Epidemiology and Management of Post harvest diseases of Kinnow mandarin
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
Surveys were conducted periodically (twice in a month) from January to March during 2019
and 2020 to record the incidence and prevalence of major post-harvest rots of Kinnow
mandarin and pathogens associated with it in South-western Punjab. Highest incidence of
post-harvest rot of Kinnow mandarin 20.21 and 12.59 percent was observed in the month of
March during the year 2019 and 2020, respectively. Penicillium digitatum and Penicillium
italicum causing green and blue mould rots were found to be two most prevalent post-harvest
pathogens with their prevalence of 30.88 and 26.44 percent, respectively during 2019 and
32.44 and 24.88 percent, respectively, during 2020. Temperature of 25˚C favoured maximum
radial growth (84.67 mm) of both test pathogens also, maximum percent disease index of
green (95.00 percent) and blue mould rot (90.00 percent) was recorded at 25˚C. The pH 5.5
and 6.0 supported maximum radial growth of P. italicum by 90.00 & 88.66 mm and of P.
digitatum by 88.67 & 87.67 mm, respectively and were found to be at par with each other.
Among different GRAS chemicals and botanicals evaluated against test pathogens, copper
sulphate, boric acid, sodium bicarbonate and sodium carbonate at 100mM and above
concentrations among chemicals and garlic extract at 10 per cent and above concentration
among botanicals showed complete inhibition (100.0 percent) of both test pathogens under in
vitro, whereas, under in vivo garlic extract at the concentration of 15 percent showed complete
inhibition of green (100.0 percent) and of blue mold rot (92.22 percent). Boric acid at the
concentration of 4 percent showed complete inhibition (100.0 percent) of both the test
pathogens.
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Gurwinder Kaur (2021). Epidemiology and Management of Post harvest diseases of Kinnow mandarin