My tomato plant has issues.

[jjob222]

Hi I have a Brandywine tomato plant in Bundaberg Queensland. Some of the leaves are yellowing, new ones stunted some deformed. Other leaves vigorous and healthy. One nice fruit has formed, most flowers just drying and dropping. The stem has a slightly rusty look. At first signs of trouble 2 weeks ago I sprayed with copper sulphate and hydrated lime but the issue is gradually worsening. Every 2 to 3 weeks I give a feed of fish emulsion thrive. In the container is a high quality vegetable growing mix with a bit of added dynamic lifter. Plant has been growing well under these conditions until around 3 weeks ago.

 

 

  

[MitchellMc]

Welcome to the Bunnings Workshop community @jjob222. It's marvellous to have you join us, and many thanks for your question about tomato care.

It sounds like your tomato is dealing with a combination of issues. The yellowing leaves, stunted growth, and flower drop suggest a possible nutrient imbalance or disease. The rusty look on the stem could indicate early signs of fungal or bacterial infection, especially given Bundaberg's warm, humid conditions.

Since you’ve already applied copper sulphate and hydrated lime, fungal issues like early blight or bacterial speck might be less likely. However, excessive use of copper can sometimes cause stress, so it’s worth monitoring. The irregular growth and flower drop could point to nutrient deficiencies, particularly calcium or magnesium. Adding a balanced fertiliser with trace elements and a dose of liquid seaweed might help.

Ensure the plant isn’t experiencing water stress—overwatering can lead to root issues, while underwatering can cause nutrient uptake problems. Since it’s in a container, check that drainage is adequate and roots aren’t compacted. You could also try hand-pollinating flowers to improve fruit set.

If the issue worsens, consider pruning affected leaves to improve airflow and reduce disease spread. Let me know if you notice any additional symptoms, like spotting or curling on the leaves, as that could help narrow it down further.

Please let me know if you have any questions.

Mitchell