Biological characteristics of Gymnosporangium asiaticum f.sp. crataegicola
Experiments carried out at the Shenyang Agricultural University in China dealt with the determination of biological characteristics of Gymnosporangium asiaticum f.sp. crataegicola (EPPO A1 quarantine pest). It was found that basidiospores were formed when telia absorbed water and gelatinized for one hour, with a maximum formation after 24 hours. The germination of teliospores took place in a temperature range of 5ø - 35ø C with an optimum temperature between 10ø to 25ø C. Basidiospores germinated between 5ø - 25ø C with an optimum at 15ø - 25ø C. The survival of telia was limited to 60 d at room temperature and four months at 5ø C. Teliospores and basidiospores did not survive dry conditions and died within 2 days.
Sources
Wang, K.; Bai, J.K.; Li, D.H.; Deng, G.Y. (1993) Identification and biological characteristics of Gymnosporangium asiaticum Miyabe ex Yamada f. sp. crataegicola infecting hawthorn.
Acta Phytopathologica Sinica 23, 187-192.