Septoria leaf spot

Symptom

Septoria leaf spot is caused by the fungus that is dispersed  through wind and water. Small, circular lesions develop on the lower, older leaves first. Spots are typically gray to tan in the center with dark brown margins. As the disease progresses, the number of spots increases and spreads upward through the canopy. Multiple lesions may coalesce, causing larger necrotic areas. Infected leaves gradually turn yellow, then brown, and eventually wither  and drop prematurely. Defoliation typically starts from the bottom and moves upward. Severe defoliation reduces the plant's ability to photosynthesize, leading to reduced fruit size and yield. It rarely infects fruit directly but may cause minor spotting on stems or calyxes. Most severe in warm, wet, or humid conditions.