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Rice Hispa

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1. Rice hispa (Dicladispa armigera) is a small blue-black beetle covered with spines. The grubs make long winding tunnels into leaves whereas adults scrape the chlorophyll.
2. The affected leaves turn whitish and membranous and ultimately dry up. Scrapping of the upper surface of the leaf blade leaving only the lower epidermis as white streaks parallel to the midrib.
3. Tunnelling of larvae through the leaftissue causes irregular translucent white patches that are parallel to the leaf veins. Damaged leaves wither off and damaged leaves turn rice fields whitish and membranous that appears burnt when severely infested.
4. Severity of the damage is related to crop growth stage of attack. The larvae move down between the leaf sheaths until they reach the apical bud or one of the lateral buds.
5. They lacerate the tissue of the bud and feed until pupation. Hispa occurs severely in Assam, Meghalaya and Tripura bordering Bangladesh. Rice hispa outbreaks were recorded in 1987 in Meghalaya and Arunachal Pradesh.
6. Spraying of Beauveria bassiana@3 g/l controls rice hispa.

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