Adaptation of mancozeb by Bipolaris oryzae and B. sorokiniana , the causal organisms of brown spot of wild rice.

M K Kardin, JA Percich

Research output: Contribution to journalArticle

Abstract

Isolates of B. oryzae and B. sorokiniana from wild rice (Zizania aquatica ) initially did not grow on potato-dextrose agar (PDA) amended with mancozeb higher than 100 mu b/ml. Resistance of both species ot mancozeb was obtained by transferring repeatedly to media containing increasing concentrations of the fungicide. After eight to nine passages on media amended with increasing concentrations of mancozeb, four isolates of B. oryzae and B. sorokiniana produced colonies that grew at 8,000 mu g/ml of mancozeb. Growth and sporulation of mancozeb-resistant strains of both species on unamended PDA were reduced compared with the wild types. Resistance to mancozeb was lost after subculturing once on fungicide-free media. The similarity of sensitivity of a limited number of isolates of these fungi from fungicide-treated or untreated fields to mancozeb suggested that resistance to this fungicide did not occur in the field.
Original languageEnglish (US)
Pages (from-to)477-480
Number of pages4
JournalPlant Disease
Volume67
Issue number5
StatePublished - 1983

Fingerprint

Bipolaris sorokiniana
wild rice
mancozeb
organisms
fungicides
Zizania aquatica
agar
potatoes
fungicide resistance
glucose
Bipolaris oryzae
sporulation
fungi

Keywords

  • resistance
  • brown spot
  • Bipolaris oryzae
  • Zizania aquatica
  • mancozeb
  • Bipolaris sorokiniana
  • A 01026:Gramineous crops
  • Microbiology Abstracts A: Industrial & Applied Microbiology
  • K 03089:Fungi: plant
  • Microbiology Abstracts C: Algology, Mycology & Protozoology
  • A 01064:Microbial resistance

Cite this

Adaptation of mancozeb by Bipolaris oryzae and B. sorokiniana , the causal organisms of brown spot of wild rice. / Kardin, M K; Percich, JA.

In: Plant Disease, Vol. 67, No. 5, 1983, p. 477-480.

Research output: Contribution to journalArticle

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abstract = "Isolates of B. oryzae and B. sorokiniana from wild rice (Zizania aquatica ) initially did not grow on potato-dextrose agar (PDA) amended with mancozeb higher than 100 mu b/ml. Resistance of both species ot mancozeb was obtained by transferring repeatedly to media containing increasing concentrations of the fungicide. After eight to nine passages on media amended with increasing concentrations of mancozeb, four isolates of B. oryzae and B. sorokiniana produced colonies that grew at 8,000 mu g/ml of mancozeb. Growth and sporulation of mancozeb-resistant strains of both species on unamended PDA were reduced compared with the wild types. Resistance to mancozeb was lost after subculturing once on fungicide-free media. The similarity of sensitivity of a limited number of isolates of these fungi from fungicide-treated or untreated fields to mancozeb suggested that resistance to this fungicide did not occur in the field.",
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T1 - Adaptation of mancozeb by Bipolaris oryzae and B. sorokiniana , the causal organisms of brown spot of wild rice.

AU - Kardin, M K

AU - Percich, JA

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N2 - Isolates of B. oryzae and B. sorokiniana from wild rice (Zizania aquatica ) initially did not grow on potato-dextrose agar (PDA) amended with mancozeb higher than 100 mu b/ml. Resistance of both species ot mancozeb was obtained by transferring repeatedly to media containing increasing concentrations of the fungicide. After eight to nine passages on media amended with increasing concentrations of mancozeb, four isolates of B. oryzae and B. sorokiniana produced colonies that grew at 8,000 mu g/ml of mancozeb. Growth and sporulation of mancozeb-resistant strains of both species on unamended PDA were reduced compared with the wild types. Resistance to mancozeb was lost after subculturing once on fungicide-free media. The similarity of sensitivity of a limited number of isolates of these fungi from fungicide-treated or untreated fields to mancozeb suggested that resistance to this fungicide did not occur in the field.

AB - Isolates of B. oryzae and B. sorokiniana from wild rice (Zizania aquatica ) initially did not grow on potato-dextrose agar (PDA) amended with mancozeb higher than 100 mu b/ml. Resistance of both species ot mancozeb was obtained by transferring repeatedly to media containing increasing concentrations of the fungicide. After eight to nine passages on media amended with increasing concentrations of mancozeb, four isolates of B. oryzae and B. sorokiniana produced colonies that grew at 8,000 mu g/ml of mancozeb. Growth and sporulation of mancozeb-resistant strains of both species on unamended PDA were reduced compared with the wild types. Resistance to mancozeb was lost after subculturing once on fungicide-free media. The similarity of sensitivity of a limited number of isolates of these fungi from fungicide-treated or untreated fields to mancozeb suggested that resistance to this fungicide did not occur in the field.

KW - resistance

KW - brown spot

KW - Bipolaris oryzae

KW - Zizania aquatica

KW - mancozeb

KW - Bipolaris sorokiniana

KW - A 01026:Gramineous crops

KW - Microbiology Abstracts A: Industrial & Applied Microbiology

KW - K 03089:Fungi: plant

KW - Microbiology Abstracts C: Algology, Mycology & Protozoology

KW - A 01064:Microbial resistance

M3 - Article

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SP - 477

EP - 480

JO - Plant Disease

JF - Plant Disease

SN - 0191-2917

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ER -