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Symptom of attack of Whitebacked planthopper:
1. Heavy infestation cause outer leaves of a hill to show burn symptoms.
2. Damage in the form of hopperburn appears uniformly in a rice field, whereas it appears as circular patches in the case of BPH.
Nature of damage of Whitebacked planthopper:
1. WBPH is more abundant during the early stage of the growth of rice crop, especially in nurseries. Damage is caused through feeding and oviposition.
2. Gravid females cause ovipositional punctures in leaf sheaths. Both nymphs and adults suck phloem sap causing reduced vigour, stunting, yellowing of leaves and delayed tillering and grain formation.
3. Feeding puncture and lacerations caused by ovipositor predispose the plants to pathogenic organisms and honeydew excretion encourages the growth of sooty mould. It is not a vector of any viral disease.