STUDIES ON REPLANT PROBLEM IN PEACH [Prunus persica (L.) Batsch]
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Date
2018-02
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation entitled “Studies on replant problem in peach [Prunus persica
(L.) Batsch]” was carried out in a private orchard at village Matnali, Tehsil Rajgarh, District Sirmour
and Department of Fruit Science, Dr. Y S Parmar University of Horticulture and Forestry, Nauni,
Solan, Himachal Pradesh during the years 2015 and 2016. The objectives of the study were to identify
biotic causes of peach replant problem and to study the effects of different soil management practices
on plant and rhizosphere related parameters under replant situations. A survey of declined peach
orchards was conducted and rhizospheric soil samples were collected from different locations of
District Sirmour. The studies were conducted under two different experiments (field and pot-culture),
laid out using RBD and CRD, respectively, comprising of 6 treatments including 3 variants viz., soil
fumigation, PGPR and biocontrol in 5 different combos and a control (i.e. Recommended package of
practices); each with four replications. The process of isolation and identification of fungal pathogens
yielded following biotic suspects Aspergillus flavus, Aspergillus nidulanse, Aspergillus niger,
Aspergillus oryzae, Penicillium chrysogenum, Penicillium expansum, Penicillium griseofulvum,
Alternaria alternata, Acremonium byssoides, Acremonium strictum, Acremonium kiliense,
Gilmaniella humicola, Geotrichum candidum, Chaetomium murorum, Phoma destructive, Fusarium
oxysporum, Fusarium solani, Mycelia sterilia, Fusarium equiseti and Humicola grisea. Some of these
fungi have been previously identified while others represent new candidates. Subsequent Koch’s
postulates investigations will assess their possible roles in peach replant disease. Further, in
consideration of inference drawn from data with respect to plant and rhizosphere soil parameters,
combined treatment (Soil fumigation +PGPR +Biocontrol+25% more of recommended SSP) proved
to be a potential agro-technique to combat replant problem in peach, which recorded marked increase
in growth and vigour, physiological parameters, foliar and available soil nutrient status as well as soil
biological parameters under present investigations.
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