Occurrence of powdery mildew disease of Gerbera in Kerala

A purposive sampling survey on the hilly tracts of Wayanad, Kerala revealed the existence of powdery mildew disease in gerbera crops, grown under both protected and open field condition. Among the other fungal diseases of gerbera, powdery mildew disease causes decisive damage to the ornamental cut f...

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Autores principales:	N M Praveen, Reshmy Vijayaraghavan, S Beena, S Krishnan
Formato:	article
Lenguaje:	EN
Publicado:	Society for Promotion of Horticulture - Indian Institute of Horticultural Research 2018
Materias:	gerbera, golovinomyces cichoracearum podosphaera sp., per cent disease severity Plant culture SB1-1110
Acceso en línea:	https://doaj.org/article/b929edba2f7048c8a4f02fd89a9c695e
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spelling	oai:doaj.org-article:b929edba2f7048c8a4f02fd89a9c695e2021-12-02T15:39:33ZOccurrence of powdery mildew disease of Gerbera in Kerala0973-354X2582-4899https://doaj.org/article/b929edba2f7048c8a4f02fd89a9c695e2018-12-01T00:00:00Zhttps://jhs.iihr.res.in/index.php/jhs/article/view/520https://doaj.org/toc/0973-354Xhttps://doaj.org/toc/2582-4899A purposive sampling survey on the hilly tracts of Wayanad, Kerala revealed the existence of powdery mildew disease in gerbera crops, grown under both protected and open field condition. Among the other fungal diseases of gerbera, powdery mildew disease causes decisive damage to the ornamental cut flower crop, thereby decline in the industrial value of the crop. Symptom of the disease include as white powdery mat on the upper surface of leaf lamina that gradually turned pale yellow to brown. Powdery mildew existed in two locations of Wayanad viz., Ambalavayal and Chulliyode where highest per cent disease severity (PDS) of 50.72 was observed at Chulliyode and 47.2 per cent was observed at Ambalavayal during November- December. In Ambalavayal, the disease was non-significant and no correlation existed between weather parameters and disease progress. But, in Chulliyode, correlation studies revealed that it was significant with positive correlation to relative humidity and a reverse relation existed with temperature and rainfall. The weather data clearly depicts that at a low rainfall of 96 mm and above average relative humidity of 80.27 per cent during November-December was the congenial factor influencing the disease development. But during summer, decline in relative humidity (78.37%) and rainfall (63.13 mm) caused a slight reduction in mean per cent disease severity of 49.12 per cent and 33.6 per cent at Chulliyode and Ambalavayal respectively. Morohological and cultural characters of the pathogen depicts presence of two distinct organism viz., Golovinomyces cichoracearum (Erysiphe cichoracearum) and Podosphaera sp. as the causative organism of the disease. Golovinomyces cichoracearumproduced hyaline, septate mycelia with globose conidia with irregular peripheral end formed in a chain and Podosphaera sp. produced superficial, hyaline, coenocytic mycelium with oval or ellipsoidal, catenate conidia with dimension ranging from 22.1-30.18 x 13.36-18.08ìm formed in unbranched erect conidiophores.N M PraveenReshmy VijayaraghavanS BeenaS KrishnanSociety for Promotion of Horticulture - Indian Institute of Horticultural Researcharticlegerbera,golovinomyces cichoracearumpodosphaera sp.,per cent disease severityPlant cultureSB1-1110ENJournal of Horticultural Sciences, Vol 13, Iss 2, Pp 217-220 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	gerbera, golovinomyces cichoracearum podosphaera sp., per cent disease severity Plant culture SB1-1110
spellingShingle	gerbera, golovinomyces cichoracearum podosphaera sp., per cent disease severity Plant culture SB1-1110 N M Praveen Reshmy Vijayaraghavan S Beena S Krishnan Occurrence of powdery mildew disease of Gerbera in Kerala
description	A purposive sampling survey on the hilly tracts of Wayanad, Kerala revealed the existence of powdery mildew disease in gerbera crops, grown under both protected and open field condition. Among the other fungal diseases of gerbera, powdery mildew disease causes decisive damage to the ornamental cut flower crop, thereby decline in the industrial value of the crop. Symptom of the disease include as white powdery mat on the upper surface of leaf lamina that gradually turned pale yellow to brown. Powdery mildew existed in two locations of Wayanad viz., Ambalavayal and Chulliyode where highest per cent disease severity (PDS) of 50.72 was observed at Chulliyode and 47.2 per cent was observed at Ambalavayal during November- December. In Ambalavayal, the disease was non-significant and no correlation existed between weather parameters and disease progress. But, in Chulliyode, correlation studies revealed that it was significant with positive correlation to relative humidity and a reverse relation existed with temperature and rainfall. The weather data clearly depicts that at a low rainfall of 96 mm and above average relative humidity of 80.27 per cent during November-December was the congenial factor influencing the disease development. But during summer, decline in relative humidity (78.37%) and rainfall (63.13 mm) caused a slight reduction in mean per cent disease severity of 49.12 per cent and 33.6 per cent at Chulliyode and Ambalavayal respectively. Morohological and cultural characters of the pathogen depicts presence of two distinct organism viz., Golovinomyces cichoracearum (Erysiphe cichoracearum) and Podosphaera sp. as the causative organism of the disease. Golovinomyces cichoracearumproduced hyaline, septate mycelia with globose conidia with irregular peripheral end formed in a chain and Podosphaera sp. produced superficial, hyaline, coenocytic mycelium with oval or ellipsoidal, catenate conidia with dimension ranging from 22.1-30.18 x 13.36-18.08ìm formed in unbranched erect conidiophores.
format	article
author	N M Praveen Reshmy Vijayaraghavan S Beena S Krishnan
author_facet	N M Praveen Reshmy Vijayaraghavan S Beena S Krishnan
author_sort	N M Praveen
title	Occurrence of powdery mildew disease of Gerbera in Kerala
title_short	Occurrence of powdery mildew disease of Gerbera in Kerala
title_full	Occurrence of powdery mildew disease of Gerbera in Kerala
title_fullStr	Occurrence of powdery mildew disease of Gerbera in Kerala
title_full_unstemmed	Occurrence of powdery mildew disease of Gerbera in Kerala
title_sort	occurrence of powdery mildew disease of gerbera in kerala
publisher	Society for Promotion of Horticulture - Indian Institute of Horticultural Research
publishDate	2018
url	https://doaj.org/article/b929edba2f7048c8a4f02fd89a9c695e
work_keys_str_mv	AT nmpraveen occurrenceofpowderymildewdiseaseofgerberainkerala AT reshmyvijayaraghavan occurrenceofpowderymildewdiseaseofgerberainkerala AT sbeena occurrenceofpowderymildewdiseaseofgerberainkerala AT skrishnan occurrenceofpowderymildewdiseaseofgerberainkerala
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Occurrence of powdery mildew disease of Gerbera in Kerala

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