Detection of resistance to fungicides, mating types and fitness of Phytophthora infestans in Hebei, China

In vitro, isolates resistant to metalaxyl (M) and oxadixyl (O) of Phytophthora infestans were 11.2% of 62 isolates from potato and tomato in Hebei Province, mean resistance factor was 15,022 fold and 24,733 fold, respectively, no isolates resistant either to cymoxanil (C) or to dimethomorph (D) were...

Full description

Saved in:
Bibliographic Details
Published inMededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Vol. 67; no. 2; p. 307
Main Authors Wang, Wen-Qiao, Ma, Zhi-Qiang, Han, Xiu-Ying, Zhang, Xiao-Feng, Chen, Shu-Long
Format Journal Article
LanguageEnglish
Published Belgium 2002
Subjects
Acetamides - metabolism
Acetamides - pharmacology
Alanine - analogs & derivatives
Alanine - metabolism
Alanine - pharmacology
China
Culture Techniques
Drug Resistance, Fungal
Fungicides, Industrial - metabolism
Fungicides, Industrial - pharmacology
Lycopersicon esculentum - microbiology
Morpholines - pharmacology
Oxazoles - metabolism
Oxazoles - pharmacology
Phytophthora - drug effects
Phytophthora - isolation & purification
Phytophthora - metabolism
Plant Diseases - microbiology
Solanum tuberosum - microbiology
Spores, Fungal - drug effects
Spores, Fungal - growth & development
Online AccessGet more information

Cover

More Information
Summary:In vitro, isolates resistant to metalaxyl (M) and oxadixyl (O) of Phytophthora infestans were 11.2% of 62 isolates from potato and tomato in Hebei Province, mean resistance factor was 15,022 fold and 24,733 fold, respectively, no isolates resistant either to cymoxanil (C) or to dimethomorph (D) were detected. On the other hand, in vivo, isolates resistant to M and O were 29.0% and 32.7%, respectively, among 217 isolates from potato plants in Weichang and Chongli, Hebei, only one isolate resistant to M and O was found among 88 isolates from tomato plants in Xushui, Hebei. Among 73 isolates from potato in Weichang and Chongli, 6 isolates with A2 mating type were 8.2%, 3 A2 isolates resistant to metalaxyl and oxadixyl. 3 A2 isolates were 6.8% of 44 isolates from tomato in Xushui. Cross resistance in Phytophthora infestans was confirmed between M and O, but no cross resistance between C or D and M or O. The field isolates resistant to M and O were outstandingly fitter than sensitive or intermediate ones, mainly due to stronger sporulation capacity of the field isolates.
ISSN:1373-7503