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SWD in plums

I have begun examining plums collected in the Finger Lakes and Lake Ontario regions and, to date, have found evidence of oviposition only in samples collected in the Finger Lakes region. As populations of SWD build during late summer and plums ripen on the tree, fruit may be at increasing risk. Which plum varieties are at greatest risk of being infested? Those that have the softest skin and those that ripen latest will likely be most susceptible.

A micrograph of the surface of a plum showing the breathing tubes attached to a fruit fly egg nestled below the surface of the plum’s skin. Only two of ten tree-ripe plums had such eggs, however, one plum had eight oviposition sites.

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