Concept:Coffee plants are mainly affected by fungal diseases that target their leaves and reduce yield.
Explanation:Coffee rust, caused by
Hemileia vastatrix, is one of the most serious coffee diseases.
It produces yellow-orange powdery spots on the underside of leaves.
Leaf spot is another fungal infection that damages coffee foliage and lowers plant health.
In contrast, mosaic disease is commonly seen in crops like cassava.
Smut disease typically attacks cereal crops such as maize and sorghum.
Therefore, among the pairs listed, only rust and leaf spot are diseases that attack coffee.
Answer:D. Rust and leaf spot