1a.Objectives (from AD-416)
To determine the role of calcium nutrition in citrus in relations to plant growth and tolerance to citrus canker and Huanglongbing (HLB).
1b.Approach (from AD-416)
Conduct factorial experiments to isolate the effects of calcium on root and shoot growth and tolerance to citrus pathogens. Fertilizer treatments will be conducted under "clean" (i.e. no plant pathogens) in a protected-environment structure (i.e. greenhouse). Citrus trees will then be moved to the field where citrus canker and HLB are prevalent. Citrus trees will continue to receive their respective treatments in the field and will be routinely monitored for development of aforementioned citrus pathogens.
This project is related to Objective 1 of the in-house project: Gain fundamental knowledge of the plant-substrate-water-nutrient system.
The objective of this research project is to provide the cooperator with detailed information on the effects of calcium nutrition on citrus canker and citrus greening (HLB) development. Leaf tissue was sampled every three months to determine HLB infection by northern blots, and weekly scouting for the development of citrus canker.