Pepper Pollu Beetle

📖 Description

Pepper Pollu Beetle (Longitarsus nigripennis), also called Pepper Flea Beetle or Pollu Beetle (the name ‘pollu’ means hollow in Malayalam, referring to the hollowed-out berries), is the most destructive pest of black pepper across the Indian subcontinent, particularly severe in the major pepper-growing belts of Kerala (Kozhikode, Kannur, Kasaragod, Wayanad, Idukki — India’s largest pepper-producing state), Karnataka (Kodagu, Chikkamagaluru, Dakshina Kannada) and Tamil Nadu (Nilgiris, Kanyakumari) where India is the world’s largest producer of black pepper (over 130,000 hectares cultivated). The pest is particularly damaging because (a) the larvae mine inside the pepper berries — the most valuable plant part for pepper cultivation, (b) infested berries become hollow, light in weight and develop a characteristic dark discoloration (the ‘pollu’ symptom), making them completely unsuitable for spice production, (c) the pest preferentially attacks berries at the early formation stage — exactly when they are most valuable, (d) the pest has multiple overlapping generations per year (5-6 in tropical India), allowing rapid buildup during the fruiting season, and (e) once a larva enters the berry, no insecticide can reach it — control must focus on preventing egg-laying on the berries. The pest is most severe in monocropped pepper plantations and in plantations with poor sanitation (where fallen berries accumulate). IPM with weekly collection and destruction of fallen berries (the single most effective control — kills larvae and pupae inside and breaks the lifecycle), yellow sticky trap monitoring of adults (which jump actively and are attracted to yellow), neem-based sprays on berry clusters, Beauveria bassiana sprays (effective against both adults and larvae), soil drenches of Metarhizium (targets pupating larvae), berry bagging for high-value vines, and need-based systemic insecticide rotation provides effective and sustainable control. The pest is a particular concern for export-oriented pepper growers (India is a major exporter of black pepper to USA, EU and other markets) because even a small percentage of pollu-affected berries in a consignment can lead to rejection or severe price downgrading.