Tropical & Subtropical Fruits

When to plant: March–April (after last frost date) Harvest window: Varies widely depending on variety Fertilization: Nitrogen throughout the growing season; iron, zinc, and other nutrients may be needed Train young trees to promote lateral growth.

When to plant: Citrus can be planted almost any time of year. The best time is after the last frost in spring (mid-March) Harvest window: Year-round, depending on variety Fertilization: Nitrogen in January, again in May/June timeframe. Monitor for zinc, iron, and other micronutrient deficiencies and…

Integrated Pest Management (IPM) UC IPM website What is IPM? An ecosystem-based process for solving pest problems while minimizing risks to people and the environment. What is a pest? An unwanted organism that damages or interferes with desirable plants.

Understanding citrus leafminer: Learn why this common pest causes cosmetic damage but doesn't harm your citrus trees.

Program OverviewThe Plant Pathology Program provides applied research and outreach to support agricultural production across Imperial, Riverside, and San Diego counties. This tri-county region encompasses a wide diversity of crops and growing conditions—from the desert-irrigated systems of Imperial Valley to…

Citrus are attractive, long-lived evergreen plants that require sun and warmth to produce flavorful fruits. Choose the sunniest, warmest location available. A southwestern exposure or a location that receives reflective warmth (from a surface such as a driveway, patio, wall, or pool) would be excellent.

Current Quarantines: A Mediterranean Fruit Fly quarantine is in effect for large parts of San Jose, as well as sections of Campbell, Los Gatos, Santa Clara, and Milpitas. Asian citrus psyllid (ACP) County-wide quarantine on citrus fruits, leaves, and trees; also Indian curry leaf and other hosts The Asian…