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- [Mark] This is Mark
Isselhardt, Maple Specialist

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with the University of Vermont Extension

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and this is another Vermont Maple Minute.

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Para Thrips is a species of insect,

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that while native to Europe and Eurasia,

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has been present in the United
States for over 100 years.

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This insect is slender
and brown as an adult

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and just over one millimeter long

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with delicately fringed wings.

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Thrips were first noticed as
a pest in Vermont sugar bushes

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in the 1980s when significant
damage was observed statewide.

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Adults emerge from underground
in spring, usually in April.

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The damage caused by Thrips

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mostly appears as tattered leaves.

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It has also been described as
being like making paper dolls

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since the damage is done
before leaves fully unravel

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and you won't know the total damage

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until the leaves have completely emerged.

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This damage is the result
of larval Thrips injuring

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very young leaf tissue as
they feed on plant juices

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before leaves have fully
developed from the winter bud.

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It appears that greater damage
is caused when adults emerge

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at a time when cool wet
spring weather delays

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the rate of leaf expansion.

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Despite weather conditions in 2019

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that might have contributed
to increased Thrip damage,

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luckily no reports were received.

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This is Mark Isselhardt, Maple Specialist

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with the University of Vermont Extension

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and this has been another
Vermont Maple Minute.