MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST Scale of Red Scale ( aurantii), Circular black scale (Chrysomphalus aonidum), Cottony cushion Scale - purchasi Suntala jat falful ko katle kira Prevention Monitoring Direct Control Direct Control Restrictions

l Select seedlings l Monitor field weekly to check for the presence of scale l Conserve natural predators such as l Spray l Use personnel free from scale on five randomly selected green twigs and 5-10 leaves ladybirds and Green lacewings by Dimethoate 30% protection . per twig and five randomly selected fruit per tree. Select planting attractive flowering plants on EC @ 1.5 ml / equipments (PPE) l Follow sanitation 5 trees from one hectare. the ridge or border of orchard. litre water 3 while using measures- prune l Observe honeydew (a sugary substance) secreted by l Spray petroleum (horticultural) oil @ times (April, chemical annually. scales. Black coloured sooty mould (a fungus) grows 10 ml per litre water 3 times (April, August/ pesticides. September and Dimethoate: WHO l Follow regular on the honeydew coating leaves, twigs and fruit. August/ September and November/ December). or November/ II (moderately removal and l Observe the defoliation of trees and dead twigs for the December). hazardous). l Scales on citrus plant stem. destruction of presence of scales. Action threshold: 1-3+ red scale Spray azadirachtin 0.15% @ 5 ml /litre Dimethoate has 14 (Photo by: D. Adhikari) infested on 10% or > fruits, soft brown scale 15%, Cottony water 3 times (April, August/ days PHI. Oil branches, fallen Cushion Scale 5%. Note: Scales are highly active from September and November/December). sprays can be toxic leaves and fruits spring to autumn and less active in winter. Note: 3-5 litre of water suspension/ to trees, by burning or solution is required per citrus pant. particularly applied burying at least when trees are 30 cm deep. water stressed in hot weather

Citrus fruit infested with Red Scale. (Photo by: S.R. Adhikari)

Nepal CREATED/UPDATED: August 2015 AUTHOR(S): Shalik R. Adhikari, (PPD), Deb Raj Adhikari, (DADO) and Resham Bahadur Thapa, (TU) EDITED BY: Plantwise

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