GREEN EAR DISEASE OF BAJRA

DR. RAJBIR SINGH Assistant Professor

Department of Plant Pathology Gochar Mahavidyalaya, Rampur Maniharan, Saharanpur (UP), India Affiliated to Ch. Charan Singh University, Meerut (UP), India

Email: rajbir25805@yahoo.com, rajbirsingh2810@gmail.com

Cell No. 91-9456613374

Green Ear Disease of Bajara In India reported by Butler – 1907

Reported from- UP, MP, HR, Delhi, Punjab, Guj., Knt., Maha., TN

Loss – till 100%

Symptoms: (1). Downey mildew stage on leaves

(2). Green ear stage

(3). Shoot & bud deformations stage

1. Downey mildew stage

• Plants - yellow, small and weak

• Leaves - chlorosis, streaks on leaves

• Old leaves affected more than new

• Morning- Downey growth on lower surface of leaves

• Streaks- brown- shrinking of leaves

• On Neocant plants – Downey growth - growth stop and

they die

2. Green Ear stage

• No ear formation

• If form – leafy structure, hairy

• Ear appear as Bunch of Green Leaves so called “Green Ear

Disease”

• No grain formation - may be partially

• Flower parts – glumes, plea, stamens, pistils etc. hypertrophy &

proliferation – convert into leafy structures

• Later leafy structures - dry and become brown

3. Shoot and bud deformation

• Less tillers formation

• Dwarfing & plants look like “Bush”

• Because internodes become small

• Buds become deform

• Auxiliary shoots – proliferate

Casual Organism - Sclerospora graminicola

• Pathogen – Obligate parasite

• Systemic infection

• Sporangophore – di or trichotomous

• Soilborne – Oospore

• Seedborne - Oospore

• R. H. - >75%

• Temp. – 15 – 25° C

Systemic Position

Kingdom – Mycota/ Fungi

Division – Eumycota

Sub division – Mastigomycotina

Class – Oomycetes

Order – Pernosporales

Family – Pythiaceae

Genus – Phytophthora

Species - infestans

Disease Management• Use certified seed

• Removal of infected plants

• Crop rotation of 5 years

• Seed treatment – Thiram- @ 2.5 gm/ kg seed

• Spray- Mencozeb @2.5 kg/hec

• First spray – 2-3 week after sowing

Second spray - at the time of ear formation

• Disease resistant varieties- Pusa Moti, HB-1, BBH-4, Pusa-23

Thank You