Agriculture: Citrus Pest Management Guidelines

Fall

This year-round IPM program covers major pests of citrus grown in California's Central Valley.

About Fall (October through December)

  • Special issues of concern related to environmental quality: Drift, runoff, and volatile organic compounds (VOCs).

What should you be doing during this time?

Monitor California red scale males using pheromone-baited sticky traps (March through October), plus additional methods (e.g. examine harvested fruit).

Monitor fruit for scale infestation and percentage red scale parasitism by Aphytis melinus and Comperiella bifasciata (August though October).

Release Aphytis melinus if biological control is compatible with the overall management program.

Monitor (November through March, depending on the date of harvest) for bean thrips in navel oranges, mandarins, and other export citrus that may be exported to Australia.

  • Check with the California Citrus Quality Council (CCQC) for current export protocols and requirements.
  • If trapping, distinguish bean thrips from other thrips species caught in sticky traps.

Look for Asian citrus psyllids on new flush if available and by using sweep sampling. Manage according to the Pest Management Guidelines.

Look for citrus leafminer (June through November) in young citrus orchards (less than 5 years). Manage if needed according to the Pest Management Guidelines.

Continue treatments in orchards with fruit destined for Korea:

  • Trees must be skirt-pruned and maintained sufficiently to prevent tree skirts from contacting the ground from June until harvest.
  • Weed control must be practiced sufficiently to prevent a bridge forming from the ground to the skirt from June until harvest.
  • Determine current protocols for managing Fuller rose beetle in accordance with Pest Management Guidelines.

Maintain records of the above in case they are needed by the packinghouse or APHIS.

Look for aggregations of leaffooted bug and manage their populations if they are damaging havestabale citrus fruit.

Look for other pests and their damage to fruit or damage to leaves and twigs, especially:

Manage if needed according to the Pest Management Guidelines.

Look for diseases that cause symptoms on fruit, leaves and twigs, and on limbs, trunks, and roots, especially:

Record the date and location of problem trees or sites. Manage if needed according to the Pest Management Guidelines.

Survey weeds. Manage vegetation if needed according to the Pest Management Guidelines.

Determine whether a preventive application of certain materials are warranted, including:

  • Fruit rot, rind disorder, and twig blight (bacterial blast) protectants for diseases listed above.
  • Plant growth regulator to reduce fruit drop.
  • Whitewash to preserve fruit quality and to reduce fruit drop and sunburn (new plantings).

Apply if needed according to the Pest Management Guidelines.

Provide proper cultural care and good growing conditions, including:

  • Sample leaf nutrient levels at least once mid-August through October.
  • Fertilize if needed.
  • Irrigate and adjust scheduling to meet trees' varying water needs.
  • Provide frost protection (PDF) when cold threatens.

Harvest mature fruit in coordination with other management activities to ensure good postharvest fruit quality and food safety.

  • Educate and supervise workers regarding fruit-handling Best Management Practices (BMPs)
  • Inspect fruit quality before bins are moved from the picking site to identify grove areas where management practices need improvement.
Text Updated: 01/19