|
Introduction
& symptoms
On
seedling, the infection appear as tiny water soaked spot at the marjin on
the leaves. The spore
enlarge to cover the whole leaf which turn yellow
and dry up.
On
leaf blade, the infection begins at the margin as water soaked stripe. The
lesion enlarges in length and width resulting in the wavy margin and
yellow leaf within few days. The lesion can cover the whole leaf blade,
turn white and later grayish contaminated with various saprophytic fungi.
A
turbid ooze of the bacterium, steaming from the vascular bundle can be
observed on immersing the cut end
of affected leaves in clear water.
Management
-
High
temperature favour diseases development.
-
In
kresek phase symptom appear within 10 days at about 30oC wile none were
observed after 40 days at 20oC.
-
Lesion
enlarge and leaves die faster at high temperature. High rate of nitrogen
fertilizer increases development thus
to control the disease effectively, balanced use of
nitrogen is necessary.
-
Application
of Streptocycline @ .6% for
spray.
-
Use
seed from disease free crop.
-
Treat
the seeds by soaking it for 12hrs
in a mixed solution of
streptocycline(0.15%) and wetable Ceresan(0.05%) followed by hot water
treatment at 52oC-54oC foe 30 minutes.
-
Drain
away the water from fields as frequently as possible.
-
Grow
resistant varieties such as IR-20,IR-54,Pusa2-21, Ajay, Asha and Daya.
|
