mm long and hiding on the undersides of leaves. You may find some very subtle holes beginning to show on the tops of leaves. Their dull light green colour enables them to blend in with foliage well. Where populations were high last year, monitor for larvae on several hosts such as Acer, Tilia, Quercus, Ulmus etc. A foliar application of the bio-insecticide Dipel (Bacillus thuringiensis, B.t.). can help to significantly reduce populations and subsequent injury.
Fall cankerworm larvae were those green larvae suspended by threads that everyone was complaining about in the Hamilton area last spring (photo Chris Hsia). For great images and management information check out our free scouting App Bugfinder, on Apple (Android coming soon).