Sapota Leaf Webber

📖 Description

Sapota Leaf Webber (Nephopteryx eugraphella) is the most important pest of sapota (chiku) across the Indian subcontinent, particularly severe in the major sapota-growing belts of Gujarat (Bhavnagar, Navsari, Valsad — India’s largest sapota-producing state), Maharashtra (Dhule, Nandurbar), Tamil Nadu (Dindigul, Theni), Karnataka (Kolar, Chikkaballapur) and Andhra Pradesh where India is the world’s largest producer of sapota (over 60,000 hectares cultivated). The pest is particularly damaging because (a) the caterpillars web together terminal leaves with silk, creating a protective shelter where they feed safely on the leaves inside — contact insecticides cannot reach the caterpillars inside the web, (b) infested shoot tips dry up and die, causing the tree to produce multiple weak side shoots instead of strong vertical growth, (c) reduced photosynthetic area from defoliation affects fruit development and quality, (d) the pest has multiple overlapping generations per year (8-10 in tropical India), allowing rapid buildup from undetectable to damaging levels, and (e) the webbed shoots become entry points for secondary leaf-spot fungi (Phomopsis, Pestalotia) that cause further defoliation. The pest is most severe in monocropped sapota orchards and in over-fertilized trees with lush tender growth. IPM with winter pruning to reduce carryover population, pheromone trap monitoring, weekly hand-picking of webbed leaves (the single most effective organic control), Bt sprays during peak adult flight, Trichogramma egg parasitoid releases, and need-based insecticide rotation provides effective and sustainable control. The pest is a particular concern for smallholder sapota farmers (the dominant production system in India) because the crop provides year-round income through fruit sales, and even moderate infestations can reduce fruit yield and quality enough to significantly affect household income.