Botanical pesticides in the management of Xanthomonas campestris pv. campestris and Alternaria brassicae of cabbage
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Date
2016
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DEPARTMENT OF BIOLOGICAL SCIENCES Sam Higginbottom University of Agriculture, Technology and Sciences Allahabad-211007 2016
Abstract
The experiments were conducted in the field and research laboratory of Department of Plant
Pathology, Sam Higginbottom University of Agriculture, Technology and Sciences, Allahabad
(Deemed to-be University) during two rabi seasons of 2012-2014. The field experiment was
planned in Randomized Block Design (RBD) with three replications for each treatment and
Complete Randomized Design (CRD) in laboratory with four replications for each treatment.
The site selected for experimentation was uniform, cultivable with typical sandy loam soil
having good drainage. Observations were recorded at screening of 75 plant leaf extracts and their
antimicrobial activity against Alternaria brassicae and X. campestris pv. campestris, assayed of
secondary metabolites and active compound from the selected 12 botanicals. Results summarized
that Bordeaux mixture @ 0.2% was recorded minimum mycelial radial growth (8.67, 12.07,
20.65 and 22.85 mm) and maximum % inhibition as compared with all the botanicals leaf
extract. The least mycelium growth of Alternaria was found in the neem leaf extract @ 50 %
concentration (7.70 and 10.45mm) at 48 and 72 hrs after incubation. Neem oil was observed
maximum population reduction of X. campestris and inhibition % over control at the rate of 2, 4
and 6% concentrations on 48 hrs (6, 5.7 and 2.7, respectively) and 72 hrs (15, 9.7 and 8.7,
respectively) . Per cent disease intensity of black leaf spot (Alternaria brassicae) was reduced
maximum in the treated plots with Bordeaux mixture (15.23, 16.33, 19.93 and 21.94), While in
the botanical extracts, neem oil was found maximum reduction of disease intensity at different
D.A.S. Maximum cabbage head diameter (cm) was observed in the sprayed plots with
Azadirachta indica oil (14.10, 25.20) at 90 and 120 days after sowing. The edible head weight
(g) at harvesting time, it was recorded that maximum in the Bordeaux mixture (1782.06 g) and
Azadirachta indica (1740.46) followed by all other essential oils
Description
Ph.d. thesis
Keywords
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