Management of Alternaria leaf spot of coriander incited by Alternaria alternat
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Date
2022
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Abstract
Coriander (Coriandrum sativum L.) is an important seed spice
crop of India specially growing in Rajasthan. The crop suffers from
several disease among those leaf spot is emerging as a major problem
in coriander cultivation.
Leaf spot infected leaves of coriander were collected from
farmer’s field. Pathogen was isolated, purified and identified as
Alternaria alternata and its pathogenicity was proved.
Four bio-agents were evaluated against Alternaria alternata by
dual culture technique. Among all the tested bio-agents Trichoderma
harzianum was found best which inhibit maximum mycelial growth
(74.44%) of fungus. When bio-agents were used as seed treatment
and soil application under field conditions, Trichoderma harzianum was
found most effective and resulted in significant reduction in disease
intensity (38.30%) as compared to untreated control.
The leave extract of five plant species were evaluated at two
concentrations (5% and 10%) against Alternaria alternata by Poisoned
Food Technique. The leave extract of neem (88.88% at 10% and
83.33% at 5%) followed by garlic were found most promising in
inhibiting mycelial growth at both concentrations. When plant leave
extracts tested as foliar application under field conditions, neem was
found most effective with maximum disease control (50.94 at 10%)
followed by garlic leave extract.
Biochemical studies on coriander leaf spot disease induced by
A. alternata was carried out. Significant increase in phenol and
peroxidase (PO) was found in infected plants as compared to healthy
plants. A reduction in sugar content was also observed with the
increase in disease severity.
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A Post Graduate Student, Department of Plant Pathology, S.K.N. College of Agriculture, Jo