Gypsy Moth Life Cycle Eggs/Egg Mass; 200 to 800 eggs in a egg
mass Hatch: early May, timed with oak leaf-out Located on tree
trunks, under branches Caterpillar: ID: 5 pairs of blue dots &
6 pair of red dots 6 to 8 weeks, to end of June-early July 5 to 6
stages, larva instars Shed skin at each instar Most of the leaves
eaten in last two instars Prefer oak, aspen, basswood, beech
Pupa/Cocoon: Caterpillar to moth 1 to 2 weeks Reddish to black
color Moth/Adult: Male & female moths last for 1 to 2 weeks
Mate, lay eggs, & die Eggs over-winter until following spring
Female white and male buff colored Female moth does not fly
Slide 36
Hemlock Wooly Adelgid (HWA) Non-native native to China and
Japan First found in PA, in the late 1960s Now has been IDed in 2/3
of PA Counties Population has been very low for several years Feeds
on all hemlock varieties A very complicated life cycle Two
generations per year but 2 nd generation is inactive during the
summer Feeds by attaching itself to the base of the needle and
sucking sap Others elongate scale, mites, drought Forecast
Increasing again in 2006 mild winter
Slide 37
Emerald Ash Borer Exotic Beetle from Asia Discovered in
Michigan in July 2002 Discovered in western PA in June 2007 Adult
Beetles: Metallic green wing covers to long Peak emergence late
June & early July Live for about 3 weeks mate, lay eggs &
die Feeds on the margins of ash leaves Males are smaller than
females Adults are strong fliers up to a mile Eggs/Egg Mass: Female
can lay 60 to 90 eggs July/August Eggs deposited in bark crevices
anywhere on the tree Eggs hatch in 7 to 10 days - August
Larvae/Borer: Bore into tree immediately after egg hatch White grub
full grown 1 to 1 long Feeds on the cambium layer between the bark
& wood Only feeds on ash species Feeding is completed in autumn
Over-winters in phloem/cambium layer Pupation: Larva to adult
beetle (pupation) occurs in April/May Damage to tree: Feeding in
the phloem/cambium layer girdles the tree Feeds on the upper
branches & main stem first Trees often die after 3 to 4 years
after infestation
Slide 38
Eastern Tent Caterpillar Life Cycle Eggs/Egg Mass; 100 to 250
eggs in mass Hatch: end of April/early May Located on ends of
branches Caterpillar: 6 to 8 weeks, to end of June 5 stages, larva
instars Shed skin at each instar Most of leaf eaten in last two
instars Prefers cherry, apple, and other fruit trees Pupa/Cocoon:
Caterpillar to moth 1 to 2 weeks White to yellowish color
Moth/Adult: Male & female for 1 to 2 weeks Mate, lay eggs,
& die Eggs over-winter until following spring
Slide 39
Forest Tent Caterpillar Life Cycle Eggs/Egg Mass; 100 to 250
eggs in mass Hatch: end of April/early May Located on ends of
branches Caterpillar: 6 to 8 weeks, to end of June 5 stages, larva
instars Shed skin at each instar Most of leaf eaten in last two
instars Prefers sugar maple, ash, aspen Pupa/Cocoon: Caterpillar to
moth 1 to 2 weeks, Moth/Adult: Male & female for 1 to 2 weeks
Mate, lay eggs, & die Eggs over-winter until following
spring