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Crop Protection :: Pest of paddy

II. Main Field Pests

Yellow Stem Borer stemborer: Scirpophaga incertulas

Symptom of damage:

  • Presence of brown coloured egg mass near leaf tip
  • Larva bores into central shoot of paddy seedling and tiller, causing drying of the central shoot known as “dead heart”
  • If infestation occurs in grown up plant, the whole panicle becomes dried and known as “white ear”
  • Affected shoots and panicles could be easily pulled by hand

Identification of insect pest:

  • Eggs: are creamy white, flattened, oval and scale like and laid in mass and covered with buff coloured hairs
  • Larva: pale yellow with dark brown head
  • Pupa: White silken cocoon are found inside the stem
  • Adult:

Female moth: Bright yellowish brown; forewings with a black spot.
Male moth: Smaller with pale yellow; forewings without black spot

Dead heart White ear
 

Scirpophaga incertulas

Egg
Larva Adult

Chilo polychrysus

Larva
Adult

Sesamia inferens

Larva
Adult

Management:

ETL: 10% Dead heart symptoms 2% white ear symtoms

  • Clip the seedling tips before transplanting to eliminate egg masses.
  • Install light trap @ 1 / ha and pheromone trap @ 5 / ac.
  • Release egg parasitoid, Trichogramma japonicum @ 2cc /ac 3 times at weely interval.
  • Spray Neem seed kernel extract 5% or Azadirachtin 0.03% 400 ml/ac.
  • Spray any one of the following insecticides
    • Acephate 75 % SP 267-400 g/ac
    • Carbofuran 3% CG 10 kg/ac
    • Carbosulfan 6% G 6.7 kg/ac
    • Carbosulfan 25% EC 320-400 ml/ac
    • CartapHydrochloride 50 % SP 400 g/ac
    • Chlorantraniliprole 18.5% SC 60 ml/ac
    • Chlorantraniliprole 0.4% G 4 kg/ac
    • Chlorpyriphos 20% EC 500 ml/ac
    • Fipronil 5% SC 400-600 g/ac
    • Fipronil 80%WG 20-25 g/ac
    • Flubendiamide 20% WG 50 g/ac
    • Flubendiamide 39.35% M/M SC 20 g/ac
    • Thiacloprid 21.7% SC 200 g/ac
    • Thiamethoxam 25% WG 40 g/ac
Trichogramma japonicum egg card Egg parasitoid
(Magnified view)
Light Trap Pheromone Trap
 

 

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