Rice Hispa
Dicladispa armigera
📖 Description
Rice Hispa is a serious defoliator of rice across the Indian subcontinent, particularly in eastern India, Bangladesh, and parts of Southeast Asia. Adult beetles scrape the green tissue from leaves, leaving characteristic white feeding scars parallel to the veins. Larvae mine between the upper and lower leaf epidermis, creating transparent blotches that reduce photosynthesis. Heavy infestation can completely defoliate rice plants, causing significant yield loss. The pest is most damaging in over-fertilized crops with excessive nitrogen, where tender leaves support rapid population buildup. Handpicking adult beetles from young crops, combined with field drainage and judicious insecticide use, can effectively manage outbreaks.
⚠️ Symptoms to watch for
- White feeding scars on leaves from adult beetles scraping tissue
- leaf mines (transparent patches) from larval feeding
- withered leaves
- reduced photosynthesis
- stunted plants in heavy infestation
- yield loss 20-50%
🩹 Treatment
- Handpick adult beetles and egg masses
- apply neem oil 5ml/L
- use recommended insecticides at early infestation
- set up light traps @ 1/ha
- drain field to suppress larvae
🌿 Organic treatments
- Handpick adult beetles and egg masses from leaves
- apply neem oil 5 ml/L
- drain field water to suppress larval development
- apply 5% NSKE
- set up light traps @ 1/ha
- apply Beauveria bassiana @ 5 g/L
- push-pull strategy with trap crops
🧪 Chemical treatments
- Chlorantraniliprole 18.5 SC @ 0.3 ml/L
- Cartap hydrochloride 50 SP @ 2 g/L
- Quinalphos 25 EC @ 1 ml/L
- Carbaryl 50 WP @ 2 g/L
- Lambda-cyhalothrin 5 EC @ 1 ml/L
🛡️ Prevention
- Inspect nurseries and remove infested seedlings
- handpick adult beetles from young crops
- avoid excessive nitrogen
- control grassy weeds
- drain field water periodically
- conserve predatory bugs and spiders
- use light traps during adult activity
- plant resistant varieties where available
🪴 Affected plants
- Rice
- Wild Rice
- Some Grasses (Poaceae)
🦋 Natural predators
- Spiders
- Predatory Bugs
- Ladybird Beetles
- Frogs
- Birds
🌱 Host plants
- Oryza sativa
- Oryza rufipogon
- Echinochloa spp.
- Leersia hexandra
🔄 Lifecycle
- Female lays 30-100 eggs singly inside leaf tissue.
- Eggs hatch in 4-7 days.
- Larvae mine leaves for 7-14 days, passing through 4 instars.
- Pupation occurs inside the leaf mine, lasting 5-7 days.
- Adults live 15-30 days.
- Total life cycle 20-30 days; 5-7 overlapping generations per year.
📅 Season
- Active Jun-Nov during Kharif rice, peak at 30-50 days after transplanting
🔎 Appearance
- Small, rectangular, dark blue-black beetles with distinctive long spines on the thorax and wing covers.
- Larvae are flat, yellowish, and grub-like, found inside leaf mines between the upper and lower epidermis of rice leaves.
💥 Damage level
- High
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent
- Southeast Asia
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