Investigation on predisposing factors for outbreak of root rot of mulberry and disease management with special emphasis on use of biocontrol agents and botanicals

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1.

Project Code

:

PRP-3328

2.

Title

:

Investigation on predisposing factors for outbreak of root rot of mulberry and disease management with special emphasis on use of biocontrol agents and botanicals

3.

Investigators

:

Chowdary NB, Mala VR, Sharma DD, Naik VN, Reddy MM, Babu AM.

4.

Project period

:

April, 2003-March, 2006

5.

Institute/ University

 

CSR&TI, Mysore

6.

Project cost

:

1.50 Lakh

7.

Objectives

  • To isolate and identify the soil borne pathogens involved with root rot disease and their pathogenicity study.
  • To establish edaphic factors responsible for outbreak of root rot disease.    
  • To understand the mode of infection & development of root rot pathogens through LM and SEM studies.    
  • To develop an effective bio-management method for root rot disease through bio-control agents & botanicals.

8.

Important findings

Rhizoctonia solani, F. solani, F. oxysporum and black sterile mycelia were identified as causing root rot in mulberry.

The root rot disease outbreak was more in alkaline and sandy soils (both black and red) with low soil moisture (below 40 %) and low nutrient contents (OC, N, P & Zn).

Conducting tissues were blocked with fungal mycelia preventing the translocation of water and nutrients to the aerial parts leading to wilting of the plant.

 Among 12 bio-agents, 10 botanicals & 5 oil cakes were tested, 3 region specific (KA, AP, TN) isolates of Trichoderma (Tri-2, Tri-5 & Tri-11), neem oil cake and Glyricidia maculata were found effective against all the root rot pathogens.

Maximum disease control was recorded in bioconsortium made from 3 isolates of Trichoderma viz., Tri-2, Tri-5 & Tri-11 + Neem oil cake + Glyricidia maculata  (87.7%).

The following formulations were developed

A bioconsortium viz., Tri-mix for management of root rot disease.

A bioinoculant viz., Compo-mix for hastening the composting process and to produce disease suppressive quality compost.

A herbal formulation CHETAK for management of major foliar and root diseases of mulberry.

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