Paddy stemborer: Scirpophaga incertulas
Symptom of damage:
- Presence of brown coloured egg mass near leaf tip
- Caterpillar bore into central shoot of paddy seedling and tiller, causes drying of the central shoot known as “dead heart”
- Grown up plant whole panicle becomes dried “white ear”
- Plants could be easily pulled by hand
Identification of insect pest:
- Egg: 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 fore wings with a black spot possess a tuft of yellow hairs
Male moth: Smaller with pale yellow forewings without black spot
Management:
ETL: 25% Dead heart symptoms
ATL (Action Threshold Level): 2 egg masses/m2
- At ATL release egg parasitoid, Trichogramma japonicum for the management of the rice yellow stem borer
- Spraying Neem seed kernel extract controls stem borer
- Clip the seedling tips before transplanting to eliminate egg masses and collect and destroy the egg masses in main field
- Spray any one of the following insecticides
- Phosalone 35 EC 1500 ml/ha
- Acephate 75 % SP 666-1000 g/ha
- Azadirachtin 0.03% 1000 ml/ha
- Carbofuran 3% CG 25 kg/ha
- Carbosulfan 6% G 16.7 kg/ha
- Carbosulfan 25% EC 800-1000 ml/ha
- CartapHydrochloride 50 % SP 1 kg/ha
- Chlorantraniliprole 18.5% SC 150 ml/ha
- Chlorantraniliprole 0.4% G 10 kg/ha
- Chlorpyriphos 20% EC 1.25 l/ha
- Fipronil 5% SC 1000-1500 g/ha
- Fipronil 80%WG 50- 62.5 kg/ha
- Flubendiamide 20% WG 125 g/ha
- Flubendiamide 39.35% M/M SC 50 g/ha
- Phosphamidon 40% SL 1250 ml/ha
- Thiacloprid 21.7% SC 500 g/ha
- Thiamethoxam 25% WG 100 g/ha
- Triazophos 40% EC 625-1250 ml/ha
Source-
- TNAU Agritech Portal.
