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Medium_tomato_leaf Disease starting on tomato leaves - warm, humid and drizzly weather

Hello. It's been awful weather recently, and I've started noticing these grey / black edges on my tomato leaves. Is it a disease? I took the leaves off immediately, so haven't watched to see if they progress further (e.g. grow yellow spots).

I would normally spray with a fungicide just as a precaution. However, as my plant was recently attacked by thrips / flies, I'd gone to town with Yates white oil (insect damage gone)! Last application was 2 days ago.

Most of your fungicides say do NOT apply with insecticides / oil, and I know sulfer + oil combo is a killer for plants.

Can you help identify the disease, and also what to spray the plant with? Thanks!

Submitted: 09:59AM, 25 Oct 2017
Answer: Hi Kay,

Thank you for contacting Yates.

It is unfortunately difficult tell what is going on with the plant from the example provided. The blackening on the edges can be due to either fungal, bacterial or water damage.

It is correct that you should not apply any products containing sulphur to a plant after spraying with the white oil and is best to wait at least 2 weeks to apply such a product.

In your case, as you have had some wetter weather and issues with the pests, it is highly likely that you will encounter some fungal issues on the tomatoes. In this case we recommend that you apply Yates Tomato & Vegetable Dust to your tomatoes to help combat issues such as early blight, leaf spot and powdery mildew.

Remember to keep giving them a regular feed with Yates Thrive Naturals Vegie & Herb Liquid Plant food and you will soon be enjoying your harvest in no time!

Kind regards

Yates Horticulturalist

Category: Diseases
Answered: 03:15PM, 25 Oct 2017


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