Pheno Forecast map for emerald ash borer for April 26, 2023. Colors indicate the status of adult emergence. The status of a location is
determined by comparing local degree-day accumulations to an established degree-day accumulation threshold for the life-cycle stage.
Other Pheno Forecasts
USA-NPN Pheno Forecasts and notifications are available
for 12 insect pests and several plant species:
• apple maggot (Rhagoletis
pomonella) – adult emergence
• Asian longhorned beetle
(Anoplophora glabripennis)
– adult emergence
• bagworm (Thyridopteryx
ephemeraeformis) –
caterpillar emergence
• bronze birch borer (Agrilus
anxius) – adult emergence
• eastern tent caterpillar
(Malacosoma americanum)
– caterpillar emergence
• hemlock woolly adelgid (Adelges
tsugae) – presence of eggs,
presence of active nymphs
• lilac borer (Podosesia syringae)
– adult emergence
• magnolia scale (Neolecanium
cornuparvum) – crawler
emergence
• pine needle scale (Chionaspis
pinifoliae) – crawler emergence
• spongy moth (Lymantria dispar)
– caterpillar emergence
• winter moth (Operophtera
brumata) – caterpillar emergence
• buffelgrass (Pennisetum
ciliare) – 50% green-up
• red brome (Bromus rubens)
– flowering, senescence
• winter wheat – vegetative
and reproductive stages
Learn more: www.usanpn.org/data/forecasts
Report pest activity at your site
over the season. Tracking when
various species undergo life cycle
stages at your site can help you
choose the best time to perform
management activities and serve
as an early warning indicator of
trouble brewing among your trees.
You can track the timing of activity
of emerald ash borer, additional tree
insect pests, and over 1,700 other
plant and animal taxa using Nature's
Notebook, the plant and animal phe-
nology monitoring program offered
by the USA-NPN. The USA-NPN uses
observations submitted through
Nature's Notebook to validate and
improve the Pheno Forecast maps.
To support volunteers in identi-
fying and reporting on emerald
ash borer, the USA-NPN offers an
EAB Phenology Learning Module.
Explore the module, after signing
up for a Nature's Notebook account,
at learning.usanpn.org.
urban-forestry.com 13
