Early shoot borer: Chilo infuscatellus |
Symptoms of damage:
- Dead heart in 1-3 months old crop, which can be easily pulled out
- Rotten portion of the straw coloured dead heart emits an offensive odour
- Bore holes at the base just above the ground level
Identification of the pest:
- Larva: Five dark violet stripes and dark brown head
- Adult: Pale greyish brown moth with white hind wings
Management:
ETL: 15 % dead heart
- Early season planting (Dec-Jan)
- Trash mulching on ridges on 3 days after planting (DAP)
- Intercropping with green gram, black gram, daincha effectively checks shoot borer
- Spray Granulosis virus at 1.5 x 1012 POB/ha twice on 35 and 50 DAP or release 125 gravid females of Sturmiopsis inferens /ha on 30 and 45 DAP
- Apply the following insecticides
Soil application
- Spraying any one of the following
- Chlorantraniliprole 18.5% SC 375 ml/ha
- Fipronil 5% SC 1500-2000 ml/ha
- Fipronil 0.3% GR 25-33.3 Kg/ha
- Quinalphos 25% EC 2000 ml/ha
- Phosalone 35 EC 1000 ml
- NSKE 5 % 25 Kg/ha
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| Note: The virus should be applied with teepol (0.05%) during evening hours. The granular application should be immediately followed by irrigation. ‘Granulosis’ virus spraying on sugarcane at 750 Nos. of diseased larvae, crushed and filtered mixed in 500 l of water has been found harmless to parasitoids and predators. A
sticker like ‘teepol’ (250 ml for 500 l) can also be added to make the solution stick on to surface of the crop and it is preferable to use high volume sprayer to be more effective. On cost benefit ratio basis NSKE 5% is recommended. |
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