Tea looper

Ectropis bhurmitra, commonly known as the tea looper, is a significant defoliating pest belonging to the family Geometridae (order Lepidoptera). It is widely recognized by agronomists as a primary threat to commercial tea plantations, particularly in South and Southeast Asia, due to its voracious appetite and high reproductive capacity.

While the tea plant (Camellia sinensis) is its preferred host, the looper is a polyphagous insect. It has been documented attacking various other crops, including cacao, coffee, and diverse garden plants. This broad host range allows the pest to survive and maintain populations even when primary host densities are fluctuating.

The life cycle of the tea looper consists of four distinct stages: egg, larva, pupa, and adult moth. The larvae, commonly called "loopers" due to their characteristic movement, possess cryptic coloration that provides excellent camouflage against tea branches. Depending on environmental temperature and humidity, the development from egg to adult takes approximately one month.

The economic damage is caused primarily by the larval stage. Young larvae feed on tender leaves, while older instars consume mature leaves, often leaving only the midribs behind. This extensive defoliation forces the plant to divert energy from production to recovery, leading to reduced leaf flushing and a long-term decline in plantation yield.

Effective management requires a combination of cultural, biological, and chemical control methods. Key strategies include:

• Regular field monitoring using light traps to track moth activity.
• Conservation and release of natural parasitoids and predators.
• Targeted use of Bacillus thuringiensis-based microbial pesticides.
• Judicious application of selective insecticides when infestation thresholds are exceeded.