In cedar-apple rust, what symptoms are seen on rose family hosts?

In cedar-apple rust, what symptoms are seen on rose family hosts?

• A. Leaf spot and deformed fruits, petioles and stem galls
• B. Fruit rot only
• C. No symptoms on leaves
• D. Root galls on roots

Answer: (A)

Cedar-apple rust on rose-family hosts shows distinctive foliar and growth symptoms, not just fruit or root issues. When the rust infects apples, crabapples, and similar hosts, you typically see yellow to orange leaf spots on the upper surface, with a corresponding spore mass on the underside. As the disease progresses, leaves can become distorted or drop early, and the fruit may develop corky, deformed spots. In addition, the infection can cause galls to form on the petioles and stems, leading to swollen or distorted growth. These combined symptoms—leaf spots, deformed fruit, and petiole/stem galls—are characteristic of cedar-apple rust on rose-family hosts. The other options don’t fit because they ignore the leaf symptoms and stem/petiolar galls, or they imply root involvement or only fruit rot, which isn’t typical for this rust on these hosts.

Cedar-apple rust on rose-family hosts shows distinctive foliar and growth symptoms, not just fruit or root issues. When the rust infects apples, crabapples, and similar hosts, you typically see yellow to orange leaf spots on the upper surface, with a corresponding spore mass on the underside. As the disease progresses, leaves can become distorted or drop early, and the fruit may develop corky, deformed spots. In addition, the infection can cause galls to form on the petioles and stems, leading to swollen or distorted growth. These combined symptoms—leaf spots, deformed fruit, and petiole/stem galls—are characteristic of cedar-apple rust on rose-family hosts. The other options don’t fit because they ignore the leaf symptoms and stem/petiolar galls, or they imply root involvement or only fruit rot, which isn’t typical for this rust on these hosts.