Tomato Plant Leaves Turning Black

January 15, 2020

Tomato Leaves Turning Black - small tomato plant in the yardThe leaves on my tomatoes growing outside are turning black. I live in New Zealand.



Bronze Post Medal for All Time! 140 Posts
January 15, 20201 found this helpful
Best Answer

This is a fungal disease caused by other insects. They have an natural product that you can buy from your home improvement that will help with the fungal and strengthen the vine!

Reply Was this helpful? 1

Bronze Post Medal for All Time! 105 Posts
January 15, 20200 found this helpful
Best Answer

This happens a lot of times with tomato plants. When I have had this problem in the past I mix some mild detergent with water and spray the leaves of my plants. If you have cut the plants you can not do this for 24 hours.

Reply Was this helpful? Yes
Answer this Question

5 More Questions

Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

September 25, 2008


In my greenhouse last year my tomatoes leaves went black and crispy. Now I have noticed the same is beginning to happen again. How can I stop this before I lose my plants? Would I need to disinfect the greenhouse?

A Northwood


A Northwood,

I've included some links below to some websites that may help you identify exactly what is going on with your tomatoes. From what you have described, it sounds to me like you have some type of blight problem going on. If that is the case, disinfecting your greenhouse is going to be essential to preventing further spread.


  • Repair tears in screens and seal cracks around doors and windows where airborne pathogens can enter.

  • Mulch walkways near your greenhouse to reduce weeds and help prevent the spread of soil-borne pathogens.

  • Always make sure all discarded fruit and dead plant debris is removed from your greenhouse promptly.

  • Sanitize hands, tools, pots, floors, shelves, etc., on a regular basis.

  • Wash greenhouse clothing and shoes regularly in hot water.

  • Keep houseplants out of the greenhouse during tomato production.

  • Tobacco users should be extra careful to sanitize their hands before touching tomatoes to avoid introducing tobacco mosaic virus to plants.

  • Good ventilation and proper temperature control are critical for reducing humidity and controlling airborne fungal diseases. To ensure good ventilation, allow several feet of airspace above the plants and use proper spacing between them.

  • Prune the suckers just below the first fruit set to maintain good air circulation within the plant's canopy.
Links to help with diagnosing tomato diseases: Good luck!


By henry (Guest Post)
June 28, 20080 found this helpful
Best Answer

You may have blight- caused by a fungus in the air. it likes damp warm condition and was bad last year, it is the same a potato blight and could have caught it from nearby potatoes?
Burn all the dead leaves etc. I changed my soil for this year - hope it goes OK.

Reply Was this helpful? Yes
By McMillan968 (Guest Post)
July 7, 20080 found this helpful
Best Answer

I lost some last year from the overly wet weather! (FLOODS) I took off ALL the leaves EXCEPT the very top and they lived.

Reply Was this helpful? Yes
Answer this Question

July 17, 2011

I potted a tomato plant in a white bucket and filled it with soil a little over half full and put it on the porch as we live on the second floor on a busy street. I noticed the plant itself was turning a dark color. I gave it some Miracle Gro and the bottom leaves on the plant went yellow so I took those off. Now the rest of the plant has turned just about all black. There are 2 tomato's growing at the top and they are getting big. What is the plant lacking?

By Gail B


July 20, 20110 found this helpful
Best Answer

I would say drainage problem and not enough soil.

Reply Was this helpful? Yes
Answer this Question

May 20, 2019

I just put tomato plants outside in grow bags and now I've noticed the top leaves of the plants starting to go black.


Gold Post Medal for All Time! 677 Posts
May 20, 20190 found this helpful

It sounds like a fungus. Perhaps they got too much water.

Reply Was this helpful? Yes
Answer this Question

May 23, 2011

My tomatoes leaves are turning black underneath. What causes this? They are blooming at this time.

By Ray

Answer this Question


ThriftyFun is one of the longest running frugal living communities on the Internet. These are archives of older discussions.

June 26, 2008

I have a tomato plant in a large container, and it has 4 small tomatoes on it. Yesterday I noticed that the leaves were turning black as if the plant had been scorched on the edges.


What could be causing this?

Comment Was this helpful? 1
In This Page
Home and Garden Gardening VegetablesMarch 21, 2018
Halloween Ideas!
Thanksgiving Ideas!
Ask a Question
Share a Post
Better LivingBudget & FinanceBusiness and LegalComputersConsumer AdviceCoronavirusCraftsEducationEntertainmentFood and RecipesHealth & BeautyHolidays and PartiesHome and GardenMake Your OwnOrganizingParentingPetsPhotosTravel and RecreationWeddings
Published by ThriftyFun.
Desktop Page | View Mobile
Disclaimer | Privacy Policy | Contact Us
Generated 2022-10-24 17:10:16 in 5 secs. ⛅️️
© 1997-2022 by Cumuli, Inc. All Rights Reserved.