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Chilli fruit borer

CHILLI  FRUIT BORER

Helicoverpa armigera
Noctuidae: Lepidoptera

Fruit borer, Helicoverpa armigera is a polyphagous pest and the peak activity is noticed during October to June month in chilli ecosystem.

Appearance: 

Moths has 'V' shaped speck on the light brownish forewing and a dark border on the hind wings, while larvae varied colour. Pupa brown in colour, occurs in soil, leaf, pod and crop debris. Eggs are spherical in shape and creamy white in colour.

 

     
             
     

                         Adult                                                            Varied colour Larvae

Life cycle:

Adult female lays eggs singly on buds, flower, and small fruits and on young terminal. Incubation period ranges from 2 to 5 days, and the  larval period lasts for 18 to  25 days. Pupation occurs in soil and the pupal period is 10-12 days. TLC 32-60 days. 8 generation per year.

Nature of damage:

Young larvae feed on flower buds and young pod by making a circular hole. Later, the larvae feed on seeds usually with its head inside the pod and rest of the body outside

  

     Young larvae feeding on flower buds and Po                                  

Damage symptoms:

A circular hole is noticed at the base of the pedicel. Premature dropping of flower and pods. Fruit turns to white colour

Circular Holes Near Pedicle

                      

Damaged fruits turns white and drop off

                                                    

Management: 

   Cultural practice:

  • Summer deep polughing.
  • Setup pheromone trap with Helilure at 15/ha for monitoring.

                 pheromone trap

                                                                                    

 

 Biological control

  • Six releases ofT. chilonis@ 50,000/ha per week coinciding with flowering time
  • Spray HaNPV at 1.5*10 12 POB/ha along with cotton seed oil 300 g/ha to kill larvae.
  • Release Chrysoperla Zotswani arabica at weekly interval at 50,000 eggs or grubs / ha from 30 DAS
  • Growing Marigold in chilli field: due to yellow colour of flower it attracts insect pest for egg laying this helps to manage pest incidence to some extent.               

 Chrysoperla Zotswani arabica

                                                               

  Chemical control:

  • Karnataka: Spray Rynaxypyr 20 EC @ 0.25ml/lit or spinosad 45SC @ 0. 12 ml/lit or chlorpyriphos 20 EC  @2.5ml/lit of water
  • Tamil Nadu: Spray endosulfan 35 EC @ 2 ml/lit or carbaryl 50 WP 2 g/lit or B. thuringiensis 2 g/lit
  • Spicedatabase: B.t. product @ 500 g/lit or Carbaryl 50 WP @ 12.
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