Topics in Subtropics

Critical Leaf Nutrient Thresholds to Diagnose Deficiencies in HLB Trees By Arnold Schumann, Laura Waldo, Tripti Vashisth, Alan Wright and Kelly Morgan Huanglongbing (HLB) disease severely impacts the nutrient status of citrus trees, particularly by stunting the feeder roots and causing measurable de...

There has been a good overall discussion of herbicide resistance found in plants and how they can affect orchard management. Check out this presentation by UC Cooperative Extension Weedologist, Brad Hanson, in the "past Webinars" section: https://ucanr.

Growers of one of Florida's signature citrus crops, the grapefruit, may see more production and possibly less of the deadly citrus greening disease.

Here's an example of the kind of information that can be both exciting and disappointing - forecasts of the future of the citrus and avocado industries and many other fruit and nut crops. The latest forecasts are available form the USDA - Economic Research Service: https://www.ers.usda.

Reflections on Water People and Trees Coastal California is a hard environment to decide when to irrigate. Fog and rain vary from season to season and day to day. Depending on the proximity to the coast and elevation, average rainfall in Ventura is about 18 inches.