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Ocn319079567-2021-05-14.Pdf (747.4Kb) Visit Apply Give Center for Agriculture, Food, and the EnvironmentSearch (/) UMass.edu UMass Extension Landscape, Nursery and Urban Forestry Program (/landscape) Search CAFE LNUF Home (/landscape) About (/landscape/about) Newsletters & Updates (/landscape/newsletters-updates) Publications & Resources (/landscape/publications-resources) Services (/landscape/services) Education & Events (/landscape/upcoming-events) Make a Gift (https://securelb.imodules.com/s/1640/alumni/index.aspx? sid=1640&gid=2&pgid=443&cid=1121&dids=2540) Landscape Message: May 14, 2021 May 14, 2021 Issue: 6 UMass Extension's Landscape Message is an educational newsletter intended to inform and guide Massachusetts Green Industry professionals in the management of our collective landscape. Detailed reports from scouts and Extension specialists on growing conditions, pest activity, and cultural practices for the management of woody ornamentals, trees, and turf are regular features. The following issue has been updated to provide timely management information and the latest regional news and environmental data. The Landscape Message will be updated weekly in May. The next message will be posted on May 21. To receive immediate notication when the next Landscape Message update is posted, be sure to join our e-mail list (/landscape/email-list) To read individual sections of the message, click on the section headings below to expand the content: Scouting Information by Region Environmental Data The following data was collected on or about May 12, 2021. Total accumulated growing degree days (GDD) represent the heating units above a 50° F baseline temperature collected via regional NEWA stations for the 2021 calendar year. This information is intended for use as a guide for monitoring the developmental stages of pests in your location and planning management strategies accordingly. Soil Temp GDD (°F at 4" MA depth) Precipitation Time/Date of Region/Location (1-Week Gain) Readings 1-Week 2021 Total Sun Shade Gain CAPE 19 89.5 55 51 1.12 12:00 PM 5/12 SOUTHEAST 26.5 122.5 69 54 1.01 3:30 PM 5/12 NORTH SHORE 30 129.5 53 47 0.48 10:30 AM 5/12 EAST 28 141 62 54 0.35 4:00 PM 5/12 METRO 22.5 130.5 51 47 1.57 5:30 AM 5/12 CENTRAL 18.5 133.5 54 52 0.67 7:00 AM 5/12 PIONEER VALLEY 14.5 135.5 55 51 0.85 11:00 AM 5/12 BERKSHIRES 0 79.5 53 46 0.90 8:15 AM 5/12 AVERAGE 20 120 57 50 0.87 _ n/a = information not available Drought has recently been alleviated in MA - check here: https://droughtmonitor.unl.edu/CurrentMap/StateDroughtMonitor.aspx?MA (https://droughtmonitor.unl.edu/CurrentMap/StateDroughtMonitor.aspx?MA) Phenology INDICATOR PLANTS - STAGES OF FLOWERING (BEGIN, BEGIN/FULL, FULL, FULL/END, END) PLANT NAME (BOTANIC/ CAPE S.E. N.S. EAST METRO W. CENT. P.V. BERK. COMMON) Aesculus * * * * * * Begin Begin hippocastanum (common horsechestnut) Rhododendron Begin * * Begin * * Begin * carolinianum (Carolina rhododendron) Deutzia spp. Begin Full Begin Begin Begin Begin Begin * (Deutzia species) Spiraea x * Full * Begin Begin Begin Begin * vanhouttei (Vanhoutte spirea) Elaeagnus Begin/Full Full Full Full Full Full Full * umbellata (autumn olive) Syringa vulgaris Full Full Full Full Full Full Full Begin/Full (common lilac) Cornus orida Full Full/End Full Full Full Begin/Full Full Begin/Full (owering dogwood) Rhododendron Begin/Full Full Full Full Full Full Full Full spp. (early azaleas) Malus spp. Full Full/End Full Full Full/End Full Full/End Full (crabapple) * = no activity to report/information not available Regional Notes Cape Cod Region (Barnstable) General Conditions: The average temperature from May 5 to May 12 was 51˚F, with a high of 65˚F on May 11 and a low of 40˚F on May 7. The period was much sunnier than the previous period, with May 8 being the only completely cloudy day. Just over 1 inch of precipitation fell primarily on May 10, plus a little on the afternoon of May 5. Herbaceous plants in bloom include brunnera, pulmonaria, epimedium, fringed bleeding heart, merry bells, may apple, yellow alyssum, barren strawberry, common violet, lily of the valley, Solomon’s seal, vinca, money plant, creeping phlox, tulips, grape hyacinths, and some late daodils. Woody plants in bloom include Japanese owering cherry ‘Kwanzan’, eastern redbud, owering dogwood, saucer magnolia, Korean spice viburnum, Kerria japonica, bush honeysuckles, and PJM rhododendron. Forsythia bloom is just about at its end. Pests/Problems: Lots of questions about damaged rhododendrons have been pouring in. The dieback is primarily a result of last season’s drought, exacerbated by winter and soon to be susceptible to disease. Prune out damaged limbs. There are a great many dead arborvitae as well for the same reasons. Winter moth caterpillars are about 1cm in length at this time and have been seen on susceptible hosts such as maple, oak, apple and blueberry, in the past week. Winter moth populations are not expected to cause defoliation, but holes are likely to be seen in the leaves of host plants. An area in Mashpee with fall cankerworm defoliation last year yielded no signs of them this year. As caterpillars, winter moth and fall cankerworm can be dierentiated by the number of prolegs - winter moth having two and fall cankerworm having two and half. Lecanium scale is still present in high numbers in some locations and in other locations appears to be under control by entomopathogenic fungi. Scout for lecanium scale to determine whether treatment is necessary. The time to target this insect with dormant oil is still in play but only for a short while longer. Oak decline and mortality continue with white oak being harder hit. In many areas, scattered white oaks can be seen that look like they may not leaf out this year. Lichens are a good indicator of trees with chronic stresses – especially oaks. Other pests or damage seen in the past week include hemlock woolly adelgid on hemlock, spruce spider mite on Alberta spruce, boxwood leafminer damage on boxwood, tulip re on tulips, iris borer on bearded iris, and sycamore anthracnose on sycamore. Weeds seen in bloom include garlic mustard, cypress spurge, dandelion, annual bluegrass, common violets, yellow rocket, chickweed, and speedwell. Bittercress and arabidopsis are going ballistic at this point. The weather during this period was ideal for good weed seed germination. Red thread showed up big time late last week. Low maintenance ne fescue lawns always seem to be the lawns most aected. Rabbits continue to mow down favorite plants. Protect yourself from ticks! (See the Insect report below.) Southeast Region (Dighton) General Conditions: Among the many plants in ower I've noticed these: Alliaria petiolata (garlic mustard), Aquilegia (columbine), Arisaema triphyllum (Jack in the pulpit), Aurinia saxatilis (basket of gold), Barbarea vulgaris (yellow rocket), Cercis canadensis (redbud), Chelidonium majus (greater celandine), Chaenomeles (owering quince), Conium maculatum (poison hemlock), Convallaria majalis (lily of the valley), Cornus orida (owering dogwood), Dicentra eximia (fringed bleeding heart), Deutzia spp., Elaeagnus umbellata (autumn olive), Euphorbia epithymoides (yellow/cushion spurge), Fothergilla major (mountain witch alder), Geranium maculatum (wild geranium), G. sanguineum (cranesbill geranium), Halesia carolina (Carolina silverbell), Hyacinthoides hispanica (wood hyacinth), Iberis sempervirens (candytuft), Ilex x meserveae (blue holly), Iris germanica (German iris), Kerria japonica 'pleniora', Lamprocapnos spectabilis (bleeding heart), Lonicera morrowii (Morrow's honeysuckle), Lunaria annua (honesty), Magnolia x soulangeana, Malus (apples, crabapples), Narcissus (daodils), Osmunda claytoniana (interrupted fern), Ornithogalum (star of Bethlehem), Paeonia (herbaceous peony), Phlox subulata (creeping phlox), Polygonatum biorum (Solomon's seal), Potentilla simplex (oldeld cinquefoil), Prunus glandulosa (dwarf owering almond), P. martima (beach plum), P. serrulata (Kwanzan cherry), P. virginiana, (chokecherry), Pulmonaria (lungwort), Vaccinium corymbosum (highbush blueberry), Veronica liformis (slender speedwell), Viburnum burkwoodii (Burkwood viburnum) V. plicatum, (double-le viburnum), Viola papilionacea (common blue violet), V. tricolor (Johnny-jump-up), Vinca minor (periwinkle), Ranunculus repens (creeping buttercup), Rheum rhabarbarum (rhubarb), Syringa vulgaris (common lilac), Tulipa, Trillium grandiorum (white trillium), and T. sessile (toadshade). Pests/Problems: The following were observed: horns on cedar-apple rust galls on juniper (also see Disease report this issue below), European pine sawy on mugo pine, red thread on turf, and eastern tent caterpillar on black cherry. Ticks continue to be ubiquitous, so pay particular attention to pets and children. With many plants having leafed out, insect and disease issues have become more prevalent. It's time to make regular surveys of your plants to ensure issues don't get ahead of you. Those voracious caterpillars can defoliate your prize if you turn your back on them. Be sure to properly identify the larvae, choose the lowest impact management option available, and read thoroughly any product labels to avoid killing benecial insects such as pollinators. North Shore (Beverly) General Conditions: Most of the days during this period were sunny with lower than average temperatures for this time of the year. Daytime temperatures were in the mid-50s to low 60s and night temperatures were in the low to mid-40s. The average daily temperature for this period was 53°F with the maximum temperature of
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