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Activity of a novel bactericide, zinc thiazole against Xanthomonas oryzae pv. oryzae in Anhui Province of China

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Abstract.
Bacterial leaf blight of rice (BLB), caused by Xanthomonas oryzae pv oryzae, is one
of the most serious bacterial diseases in China. Presently, bismerthiazol has been
the major bactericide for the control of BLB, however, bismerthiazol-resistant
strains of X. oryzae pv. oryzae have appeared in the field in China. Zinc thiazole
is a novel bactericide with strong antibacterial activity against Xanthomonas
spp. In this study, sensitivity of 109 X. oryzae pv. oryzae strains to zinc thiazole
was determined. The EC50 values for zinc thiazole in inhibiting bacterial
growth of the 109 X. oryzae pv. oryzae strains were 0.53–9.62 μg mL−1 with
the average EC50 value of 4.82±1.86 μg/ml. The minimum inhibitory concentration
(MIC) values of zinc thiazole against the 109 X. oryzae pv. oryzae
strains were assessed and the results showed that the MIC values of zinc thiazole
for completely inhibiting the growth of these 109 strains ranged from
5.0 to 40.0 μg mL−1. In the evaluation of protective and curative activity test,
zinc thiazole exhibited great activity against BLB and provided over 88%
control efficacy (at 300 μg mL−1) 1 and 3 days before or after inoculations,
which was also higher that that of bismerthiazol in the corresponding treatments.
Our field trials showed that zinc thiazole at 375 g.a.i ha−1 provided
over 70% control efficacy in 2012 and over 80% control efficacy in 2013
at both sites. Moreover, in all the four field trials, zinc thiazole at 250 g.a.i
ha−1 provided higher control efficacy than that of bismerthiazol at 250 g.a.i
ha−1. Taken together, zinc thiazole is therefore an alternative tool for the
management of BLB.

Keywords: baseline sensitivity; bismerthiazol; control efficacy; Xanthomonas oryzae pv. oryzae; zinc thiazole.

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Informasi Detail

Judul Seri

Annals of Applied Biology

No. Panggil

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Penerbit

Washington, D.C. : Association of Applied Biologists., 2015

Deskripsi Fisik

Ann Appl Biol 166 (2015) 129–135

Bahasa

English

ISBN/ISSN

00034746

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

166 (2015)

Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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