Normal Variegation Or Nutrient Deficiency

This is not an infectious disease; its either a normal variegation that shows when leaves mature, or its possibly a nutrient deficiency and/or a watering issue. Is this a houseplant called Pothos? Its hard to ID the plant from one leaf and this particular photo, but if its a pothos then the variegation is normal for this plant. If you know for certain that its not a normal variegation then it could be a nutrient deficiency and/or a watering issue. Too much or too little water can cause plant leaves to turn yellow because the roots either drown or dry out and can’t function to take in water and the mineral nutrients dissolved in the water. We would expect a much deeper yellow color with nutrient/water issues and the color in this photo appears more white than yellow. However, if you can take some of the soil in your hand and squeeze water out of it then its too wet, or if you take a handful of soil and it won’t hold together in loose ball when squeezed, then its too dry. If the soil is kept evenly moist and leaves still turn yellow, then you’ll want to fertilize. You can use a slow release fertilizer worked into the top 1-2 inches of soil (gently so as not to damage roots).