Tetranychus truncatus

Systematic position: Tetranychus truncatus belongs to the class Arachnida, order Trombidiformes, and the family Tetranychidae. It is a well-recognized spider mite species known for its significant impact on agricultural productivity in various regions, particularly within Asian agricultural systems.

Host plants: This pest is polyphagous, meaning it feeds on a wide array of host plants. Major economic crops damaged by Tetranychus truncatus include soybeans, cucumbers, eggplants, cotton, and mulberry trees. It also thrives on various weed species, which act as secondary hosts during the off-season.

Biology and life cycle: The life cycle progresses through the egg, larva, protonymph, deutonymph, and adult stages. The mite reproduces rapidly in hot and dry environments. Adults often overwinter in soil debris or protected areas, emerging as temperatures rise to infest new growth, often completing several generations within a single growing season.

Damage and pest status: The spider mites feed on the lower surface of leaves, puncturing cells and extracting sap. This feeding activity leads to chlorosis, leaf wilting, and premature senescence. In severe infestations, the presence of dense webbing hinders photosynthesis, drastically reducing plant vigor and overall yield potential.

• Early detection through field scouting for mites and webbing on leaf undersides.
• Application of selective acaricides to manage populations without harming beneficial insects.
• Sanitation practices, including the removal of infested crop debris and host weeds.
• Maintaining optimal irrigation to reduce drought stress, which makes plants more susceptible.
• Conservation and augmentation of natural predators, such as predatory mites and ladybeetles.