ISOLATION AND CHARACTERIZATION OF Sclerotium rolfsii SACC. CAUSING COLLAR ROT OF PIGEONPEA IN TRIPURA

  • Durga Prasad Awasthi
  • Partha Das
  • Biman De
  • Sujoy Hazari
  • Navendu Nair
Keywords: Disease incidence, sclerotia,, PDA medium

Abstract

In Tripura, Pigeonpea {Cajanus cajan (L.) Millsp.} is grown in an area of 6,500 ha having productivity of 1.8 t/ha. Among major diseases of pigeonpea in Tripura such as Phytophthora Stem Blight (PSB) and Fusarium  Wilt; a new disease namely collar rot caused by the fungi Sclerotium rolfsii Sacc. is becoming a crucial threat.  The disease starts appearing after one to four weeks of sowing of the crop in a sporadic manner. Leaves of the plants shows water soaked light brown or yellow appearance followed by drooping and drying of leaves. Under favourable climatic condition collar region of the infected plant shows white mycelia growth of the fungus and sometime initials of sclerotia were also observed under in vivo condition. During present study average disease incidence of 8.5% was observed in the year 2015-16 & 2016-17. The fungus was isolated and grown in Potato Dextrose Agar (PDA) medium & Koch’s postulates was confirmed. Cultural and morphological characteristics like dry mycelial weight, mycelial diameter, time of appearance of initials of sclerotia, pattern and numbers of sclerotia produced were also recorded. Small reddish brown sclerotia were found to be distributed throughout the petri plates, average numbers of sclerotia produced was found to be 573.

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Author Biographies

Durga Prasad Awasthi

Department of Plant Pathology, College of Agriculture, Tripura-799 210, INDIA

Partha Das

AICRP on Pigeonpea, College of Agriculture, Tripura-799210, INDIA

Biman De

AICRP on Pigeonpea, College of Agriculture, Tripura-799210, INDIA

Sujoy Hazari

AICRP on Pigeonpea, College of Agriculture, Tripura-799210, INDIA

Navendu Nair

Department of Entomology, College of Agriculture, Tripura-799210, INDIA

Published
2018-09-25
How to Cite
Awasthi, D., Das, P., De, B., Hazari, S., & Nair, N. (2018, September 25). ISOLATION AND CHARACTERIZATION OF Sclerotium rolfsii SACC. CAUSING COLLAR ROT OF PIGEONPEA IN TRIPURA. Innovative Farming, 3(3), 103-105. Retrieved from http://innovativefarming.in/index.php/innofarm/article/view/270