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pest in developing Honeycrisp apples - dimples #873026

Asked June 13, 2024, 5:47 PM EDT

Something (insect pest?) is causing dimples on my newly developing honeycrisp apples. I had good pollination on my 15 year-old trees; the fruits are now about 1 inch diameter. About 10% of the fruits are affected.as of today, 13 June, with anywhere from 1 to 4 dimples on each affected fruit. What insect or other pest is causing this and what can I do to prevent it from happening to more of the developing fruit? Attached are two images, first an image of two fruits with visible dimples; second an image of a fruit sectioned (cut) in half. It seems there is evidence of some insect larva within the fruit the second image. My understanding is that apple maggots (railroad worms) normally do not make an appearance until later in the season, normally into July. Has the warm winter of 2023-2024 caused an early emergence? Any advice or tips are much appreciated. Otherwise the trees are healthy and in good condition. Thanks in advance for your reply.

Nicollet County Minnesota

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