Yellow Leaves in Hydroponics: Nutrient Deficiency, Not Disease

Chlorosis Explained

"Yellow leaf" in hydroponics is usually chlorosis from mineral shortage (N, Fe, Mg, K, Ca), not a pathogen. Compare to soil-grown controls—if they're green, it's not a contagious disease.

Check Nutrient Solution

Verify your solution supplies adequate nitrogen, iron, magnesium. These are critical for green color. Adjust concentration or switch to a complete hydroponic formula.

If Nutrients Are Adequate

Then consider root pathogens (nematodes) or viruses, but these are rare in clean hydroponics. Start with the solution analysis.