Hello,

Based on your images and description:

Let’s explore the swollen stems and white tissue you’ve observed. 

Strawberries and Their “Seeds”: When it comes to strawberries, what we commonly think of as seeds are actually the fruits themselves. The ripe, red, fleshy part that we enjoy is technically swollen receptacle tissue – the part of the plant that connected the flower to the stem. Each of these “seeds” on the outside of a strawberry contains a single seed inside. More information at this link:

Why Do Strawberries Have Their Seeds on the Outside? | NC State News (ncsu.edu)

So, those swollen sections you’ve noticed might be part of the strawberry’s natural structure.

Other Possible Causes of Swollen Stems:

Southern Stem Blight (Sclerotium rolfsii): This soilborne fungal pathogen can cause white mycelium growth on infected plants. It often forms a fan-shaped pattern and may have ropy strands. In severe cases, it can lead to sudden plant collapse. Additionally, it causes soft rot of fruit. More information at these links:

Southern Stem Blight of Strawberry | NC State Extension Publications (ncsu.edu)

Southern Stem Blight | Strawberry Diagnostic Key | NC State (ncsu.edu)

If you suspect this disease, consider examining the base of the affected stems for diagnostic white mycelium.

Other Factors: Apart from diseases, environmental factors like water stress, soil conditions, or physical damage can also lead to swollen stems. Ensure that your raised bed has good drainage and that you’re watering appropriately. Avoid overwatering, especially on the flowers and fruit, as it can contribute to fungal issues.

Recommendations:

I recommend you send all your images by e-mail to the MSU Plant & Pest Diagnostics Lab for a confirm and precise identification. The experts there can also provide you with the best treatment options. Their email is <personal data hidden> - Please include your name – The lab will let you know if they need a sample sent. FYI – The lab may also ask for additional images too.

Their website is at this link:

Plant & Pest Diagnostics (msu.edu)

Their Contact Information is at this link:

Contact Us - Plant & Pest Diagnostics (msu.edu)

This link will explain the details on submitting a sample to MSU Plant & Pest Diagnostics Lab:

Submit Samples - Plant & Pest Diagnostics (msu.edu)

Also, maintain proper cultural practices, including watering early in the day and using straw mulch under the plants to reduce soil moisture fluctuations. More information at this link:

Growing strawberries in the home garden | UMN Extension

I hope this helps!