Litchi Leaf Miner

📖 Description

The Litchi Leaf Miner (Conopomorpha litchiella) is the most important leaf-mining pest of litchi in India — and India is the world’s second-largest litchi producer after China, with ~600,000 tonnes annual production concentrated in Bihar (Muzaffarpur, Vaishali, Samastipur — the ‘litchi bowl of India’), West Bengal, Jharkhand, Tripura, Assam, Uttarakhand, and Punjab. The Muzaffarpur litchi (cv. Shahi) holds a Geographical Indication (GI) tag and is India’s most commercially valuable litchi cultivar, with annual exports to the Middle East and Europe worth ~₹200 crore. The leaf miner’s economic impact is primarily through indirect damage — it does not attack the fruit directly, but the loss of photosynthetic leaf area weakens the tree and reduces fruit size and quality. In young (1–4 year old) orchards the pest can be particularly damaging because it directly retards canopy establishment and delays the tree’s entry into commercial bearing. The pest is closely related to the litchi fruit borer (Conopomorpha sinensis), and the two species are often confused in the field — but the leaf miner’s host is exclusively the leaf, while the fruit borer attacks the developing fruit. The two species share the same flushing cycle, and management strategies for both pests are similar (timed translaminar sprays during leaf flush and fruit set). Climate change is expanding the leaf miner’s range; it is now regularly recorded from litchi orchards in Odisha and Chhattisgarh where it was historically absent.