Red flat mite

Systematic position. Brevipalpus yothersi belongs to the class Arachnida, order Trombidiformes, and family Tenuipalpidae. These mites are commonly known as false spider mites because, unlike true spider mites, they do not produce silken webs and possess a characteristic flattened, reddish body, allowing them to remain hidden in narrow leaf crevices.

Host plants. This species is a major pest with a wide host range, primarily affecting citrus orchards. Beyond citrus, it causes significant damage to tea, coffee, grapevines, and various ornamental plants. Its ability to feed on diverse hosts makes it a difficult pest to control in complex agricultural landscapes where different crops grow in proximity.

Biology and life cycle. The development of Brevipalpus yothersi occurs through the egg, larva, protonymph, deutonymph, and adult stages. The duration of the life cycle is highly dependent on ambient temperature and relative humidity. These mites thrive in warm environments, and they are typically found on the undersides of leaves, along the midribs, or on the stems, where they maintain a low profile.

Damage and economic impact. The primary injury results from the mite's feeding activity, which drains plant sap and introduces toxins that cause localized cell death and scarring. Beyond direct feeding damage, the species is recognized as the principal vector for the citrus leprosis virus (CiLV). This virus can cause severe leaf drop, fruit lesions, and eventually the death of entire trees if not properly managed.

Management strategies. Effective control requires an integrated pest management (IPM) approach:

• Routine scouting to identify infestation levels before economic thresholds are reached.
• Application of selective acaricides to reduce mite populations while sparing beneficial insects.
• Sanitation practices, including the removal and destruction of infected plant debris.
• Use of biological control agents, such as predatory phytoseiid mites.
• Strict adherence to quarantine measures to prevent the spread of the mite and associated viruses.