Morphological characterization and epidemiological studies of summer squash (Cucurbita pepo) powdery mildew

POOJA BHARMERA; S K GUPTA; DURGA PARSAD; MONICA SHARMA

doi:10.56093/ijas.v91i7.115119

Authors

POOJA BHARMERA Dr Y S Parmar University of Horticulture and Forestry, Neri, Hamirpur, Himachal Pradesh 177 001, India
S K GUPTA M S Swaminathan School of Agriculture, Shoolini University of Biotechnology and Management Sciences, Solan
DURGA PARSAD RHR&TS Sharbo, Dr YSP University of Horticulture and Forestry, Kinnaur, HP
MONICA SHARMA College of Horticulture & Forestry, Dr YS Parmar University of Horticulture and Forestry, Hamirpur, HP

https://doi.org/10.56093/ijas.v91i7.115119

Keywords:

Anamorphs, Epidemiology, Cucurbita pepo, Sphaerotheca fuliginea, Teleomorphs

Abstract

Samples of powdery mildew of summer squash (Cucurbita pepo L.) collected from Solan, Shimla, Hamirpur and Kinnaur districts of Himachal Pradesh during 2017-18 revealed the presence of anamorphs, whereas the cool and dry temperate region of district Kinnaur showed the occurrence of both teleomorphic and anamorphic stages of powdery mildew on summer squash. Present studies constitute the first report of cleistothecial occurrence on summer squash under Indian conditions. Based on anamorphic characters like ellipsoidal conidia, presence of fibrosin bodies and germinating conidia produced both simple and forked germ tubes without appressorium and teleomorphic characters like cleistothecia with myceloid appendages, single ascus with eight ascospores the associated pathogen was identified as Sphaerotheca fuliginea (Schlecht.) Pollaci. Maximum conidial germination was observed at 25° temperature and 100% relative humidity. The development of powdery mildew disease was significantly favored at moderate temperature coupled with high relative humidity and cumulative rainfall.

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