Spring and warm weather are finally here, bringing new growth and life.
But they also bring increased forest pest activity.
Now
is the time for landowners to check their trees to inspect for any signs of
pests and/or pest damage.
One
common Texas spring time pest seen in pine trees is the pine sawfly – a
defoliator. Signs of sawfly infestation
may be the unexpected shedding of needles.
Typically, sawflies infest single or small groups of trees but if
conditions are favorable, larger areas may be affected. Loss of tree growth is
common, though repeated attacks for two or more years may cause mortality.
Pine
sawfly caterpillars which, depending on the species, can be either
yellowish-green or olive green colored, begin to feed on pine needles in late
spring. Wilted, browning or missing
needles warrant a closer inspection to determine if sawflies are active.
Usually, no control is
warranted as infestations are typically localized and quickly controlled by
natural predation, weather and disease organisms. Sawfly control methods, if
desired, are most effective during the caterpillar stage.
High-pressure water jets
may remove large clusters of larvae, though this technique may require some
specialized equipment to reach larvae high in the tree.
Insecticides
such as cyfluthrin, permethrin, insecticidal soap and spinosad can be effective
but are usually only used to protect high-value trees and then only after
repeated defoliations. Always follow the directions on the label of the
pesticide to make sure that the chemical is labeled for use against sawflies
and to ensure that the application will be effective. Remember:
The Label Is The Law.
Contact
your local Texas A&M Forest Service office at https://tfsweb.tamu.edu/contactus/county-search/ for assistance or more
information regarding forest and tree pests.
You may also learn more about pine
sawflies at https://tfsweb.tamu.edu/uploadedFiles/TFSMain/Manage_Forest_and_Land/Landowner_Assistance/Stewardship(1)/Pine_Sawfly.pdf
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Contacts:
Allen
Smith, Regional Forest Health Coordinator, Texas A&M Forest Service,
903-297-5094, lasmith@tfs.tamu.edu
Texas
A&M Forest Service Communications Office, 979-458-6606,newsmedia@tfs.tamu.edu