Yellow stem borer by mureed abbas(scirpophaga incertulas)
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Transcript of Yellow stem borer by mureed abbas(scirpophaga incertulas)
The pupa is
yellowish white with
a tinge of green. It
turns dark brown just
before adult
emergence. The
pupal stage takes
place inside the
stem, and often
below the soil
surface.
FEMALE V/S MALE
The female YSB moth has a pair of black spots at the middle of each whitish, light brown to yellowish forewing. It has a wingspan of 24-36 mm. Its abdomen is wide with tufts of yellowish hairs all over.
The male, gray or light brown in color, is smaller and has two rows of black spots at the tip of the forewings. It has a wingspan of about 20-30 mm. Its abdomen is slender toward its anal end and is covered with thin hairs dorsally
Yello rice stem borer is..... pest of deepwater rice.
found in aquatic environments
continuous flooding.
High nitrogenous field favors population buildup of the stem
borers.
Fields planted later favors more damage by the insect pest that
have built up in fields that have been planted earlier.
Stubble that remains in the field can harbor stem borer larvae and
or pupae.
Stemborers feed on the crop during the vegetative
and reproductive stages of the rice plant.
Excessive boring through the sheath can destroy the
crop.
Second instar larvae enclose themselves in body leaf
wrappings to make tubes and detach themselves
from the leaf and falls onto the water surface. They
attach themselves to the tiller and bore into the stem.
DRYING OF THE CENTER TILLER
Deadhearts or dead tiller that
can be easily pulled from the
base during the vegetative
stages
Whiteheads during reproductive
stage where the emerging
panicles are whitish and unfilled
or empty
Tiny holes on the stems and
tillers
Frass or fecal matters inside the
damaged stems
The young rice crop can be visually inspected for deadhearts in the vegetative stages and whiteheads in reproductive stages. Stems can be pulled and dissected for larvae and pupae for confirmation of stem borer damage.