Topics in Subtropics

Effective September 11, 2026, the Department is expanding the citrus greening disease boundary in the Murrieta area of Riverside County and into San Diego County (grids 484, 499, and 510). A map of the expanded boundary can be found at https://www.cdfa.ca.gov/citrus/pests_diseases/hlb/regulation.html.

Corsica was posed with competition for its Clementine fruit from outside sources and found a way to regulate a certain quality for its sale that made it more competitive for their fruit.

Calculating the amount of nutrients removed in a crop of avocados.

Avocado leaf analysis is an important guide to nutrient management, along with good irrigation management and correct soil pH.

Leaf analysis is what guides perennial crop fertilization. It's a better guide than soil analysis which mainly indicates soil problems and reflects irrigation management. It's critical for measuring soil pH which is probably the most important chemical property of soils.