Tomatoes End Of Season Decline

There are several causes of yellowing leaves on tomatoes and often what we see is the combination of several problems.
1. Leaf spot fungus. This is very common on tomatoes – be it septoria leaf spot or another fungal disease. In general get accustomed to picking off the worst of the leaves and spraying the plants with an organic fungicide from early in the season on. Ask at your garden center for an organic fungicide and use according to directions.
2. Once your plant shows signs of yellowing and spotted leaves you might have more success with a copper fungicide, which is also an organic treatment. Use once a week according to directions to extend your season of harvest.
3. End of season cool temperatures. Tomatoes do best in hot weather. When the temperatures cool at the end of the growing season the plants start to shut down. The older leaves naturally turn yellow and any leaf-spot damage shows up more. This is natural and nothing that needs treatment. Clip off the worst of the leaves and any spotted or rotting fruit and throw it in the garbage. Pick ripening tomatoes early and let ripen on the windowsill if necessary.
4. Enjoy every single ripe fruit or other produce from your garden – at this time of year things start to close up shop, so we need to be especially appreciative of every harvest we get!