Citrus yellow mite

The citrus yellow mite (Eotetranychus kankitus) is a member of the spider mite family (Tetranychidae), order Acariformes. These mites are characterized by their small size and distinct yellowish color.

They are primarily found on the underside of leaves, where they build their colonies. Detecting them requires careful inspection or the use of a magnifying glass due to their microscopic nature.

The life cycle consists of egg, larva, protonymph, deutonymph, and adult stages. Under optimal warm conditions, the entire life cycle can be completed in about two weeks.

Humidity plays a critical role in their population dynamics. Low humidity and high temperatures significantly accelerate the rate of development and reproduction.

The mite overwinters as a fertilized female hidden in the crevices of the bark or protected areas on the host plant until temperatures rise in the spring.

Host plants include a wide range of citrus species, such as lemons, oranges, and mandarins. They are known to cause economic losses in commercial citrus orchards.

By piercing leaf cells and sucking the sap, these mites damage the chlorophyll-containing tissue. This feeding behavior results in stippling and yellowing of the foliage.

Heavy infestations cause premature leaf drop, which significantly weakens the overall vigor of the tree and reduces the energy available for fruit development.

The damage often extends to the fruit, which may show scarring or discoloration, lowering its market value. In extreme cases, fruit abscission can occur.

Continuous feeding stresses the tree, making it more susceptible to other pests and opportunistic diseases that thrive on weakened plant tissue.

Cultural control includes keeping trees healthy with proper irrigation. Well-watered trees are generally more resilient to mite population explosions compared to drought-stressed ones.

Sanitation practices such as removing infested plant debris and maintaining good orchard hygiene can help reduce the overwintering population of the mites.

When chemical intervention is necessary, specific acaricides should be used. It is vital to rotate modes of action to prevent the development of pesticide resistance.

Biological control agents, such as predatory mites (e.g., Phytoseiidae), are highly effective at suppressing populations and should be preserved in the ecosystem.

• Perform regular monitoring during dry and hot weather.
• Ensure thorough coverage of the leaf undersides during application.
• Incorporate systemic pesticides into the management plan if the infestation is severe.