Hello Daniel,

I examined the images that you provided. It is hard to make out the larva in the images. Hopefully, the below article will help - It has images too.

This is Michigan State University - Integrated Pest Management article on the Grape berry moth - Insect - Paralobesia viteana (Clemens Tortricidae: Lepidoptera

Grape berry moth spends the winter as a pupa in leaf litter in and around vineyards. First-generation adults emerge from the pupae before bloom. Male and female moths mate and then females lay circular, flat eggs directly onto the cluster around bloom. The eggs can be difficult to find because of their small size (approximately 1 mm diameter). Their shiny exterior can be used to detect them, especially with a hand lens. Eggs parasitized by wasp parasites turn black.

Larvae hatch from the eggs in 3 to 6 days, depending upon temperature, and feed on the cluster until they have developed to full size. Larvae of the first generation feed on young grape clusters and may remove sections of clusters. Then, when berries are formed, the young larvae burrow into the fruit. Webbing and larvae are visible in the small clusters during and after bloom. Damage from the red-banded leafroller can be mistaken for a grape berry moth at this time, so it is important to identify the larvae to determine the appropriate management strategy.

Damage: Larvae of the third generation feed inside berries before and after veraison. Berries may be hollowed out by feeding, and larvae at this time may contaminate harvested fruit. Damage by grape berry moth after veraison predisposes berries to infection by Botrytis and sour rots and can attract fruit flies, wasps, and ants.

Management: In Michigan, Pennsylvania, northern Ohio, and New York, it is important to scout in mid-to-late July for eggs and larvae. Detecting egg-laying and egg hatch help accurately time insecticide controls. In high-pressure vineyards, egg-laying may continue over many weeks late in the season. Infestation is often greater on the border than the interior of vineyards, particularly near woods or hedgerows. Regular cluster sampling in the vineyard interior and at the borders (particularly next to woods) can help to assess berry moth infestation levels and determine management needs.

The above information is at this link: https://www.canr.msu.edu/ipm/diseases/grape_berry_moth

Also, please check out this article:

Mid-season management of grape berry moth - Rufus Isaacs, Jacquelyn Perkins, and John Wise, Michigan State University Department of Entomology, and Michael Reinke, Michigan State University Extension - July 1, 2020 - Spray after the July 4 weekend to protect against the second generation of grape berry moth. At this link: https://www.canr.msu.edu/news/mid-season-management-of-grape-berry-moth

Hope this helps

If the above information does not identify your pest as the grape berry moth you can get a confirmed identification and diagnosis of your grape berry moth from the MSU Diagnostic Plant Lab

MSU Plant & Pest Diagnostics is no longer accepting walk-in consultations at this time. They are open for business for all samples that are dropped off or mailed to the lab. When submitting plant samples, they encourage clients to email digital images to accompany the physical samples. Images can be sent to <personal data hidden>.

From the lab: Please do not ship samples on Fridays. Due to the current COVID-19 circumstances, please allow additional processing time. They thank you for your patience and understanding.

There is a $20-25 dollar fee (if they need a sample sent). I am guessing that the lab will probably want a sample to look at under the microscope

Every sample must be accompanied by a completed submission form. Please place the form in a separate resealable bag to prevent it from getting damp or soiled.

The form is at this link:

https://www.canr.msu.edu/pestid/uploads/files/MSU-DS-Form-012-001-version6.0.pdf

Complete details of submitting a sample are at this link: https://www.canr.msu.edu/pestid/submit-samples/

Hello Daniel,

Remember when submitting plant samples, the MSU Plant and Pest Lab encourage clients to email digital images to accompany the physical samples. Images can be sent to <personal data hidden>. 

Please e-mail the images the same time you drop off the samples

By the way, your additional images look great!! I think the lab will like them. Gives them more to work with!!

Please remember that: Every sample must be accompanied by a completed submission form. Please place the form in a separate resealable bag to prevent it from getting damp or soiled.

The form is at this link:

https://www.canr.msu.edu/pestid/uploads/files/MSU-DS-Form-012-001-version6.0.pdf