TNAU Agritech Portal
Home | About Us | Success Stories | Farmers Association | Farmers' Innovation | Publications | Contact

Horticultural crops :: Vegetables:: Tomato

Septoria Leaf Spot:Septoria lycopersici


Symptoms:
  • Small, round to irregular spots with grey centre and dark margin on leaves.
  • Spots coalesce and leaves are blighted.
  • Complete defoliation.
  • Stems and flowers are affected.

Irregular spots on leaves

Leaf spots

Causal Organism Septoria lycopersici Speg.

Mycelium : Hyaline and septate

Fruiting body : Pycnidium: globose, without distinct ostiole

Pathogen: Pycnidiospore : filiform, septate, hyaline

Survival and Mode of Spread

Survival: Infected plant debris

Primary spread: Mycelium or conidia

Secondary spread: Conidia through rain splash or wind

Favourable conditions

  • High humidity .

Integrated Disease Management

Cultural:

  • Removal and destruction of affected plant parts

Biological :

  • Seed treatment :Trichoderma asperellum @ 4g/kg seeds

Chemical:

  • Fluxapyroxad 250 g/l + Pyraclostrobin 250 g/l SC - 200-250 ml/ha.

Source of Information:

  • Crop production guide – Horticulture 2020.

Acknowledgement:

  • Dr.N. Indra, Associate Professor, Department of Plant Pathology, TNAU, Coimbatore.
  • Dr.P.Renukadevi, Professor, Department of Plant Pathology, TNAU, Coimbatore.
  • Photo courtesy Dr.S.Vinodkumar.

Updated on Jun 2023


Home | About Us | Success Stories | Farmers Association | Farmers' Innovation | Publications | Disclaimer | Contact Us

© TNAU 2008 - 2024 All Rights Reserved.