Hello,

The blackish-purple spots on the leaves of your Lemony Lace Elderberry (Sambucus racemosa ‘SMNSRD4’) could be caused by a few different factors, such as fungal diseases, pests, or environmental stress. Here are some general guidelines that might help:

Fungal Diseases: Elderberries can be susceptible to fungal diseases like leaf spot or powdery mildew, which can cause discolored spots on the leaves. To manage fungal diseases:

Ensure good air circulation around the plants by spacing them properly and pruning any dense foliage.

Avoid overhead watering to keep the leaves dry.

Remove and destroy any affected leaves to prevent the spread of the fungus.

Apply a fungicide recommended for use on elderberries, following the label instructions carefully.

Pests: Insects like aphids or spider mites can cause damage that appears as spots on the leaves. To control pests:

Inspect the plant for signs of insects and remove them by hand if possible.

Use insecticidal soap or neem oil to treat infestations, following the product’s directions.

Environmental Stress: Factors like too much sun, windburn, or improper watering can also cause leaf discoloration. To mitigate environmental stress:

Ensure the plant is getting the right amount of sunlight and water according to its needs.

Protect the plant from strong winds if necessary.

Mulch around the base to help retain soil moisture and regulate temperature.

It’s also worth noting that the Lemony Lace Elderberry is known for its good sunburn resistance and is very cold hardy and wind resistant. Lemony Lace™ European red elder (Sambucus racemosa ‘SMNSRD4’): This is a bright golden, cut-leaf elderberry with good sunburn resistance. It reaches 3 to 5 feet high and wide. New growth starts out reddish, but changes to lemony yellow with white flowers and red fruit.

PLEASE NOTE:

For a confirmed and precise identification of the problem, I recommend you send all your images by e-mail to the MSU Plant & Pest Diagnostics Lab. 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) 

I hope this helps