Skip to main content

Stem rot


Stem rot: Sclerotium oryzae Catt (Deuteromycotina: Mycelia Sterilia)

Kannada Name : Kanda Kole Roga

It is an important disease particularly in water logged areas.

Period of occurrence : Later stages of plant growth

Extent of yield loss: 18 to 56%

Favorable conditions for the pathogen:

  • Weakened plant due to physiological imbalance
  • Unusual drought or insect attack, particularly stem borer incidence
  • Lodging of the plant
  • High levels of nitrogen and phosphorus fertilizer application.

Sources of inoculum: Sclerotial bodies embedded in the infected stubbles and soil.

Mode of transmission: Irrigation or Flood water.

Symptoms:

  • Small, black irregular lesions on the outer leaf sheath near the water line. As disease advances, the discoloration spreads up and down from the water line.
  • Drying up of leaves at seedling stage.
  • Lodging of the plant due to weakening of the stem base along with yellowing and death.
  • Ears with lighter grains

Preventive measures:

  • Use of resistant varieties like Govind, Jagannath, Jalmagna, Pankaj, Saharmati.
  • Addition of organic manure
  • Burn rice stubbles and infected straw.
  • Irrigation water should not be directed from an infected to a non-infected field.

Control measures:

Chemical control- Foliar sprays should be taken up after draining the field.

Recommended fungicides

Sl. No.

Chemical name

Trade name

Dosage per l of water

Dosage for spray tank

10 l

12 l

16 l

Liquid/Spray formulations (EC, SL, WP, WG, WDG, SC)

1.

Iprobenphos 48 EC

Kitazin

2.0 ml

20 ml

24 ml

32 ml

2.

Carbendazim 50 WP

Bavistin, Jkstin, Derosal

1.0 g

10 g

12 g

16 g

3.

Thiophenate-methyl 70 WP

Roko

Topsin-m

1.0 g

10 g

12 g

16 g

0
Your rating: None Average: 5 (1 vote)