(Rice yellow stem borer)
–Important pest of Rice Rice stem borers are common insect pests in many rice growing countries. Stem borers were
found in almost all rice ecosystems for year long. Stem borer larva damages rice stem and disturbs nutrient
translocation from root to leaf. As the result, tillers in vegetative stage died, which is called dead heart.
When larva infests generative stage, it causes empty panicle, which is called whitehead.
Life history :
The wingspan of the male is 18–22 mm and the female is 34 mm. Adult males are smaller than the females.
Males are brownish ochreous. Forewings irrorated (sprinkled) with dark scales and with the veins slightly streaked
with fuscous. A black spot found at lower angle of cell. There is an oblique fuscous line runs from apex to vein.
A marginal black specks series can be seen. Hindwings ochreous white. Female fuscous brown with pale fuscous hindwings.
Eggs are creamy white, flattened, oval and scale like and laid in mass and covered with buff coloured hairs.
Full-grown larvae are pale yellow to yellowish green with a brown head and reach a length of 20 mm.
Pupation takes place in a white silk cocoon.
Host plants :
Mainly a pest of Paddy.
Its incidence is most predominant in tropical lowland rice and deep-water rice. The pest attacks
all stages of the crop. Early instars bore into the leaf sheath and causing longitudinal yellowish-white patches as
a result of feeding. Then it invades the stem of the rice plant and stays in the pith to feed on the inner surface
of the stem wall. These are not externally visual as symptoms. Severe feeding causes a deep circular cut through
the parenchyma tissue showing ‘dead heart’ symptom (drying up of central shoot) and damage during the panicle initiation
stage results in ‘white ear’(chaffy, unfilled grains).
ETL for Scirpophaga incertulas is 6-8 No’s of moths per trap per day.
Use 8-10 No’s Pheromone Traps per acre. Install within 1-week crop stage to control pest at early stage.
Trap canopy should be placed one feet above crop canopy to achieve optimum catch.
Recommended trap model:
Phero-Sensor-SP™ or Phero-Sensor - BP™
Recommended for: Paddy.