Plum spider mite

The plum spider mite (Eotetranychus pruni) is a significant pest belonging to the Tetranychidae family. These tiny arachnids are known to infest a variety of fruit trees, causing substantial physiological stress to the host plants by feeding on chlorophyll-rich leaf tissues.

The primary host plants for this mite include various stone fruit species, such as plums, cherries, and apricots. While they prefer these hosts, under favorable conditions, they can also migrate to neighboring orchard crops, posing a threat to the overall health of the plantation.

The life cycle of the mite is characterized by rapid development, which is highly influenced by ambient temperature. Fertilized females hibernate in sheltered places like bark crevices. As temperatures rise in spring, they colonize the foliage, where multiple overlapping generations occur, peaking in hot, dry mid-summer months.

Mite damage manifests as chlorotic spots, often referred to as stippling, on the leaves. As the infestation progresses, leaves may turn yellow or bronze and eventually drop prematurely. This premature senescence weakens the tree, resulting in reduced vegetative growth and smaller fruit size.

Management strategies require a multi-faceted approach. Cultural practices, such as maintaining optimal irrigation to prevent tree stress and regular pruning to improve air circulation, are essential. Chemical control relies on the targeted use of acaricides when population thresholds are exceeded, ensuring minimal impact on beneficial insects.

• Monitor leaf undersides regularly during the growing season.
• Maintain tree vigor through proper fertilization and irrigation.
• Use selective acaricides to prevent population outbreaks.
• Promote biological control by protecting natural predatory mite populations.