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Microsprinkler irrigationMonitor and Manage Irrigation

The appropriate amount, frequency, and method of irrigation and applying high quality water are critical for improving tree health and fruit yield. Proper irrigation prevents and manages many diseases and disorders and reduces problems with weeds and certain invertebrates.

Inspect and test irrigation systems periodically, at least annually by late winter.

  • Test irrigation water quality at least annually, typically during spring. Tests include analyses of alkalinity, overall salinity, and any specific ions that may be of concern, and nitrogen in irrigation water that should be credited toward the fertilization rate.
  • Evaluate and monitor irrigation need using accurate methods, such as evapotranspiration, tensiometers, or a combination of recommended methods.
  • Adjust irrigation schedule (application frequency and rates) to meet trees’ varying need. Use irrigation scheduling tools such as those online at www.ucavo.ucr.edu and www.avocadosource.com.
  • Make sure different size trees have separate irrigation systems. For example, do not water young trees the same as mature trees.
  • Apply sufficient, good-quality water. Excess salinity is a common problem that damages trees and reduces yield.
  • Avoid runoff, wetting of trunks, and waterlogging of root zones.

Important links

Statewide IPM Program, Agriculture and Natural Resources, University of California
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