Pink tea mite

The pink tea mite, Acaphylla theavagrans, belongs to the family Eriophyidae, order Trombidiformes. These mites are microscopic in size and cannot be seen without magnification, making early detection a significant challenge for growers.

Adult mites have a characteristic spindle-shaped body with a pinkish or brownish hue. Their body is marked with fine transverse rings, which is a classic feature of the Eriophyid family.

Their life cycle consists of egg, two nymphal stages, and adult. Due to the high temperatures found in tea-growing regions, they can complete multiple generations in a short period, leading to rapid population explosions.

Dispersal is primarily facilitated by wind, as well as mechanical transport via agricultural equipment or humans during harvesting and pruning operations on the tea estate.

These mites prefer to reside on the underside of tender tea leaves, utilizing their specialized mouthparts to pierce the epidermis and consume the cell contents of the host plant.

The primary host for Acaphylla theavagrans is the tea plant, Camellia sinensis. The pest specifically targets the most valuable parts of the plant: the youngest and tenderest buds and leaves.

By feeding on the sap, the mites damage the epidermal layer, disrupting the plant's metabolic functions and reducing the photosynthetic rate of the foliage. This causes stress to the entire tea bush.

Heavy infestation leads to a significant reduction in the quality and quantity of the tea yield. The leaves lose their turgidity and develop an unhealthy, dull appearance that renders them unsuitable for high-grade tea production.

Prolonged feeding causes the tips of the shoots to become stunted and deformed. In severe cases, the affected foliage may become necrotic, wither, and drop prematurely, severely affecting the plant's growth.

Economically, the presence of these mites in a plantation results in significant losses, as the damaged leaves cannot be processed to produce high-quality beverages, affecting the market value of the crop.

The most prominent sign of infestation is the bronzing or browning of the underside of the leaves. This discoloration is a direct result of the tissue damage caused by the feeding activities of the mite colony.

The leaves often begin to curl along the margins and lose their natural shine. They may become leathery to the touch and exhibit signs of abnormal deformation, particularly on the apical buds.

• Bronzing of the lower leaf surface
• Curling and distortion of young leaves
• Stunted growth of new terminal buds
• Necrosis along the leaf veins
• Premature leaf drop in heavily infested areas

Microscopic examination of the affected leaf surface will reveal numerous mites, their cast-off skins, and small eggs, usually concentrated near the midrib where protection is greatest.

Growers often notice the damage as a general decline in the vitality of the tea bushes, which is sometimes mistaken for drought stress or nutritional deficiencies if not carefully inspected.

Effective management begins with routine field scouting to detect mite populations before they reach economic injury levels. Early identification is key to minimizing the use of chemical interventions.

Cultural practices, such as proper pruning and canopy management, help improve airflow and reduce micro-humidity levels around the bushes, making the environment less hospitable for the mites.

Biological control methods involve the conservation and introduction of natural predators, such as phytoseiid mites, which can significantly suppress pink tea mite populations if used correctly.

If chemical control is necessary, select specific acaricides that provide effective control while remaining safe for the environment and compliant with strict safety intervals for harvesting tea.

Strict hygiene protocols, including the sterilization of pruning tools between different blocks of the plantation, help prevent the accidental spread of mites from infested areas to healthy ones.