Yes, Plumeria can suffer from molybdenum (Mo) deficiency, although it is relatively rare compared to other nutrient deficiencies. Molybdenum plays a crucial role in various biochemical processes in plants, such as nitrogen metabolism. It helps in the conversion of nitrates to amino acids within the plant, which are the building blocks of proteins. A deficiency in this trace element can lead to an array of symptoms and overall poor plant health.

Symptoms of Molybdenum Deficiency in Plumeria:

1. Older Leaf Symptoms: Unlike some deficiencies that affect new leaves, molybdenum deficiency often starts in older leaves.
2. Leaf Discoloration: Older leaves may turn pale green or yellow and, in severe cases, may even become orange-tinged.
3. Leaf Curling or Cupping: The older leaves may start to curl upwards, or their edges may turn under, displaying a cupped appearance.
4. Interveinal Chlorosis: You may observe a yellowing between the veins of older leaves, while the veins themselves may remain green.
5. Reduced Flowering: Since molybdenum plays a role in the plant’s reproductive processes, a deficiency could lead to fewer flowers and poor fruit set, if applicable.
6. Stunted Growth: In severe cases, you might notice an overall stunting of the plant.

Causes of Molybdenum Deficiency:

1. Soil Deficiency: Some soils are naturally low in molybdenum.
2. Acidic Soil: Molybdenum availability decreases in acidic conditions. Aim for a slightly acidic to neutral pH for optimal nutrient absorption.
3. Poor Drainage: Overwatering or poor drainage can also impact the plant’s ability to uptake molybdenum.

Management and Treatment:

1. Soil Testing: Conduct a soil test to determine if molybdenum levels are indeed low. This will also help you gauge the levels of other nutrients and the soil’s pH.
2. Fertilizer Application: If a deficiency is confirmed, you can apply a molybdenum-specific fertilizer or a balanced fertilizer that includes trace elements like molybdenum.
3. pH Adjustment: If the soil is overly acidic, consider applying lime to raise the pH to a more neutral level, enhancing molybdenum availability.
4. Improve Drainage: If poor drainage is suspected, repot the plant in well-draining soil or improve soil structure by adding organic matter.

By understanding the symptoms, causes, and treatments for molybdenum deficiency, you can take effective steps to rectify the issue and maintain your Plumeria’s overall health. For more information on nutrient deficiencies in Plumeria, you may refer to resources like PlumeriaCareGuide.com.