How to Manage Pests
UC Pest Management Guidelines
Monitoring Diseases and Disease-Promoting Conditions
(Reviewed 1/07, updated 1/07)
In this Guideline:
HOW TO MONITOR
Look for conditions that favor pathogen infection and disease development, such as inadequate cultural practices and mechanical injury to plants. Especially look for, and remedy, inappropriate irrigation.
Look for signs and symptoms of disease, and record the date and location of problem trees or sites.
If a tree looks unhealthy, examine as many of plant parts as possible.
Inspect several nearby trees, which may show earlier, more characteristic or subtle symptoms. Patterns in symptoms among trees can provide clues to the cause. Do not rely on a single symptom. Compare your observations to photos of common trunk and root diseases. If cankers are present, distinguish among the causes of cankers, which include:
Send samples to a diagnostic laboratory or consult an expert to help diagnose the cause. Keep records of testing results.
Record the date and location of problem trees or sites.
Improve growing conditions, use good sanitation, and provide appropriate cultural care as the primary means of managing:
UC IPM Pest Management Guidelines:
Acknowledgment for contributions to General Horticultural Information:M. L. Arpaia, Botany and Plant Sciences, UC Riverside
M. L. Bianchi, UC Cooperative Extension, San Luis Obispo County
C. J. Lovatt, Botany and Plant Sciences, UC Riverside
P. Mauk, UC Cooperative Extension, Riverside County
G. W. Witney, California Avocado Commission, Irvine, CA
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