Scouting Citrus for Pests - Page 13

Scouting for Spider Mites

• Follow CRM sample pattern

  • Increase for lower threshold

• 4 leaves per tree

• Threshold 5-10/leaf, depending on :

• Population trends

  • Predominantly males

  • Nymphs and females

• Weather

• Tree Condition

When scouting for spider mites, a similar pattern can be followed as for CRM, although action threshold levels for both pests will determine how many samples need be taken for a given level of accuracy. At each stop, sample one leaf from each quadrant of the tree. The threshold of 5 to 10 mites per leaf may indicate the need to treat. Population trends can help decide what threshold to use. A predominance of younger stages and females indicates an expanding population, while a predominance of males indicates a declining population and should probably not be sprayed. Imminent rainy weather might foretell a population decline, while stressed trees would be more susceptible to firing.

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