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Originally Posted by BunjinEnt
Ding ding ding, we have a winner. ALDEVAUX. Thank you so much! It looked more like an animal than fungi or bacterial infection. But I thought I would leave it to the experts. Infected leaves have been removed and disposed of, but the tree that my undertory stuff resides has it too...
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Actually, you did not have to remove the affected leaves because the maggots that causes these spots are probably gone already and the spots would just remain the same, without any more damage, throughout the season.
In fact, after infection, these maggots soon mature and drop to the soil surface where they remain inside the soil for the rest of the season. However, another generation of these midges will emerge from the soil the following spring and since due to several factors like weather etc., the populations may vary from year to year and may be less noticeable next year. The damage is quite negligible,except for leaf appearance, and their management is not really necessary.