Tomato plants turn black or leaves yellow - here is what to do

Many gardeners come across this problem. Often, you’ll see the black spots on the stems and leaves early on if it’s caused by bacteria, viruses or fungal infestation. You can lose your tomato plants if the infestation spreads.

Why do tomato plants turn black?

Sometimes you will find black spots on the leave, stems and fruit of tomato plants. The three common causes are:

• Bacteria, virus or fungal infestation,
• Nutrient deficiency
• Cold

To save your plants, remove the infected leaves or stems. Spray with a fungicide to keep them free from bacteria, viruses and mould.

Check out these garden DIY hacks.

Why tomato leaves turn yellow

Tomato leaves turning yellow is natural. The old leaves will change from green to yellow and brown.
Occasionally, tomato leaves prematurely turn yellow because of the following reasons:
- a lack of sunlight,
- waterlogged soil or
- lack of nutrients in the soil.

Make sure the plant receives at least 6 hours of sunlight, the soil is moist and well-drained and is rich in nutrients.
If the problem persists, give the plant some tomato feed. Nine out of ten times, this will improve the condition.

Alternatively, move the plant to a different area or bigger pot.

Tomato leaves turn yellow

Keep your tomato plants healthy

In most cases, prevention is better than cure.

The tomato plants will require feed as they grow. To keep them healthy, add tomato-grow.

Low temperatures can damage your tomato plants.

If you grow your tomato plants late, you’ll sometimes see black spots appear on the leaves, fruits and stems as the summer ends.

Move the plants indoors or into the greenhouse if you expect more flowers and fruit.

If the green tomatoes turn black, harvest them immediately before they rot.

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