Citrus Pest Management Guidelines
UC agricultural management guidelines for control of citrus pests. Mandatory Intervals Between Application, Reentry, and Harvest, and Hazards to Bees (9/08) Citrus Weed Photo Gallery, with Common and Scientific Names (9/08) Integrated Pest ... [... more]
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Pathogens: Citrus psorosis ophiovirus
Infected trees, mostly orange and grapefruit, slowly decline; main scaffold branches die and trees become unproductive. The most distinguishing field symptom is scaling and flaking of the bark on the scion. Symptoms, including interveinal yellow ... [... more]
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Purple Scale
Purple scale is one of the armored scales. The cover of the adult female purple scale resembles a mussel shell in shape. The immature male cover is shorter and much narrower than the female cover. Mature males are winged insects that search out ... [... more]
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Stubborn Disease
Stubborn disease is endemic in the warm inland growing areas, where it affects primarily sweet orange, grapefruit, and tangelo trees. The disease is more of a problem in young orchards than in mature groves. The pathogen is a phytoplasma, which ... [... more]
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Citricola Scale
Citricola scale is a soft scale. Crawlers of the citricola scale appear from June through August. They settle primarily on the underside of leaves, but in severe infestations they also settle on the upper leaf surface and on twigs, rarely on ... [... more]
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Broad Mite
Broad mites are often found in depressions on fruit where the females lay their eggs, which are dimpled, translucent, and covered in white speckles. These mites are so small you need a hand lens to see them. Broad mites are yellowish in color and ... [... more]
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Septoria Spot
Early symptoms of Septoria spot appear as small, light tan to reddish brown pits on fruit, 0.04 to 0.08 inch (1 to 2 mm) in diameter, which usually do not extend beyond the oil-bearing tissue. Advanced lesions are blackish, sunken, extend into ... [... more]
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Scientific Name: Heliothrips haemorrhoidalis
Adult greenhouse thrips are tiny, black insects with whitish to translucent wings folded back over their thorax and abdomen. Legs are also a whitish color. This species is parthenogenic (i.e., reproduces without mating), and males are rarely ... [... more]
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Citrus Rust Mite (Silver Mite)
UC Management Guidelines for Citrus Rust Mite (Silver Mite) on Citrus. This pest is known as the rust mite on oranges and the silver mite on lemons. It is an occasional pest in coastal areas of southern California and is a problem in some years ... [... more]
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Citrus Red Mite
Adult female citrus red mites are oval and globular; the male is smaller and has a tapered abdomen. Each female lays 20 to 50 eggs at a rate of 2 to 3 a day, depositing them on both sides of leaves. The life cycle from egg to egg may be as short ... [... more]
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Glassy-Winged Sharpshooter
UC Management Guidelines for Glassy-winged Sharpshooter on Citrus. Glassy-winged sharpshooter is in the same insect family as leafhoppers (Cicadellidae). The glassy-winged sharpshooter feeds, reproduces, and is often abundant on a variety of host ... [... more]
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Pathogen: Alternaria citri
Alternaria rot is a fungal disease that affects mainly navel oranges and lemons. Fruit infected with Alternaria change color prematurely. The decay is softer on lemons than on oranges. Infections typically occur in the grove; disease often ... [... more]
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