What does chlorosis in a tree refer to?

Chlorosis in a tree refers to the yellowing of leaves due to insufficient chlorophyll production. This condition typically arises from various factors, including nutrient deficiencies (particularly nitrogen, iron, or magnesium), poor soil drainage, or root damage. The yellowing indicates that the tree is unable to effectively produce the green pigment necessary for photosynthesis, which can significantly impact its health and growth.

Recognizing chlorosis is crucial for diagnosing tree health issues early and determining the appropriate remedial actions, such as soil amendment or proper fertilization, to restore the tree's vibrant green color and overall vitality. The other options—root decay, fruit overdevelopment, and stem weakness—do not specifically pertain to leaf color changes or the process associated with chlorophyll production, which are central to the definition of chlorosis.