As we approach the end of February 2025, greenhouse tomato growers should be on high alert for a microscopic menace that can wreak havoc on their crops: the tomato russet mite (Aculops lycopersici). These minuscule pests, barely visible to the naked eye at just 0.17 mm in length, can quickly lead to severe plant damage if not addressed promptly. Despite their size, the impact of russet mites on greenhouse tomatoes can be substantial, making early detection and effective management crucial for maintaining healthy, productive plants.
The symptoms of a russet mite infestation often begin subtly but can escalate rapidly. Initially, growers may notice browning on the stems near the substrate, often accompanied by a slight curling of leaves and a silvery sheen on their undersides. As the infestation progresses, a characteristic bronzing or "russeting" appears on stems, leaves, and fruits. Leaves may yellow and curl, eventually turning brown and brittle, while losing their trichomes. The damage typically moves upward as mites migrate to higher parts of the plant. In severe instances, stems can turn a rusty brown color and may even break under severe stress. Fruits aren't spared either, often developing a coarse skin with a reddish-brown hue and possible deformities. Overall plant vigor, health, and flower production can be significantly reduced as the infestation progresses.
To combat russet mites effectively, greenhouse tomato growers should implement an integrated pest management (IPM) approach. Biological control methods, such as introducing predatory mites like Transeius montdorensis or Amblyseius swirskii, can be highly effective.
Read more at EGro Blog