STUDIES ON GREY MOULD ROT OF STRAWBERRY AND ITS MANAGEMENT
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Date
2011
Authors
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Journal ISSN
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Publisher
UHF,NAUNI,SOLAN
Abstract
ABSTRACT
Grey mould rot is most destructive disease of Strawberry, wherever it is grown in the
world causing yield losses up to 90 per cent. Present investigation was undertaken with the
objectives to study the occurrence of this disease, role of abiotic environmental factors in its
initiation and development and to devise suitable disease management practices. The disease was
observed to occur in moderate to severe form in different Strawberry growing areas of Solan,
Kullu, Sirmaur and Mandi districts of Himachal Pradesh, with maximum disease incidence
(31.45%) in Dhaulakuan area of Sirmaur district. The associated fungus was isolated from the
infected fruit samples collected from different locations and Koch’s postulates were proved. On
the basis of morphological characters like shape, size and colour of conidia and conidiophores, the
fungus was identified as Botrytis cinerea Pers. ex. Fr. Weather parameters were found to put
considerable effect on disease development under field conditions. Low to moderate temperature
(15-20ºC) accompanied with moderate to high humidity (65-73%) and minimum sunshine hrs (4-6
hrs) favoured the disease development. Disease incidence was positively correlated with relative
humidity, rainfall and sunshine hours and negatively with temperature. Among twenty four
cultivars of Strawberry screened against the target disease under natural epiphytotic conditions,
five namely; Elsanta, Missionary, Senga Sengana, Tioga and Chandler exhibited highly
susceptible reactions. Under in vitro conditions, fungicide carbendazim was most effective in
inhibiting the growth of the pathogen and was followed by captan + hexaconazole, mancozeb and
carbendazim+ Iprodione, respectively. Under filed conditions, three consecutive sprays of
carbendazim (0.05%) starting with the first appearance of disease at 15 days interval was most
effective (94.33 PDC). Next best fungicides were captan + hexaconazole and hexaconazole in
order. Polythene mulch combined with two sprays of carbendazim (0.05%) was equally effective
(94.20%). Further, leaf water extract of Vitex negundo was most effective under in vitro
conditions against the target pathogen followed by vermiwash and neem leaf water extract.
Description
Keywords
economics, biological phenomena, resins, productivity, technological changes, exhibitions, developmental stages, marketing, biological development, selection