FOR DOWNLOAD CONTACT - eduvish24@gmail.com FINGER MILLET ROOT APHID: Root aphids Tertaneura nigriabdominalis (Sasaki) , of the order Homoptera and family Pemphigidae.The present valid name is Tetraneura nigriabdominalis (Sasaki) .These aphids assume serious pest status on ragi by sucking the juice from the roots.They suck the sap of the plant from the roots so persistently that the whole crop withered unless constantly irrigated and even then the yield was considerably reduced .Aphid remains at the base of the plant and suck the sap. The infested plants turn pale yellow and become stunted. Wilting and drying of plants in patches is the typical symptom. Black ants attend them for honeydew and their presence confirm the root aphid attack.

1. BIOECOLOGY, NATURE OF DAMAGE,
SYMPTOM OF DAMAGE AND MANAGEMENT
PRACTICES OF FINGER MILLET ROOT APHID
PRESENTED BY ,
VISHALI NS

2. INTRODUCTION
▪ Root aphids Tertaneura nigriabdominalis (Sasaki) , of the order
Homoptera and family Pemphigidae.
▪ The genus Tetreneura was erected by Hartig in 1841. It is also
know as . T. hirsuta, Rhopalosiphum avenae .
▪ The present valid name is Tetraneura nigriabdominalis (Sasaki)
▪ These aphids assume serious pest status on ragi by sucking the
juice from the roots

3. DISTRIBUTION
▪ This pest is distributed throughout the world in all ragi growing
countries.
▪ In India it occurs as endemic pest in traditional ragi growing districts
of Karnataka.
▪ It was reported to appear in large area of Hassan district during
the year 1970, which also led to a debate in the state assembly.
▪ It was also reported from Bangalore, Kolar and Tumkur districts of
Karnataka State.

4. BIOECOLOGY
▪ Generally it perpetuates by giving birth to young ones.
▪ The young produced by a Viviparous female undergo four to
five nymphal instars occupying a total of 7-9 days.
▪ The longevity of the adult in general ranges from 5 to 11 days.
▪ The root aphids are minute pinkish and globular.
▪ The average life cycle is spread over a period of 30 days .

5. ADULT

6. NATURE OF DAMAGE
▪ They suck the sap of the plant from the roots so persistantly that the
whole crop withered unless constantly irrigated and even then the
yield was considerably reduced
▪ It generally occurred in slightly moist soils.
▪ The presence of ants visiting the roots, such plants when pulled out
will show colonies of the aphids attached to the roots.

7. SYMPTOM OF DAMAGE
▪ Aphid remains at the base of the plant and suck the sap.
▪ The infested plants turn pale yellow and become stunted.
▪ Wilting and drying of plants in patches is the typical symptom.
▪ Black ants attend them for honeydew and their presence confirm
the root aphid attack
▪ Some times it causes indirect damage by transmitting plant
viruses.

8. MANAGEMENT PRACTICES
▪ Spray carbaryl 50 WP@ 1 kg/ha (500 l spray fluid/ha).
▪ The predators of family coccinellidae and syrphidae (Paragus
auratus) are very active in the field.

9. REFERENCES
▪ https://agritech.tnau.ac.in/crop_protectioncrop_prot_crop_insectpest%20_cereals_ragi.html
▪ Jagadish, P.S., and I.S. Ragagopal 1997, Insecticidal control of ragi root aphid Tetraneura
nigriabdominalis (Sasaki), Homoptera: Pemphigidae) Abstract: National seminar on small
millets 23-24, April 1997 Coimbatore.
▪ https://www.kisansuvidha.com/pests-finger-millet/?v=ad4f1670f142
▪ Jagadish, P.S., and I.S., Rajagopal 1997, population dynamics of ragi root aphid Tetraneura
nigriabdominalis its natural enemies and biology of syrphid fly paragus auratus. Abstract:
National seminar on small millets 23-24, April 1997 Coimbatore

10. THANK YOU...