PEST OF GINGER :: MAJOR PESTS :: RHIZOME MAGGOT

4. Rhizome maggot: Formosina flavipes, Chalcidomyia atricornis (Chloropidae: Diptera), Eumerus albifrons (Syrphidae: Diptera), Mimegralla coeruleifrons (Micropezidae: Diptera), Calobata sp (Micropezidae: Diptera), Celyphus sp (Celyphidae: Diptera)    
Distribution and status  
Formosina flavipes, Chalcidomyia atricornis -  Found on turmeric and ginger in South India
Eumerus albifrons, Mimegralla coeruleifrons - Found on ginger in Karantaka
Celyplius sp – Found on ginger in Kerala and Uttar Pradesh
Host range: Turmeric and ginger
Damage symptoms
Rhizomes and roots are tunneled extensively by the maggots resulting in rotting of rhizomes.
Management:  

• Avoid using seed material from the infested fields.
• Spray methyl parathion 50 EC or dimethoate 500 ml in 500 -750 L water per ha
• Soak seed rhizomes, in insecticide solution of either dimethoate 30 EC or phosalone 1.5 ml/L or monocrotophos 36 WSC 1.5 ml/L or dichlorvos 0.5 ml/L for 15 min. for storing