Does Epsom salt help tomato leaf curl?
Written by
Kiana Okafor
Reviewed by
Prof. Charles Hartman, Ph.D.Epsom salt only benefits tomato leaf curl from a magnesium deficiency, rather than a virus. Using it when the problem is a virus slows proper control of the virus. Use Epsom salt only when low magnesium levels are confirmed by soil testing and the yellowing patterns appear between the veins on older foliage.
Appropriate Uses
- Magnesium deficiency: Corrects yellowing between veins on mature leaves
- Seed germination: Improves germination rates when added to starter mix
- Stress recovery: Enhances chlorophyll production after transplant shock
Ineffective Cases
- Viral infections: No impact on tomato leaf curl virus progression
- Other deficiencies: Won't correct potassium or calcium shortages
- Environmental stress: Doesn't resolve heat or water-related curling
Proper Application
- Soil testing: Confirm deficiency before use target below 50 ppm magnesium
- Dosage control: Apply 1 tablespoon per gallon every two weeks maximum
- Timing: Use early morning or late evening to prevent leaf burn
Symptoms of magnesium deficiency are clearly different than viral curl. Look for yellow (inter-veinal) yellowing on older leaves, not new growth. The curling is downward, not upward, and they do not show stunting or brittle leaves. If you add Epsom salt for magnesium, there is an easy and definitive soil test to determine its effectiveness before use.
Correctly applying Epsom salt can help prevent issues and symptoms. Too much Epsom salt can build up in the soil causing salt damage to roots. Follow mixing instructions: Use one tablespoon of Epsom salt to one gallon of water for foliar or soil drench. Apply product every 2 weeks or until symptoms improve. Once leaves return to normal green foliage color and texture, discontinue application.
It is important to properly diagnose before proposing treatment. Viral curl will not resolve with Epsom salt and consequently will delay critical removal. Annual soil testing will help maintain your nutrient balance. I only break out Epsom salt when verified deficiencies exist, and to keep plants healthy without resorting to inefficient treatments.
Read the full article: Tomato Leaf Curl Virus: Complete Guide
