Efficacy of sedomil 72WP and recozeb 80WP to control die back (Colletotrichum gloeosporioides) of tea in Bangladesh
DOI:
https://doi.org/10.48165/Keywords:
Tea, dieback diseases, Colletotrichum gloeosporioides, mancozebAbstract
A study was conducted to find out the efficacy of sedomil 72WP (mancozeb) and recozeb 80WP (mancozeb + metalaxyl) to control of dieback disease (Colletotrichum gloeosporioides) of tea in Bangladesh. The pathogen, C. gloeosporioides was isolated from the dieback infected tea twigs on PDA medium. Mycelial blocks of the isolated pathogen were transferred to PDA plates amended with sedomil 72WP (mancozeb) @ 720, 1080, 1440 and 1800 ppm and recozeb 80WP (mancozeb + metalaxyl) @ 800, 1200, 1600 and 2000 ppm concentrations. Sedomil 72WP and recozeb 80WP caused colony growth inhibition, respectively by 75.00-90.77% and 75.88-91.33% in 2008 and 74.66-90.55% and 75.66-91.11% in 2009. In a field experiment at the main farm of Bangladesh Tea Research In stitute (BTRI), both fungicides were applied as foliar spray for three times at 1.0, 1.5, 2.0 and 2.5 kg ha-1. In 2008, sedomil 72WP gave 45.52-92.78% and recozeb 80WP gave 46.47- 90.39% reduction in PDI. In 2009, the reduc tion in PDI was 45.84-90.83% and 45.65-89.98% respectively under sedomil 72WP and recozeb 80WP. The use of sedomil 72WP and recozeb 80WP @ 2.5 kg ha-1and 2.0 kg ha-1are equally effective in controlling the disease. Both the fungicides are recommended at 2.0 kg ha-1against the dieback disease of tea and its causal organism.
References
Adil H Fazli R Hakim K. 2008 In vitro integrated con trol of Colletotrichum gloeosporioides with biological and chemical agents. Sarhad Jour nal of Agriculture 24(1): 79-84.
Ali MA Ali M Huq M Ahmed M. 1993 In vitro studies on fungicides against Colletotrichum gloeo sporioides (Penz.) Sacc.- the dieback of tea. Sri Lanka Journal of Tea Science 61(1): 25- 31.
Anonymous. 2013 Statistical Bulletin of Bangladesh Tea Board, January, 2013, Bangladesh Tea Board (BTB), Bangladesh, 8p.
Anonymous. 2011 Annual Bulletin of Statistics, 2011, International Tea Committee Ltd. 1, Carlton House Terrace, London, SW1Y5DB, UK, pp 42-47.
Barnett HL Hunter BB. 1972 Illustrated Genera of Imperfect Fungi, Burgess Publishing Co. Min neapolis, MN, USA, 241p.
Bhat N. 1991 Studies on fruit rot of pomegranate caused by Colletotrichum gloeosporioides and Aspergillus niger. M.Sc (Agri) Thesis, Univer sity Agricultural Science, Dharwad (India).
Freeman S Nizan Y Dtatan S Even S Sando T. 1997 Control of Colletotrichum acutatum in straw berry under lab, green house and field condi tions. Plant Disease 81: 749-52.
Huq M. 1995 Studies of Colletotrichum gloeo sporioides- the die-back pathogen on new clones and seedlings of tea. Tea Journal Bangladesh 31 (1&2): 23-28.
Huq M Ali M Islam MS. 2007 Approved Fungicides and Weedicides for Bangladesh Tea. Circular No. 119. Bangladesh Tea Research Institute, Srimangal, 6p.
Hussain A Raziq F Khan H. 2008 In vitro integrated control of Colletotrichum gloeosporioides with biological and chemical agents. Sarhad Journal of Agriculture 24(1): 79-84
Jamadar MM Shaikh MK Balikai RA. 1998 Chemical control of pomegranate fruit spot. Advanced Agriculture Research, India, 10: 13-15.
Legard D. 2000 Colletotrichum crown rot (anthracnose crown rot) caused by Colletotorichum fra gariae and Colletotrichum gloeosporioides. University of Florida, Gulf Coast Research & Education Wing.
Prashanth A Arun RS Naik MK Patil MB Rajesh SP. 2008 Evaluation of fungicides, bioagents, and botanicals against pomegranate anthracnose. Indian Journal of Plant Protection 36(2): 283- 87.
Sana DL. 1989 Tea Science, Ashrafia Boi Ghar 36, Bangla Bazar, Dhaka, pp. 216-17.
Singh RS. 2000 Assessment of disease incidence and loss. In Introduction to Principles of Pathol ogy, 3rd Ed, Oxford & IBH Publishing Co. Pvt. Ltd, 328p.
Suharban M Philip S Thomas Y. 1985 Fungicidal con trol of leaf spot disease of mango seedlings. South Indian Horticulture 33: 125-26.
Sundravadana S Alice D Kuttalam S Samiyappan R. 2007 Efficacy of Azoxystrobin on Colleto trichum gloeosporiodes Penz growth and on controlling mango anthracnose. Journal of Agricultural and Biological Science 2(3): 10- 15.
Solano V Arauz LF. 1995 Combating anthracnose in papaya fruit through fungicide application in Atlantic region of Costa Rica. Agronomia Costarricense 19: 25-30.
