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Production of telia by Cronartium flaccidum from infections with aecidiospores and with urediospores

, : Production of telia by Cronartium flaccidum from infections with aecidiospores and with urediospores. Phytopathologia Mediterranea 31(2): 123-125

C. flaccidum, the causal agent of blister rust of two-needle pine (Pinus pinaster), develops the telial stage on the lower leaf surface of the intermediate host Vincetoxicum hirundinaria in Jun.-Jul. (sometimes Aug.) along the coast in Italy, and in Aug.-Sep. (sometimes Oct.) in the mountains. In nature, C. flaccidum telia probably require 18-22 d to form. Telia formation is followed 2-3 d later by the germination of basidia and development of basidiospores.

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Related references

Ragazzi A.; Dellavalle Fedi I.; Mesturino L., 1986: Relation between inoculum concentration of cronartium flaccidum aecidiospores and uredia and telia production on vincetoxicum hirundinaria leaves. The Authors have carried out an experiment to test the effect of concentration of inoculum of aecidiospores of Cromartium flaccidum on the production of uredia and telia on leaves of Vincetoxicum hirundineria. The trials were carried out under con...

Ragazzi, A.; Dellavalle Fedi, I.; Mesturino, L., 1989: The effects of some variables on the production of uredia and telia of Cronartium flaccidum. The effects of inoculum type, leaf age and temp. on the production of uredia and telia of C. flaccidum were studied on Vincetoxicum hirundinaria, the secondary host of this pine pathogen in Italy. Urediospores were the best source of inoculum, the...

Ragazzi A.; Dellavalle Fedi I.; Moricca S., 1988: The effects of a dormancy period on the production of telia of cronartium flaccidum. The Authors tested, in the past years, the effects of some parameters: photoperiod, temperature, relative humidity, and light intensity on the Cronartium flaccidum telia production. The results, however, are uncertain. In this work the Authors sub...

Ragazzi, A., 1980: Basidiospore production by Cronartium flaccidum (Alb. et Schw.) Wint. telia from two different sources. Results are presented of studies on isolations from Vincetoxicum officinale, the principal intermediate host of this pine rust, from 2 places, at 1200 m and 10 m above sea level, under 2 sets of conditions (12 degrees -18 degrees C, 80-60% RH and...

Ragazzi, A., 1980: Basidiospores production by Cronartium flaccidum (Alb. et Schw.) Wint. telia of two different sources. Phytopathologia mediterranea 19(2-3): 139-140

Ragazzi, A., 1976: Preliminary tests on the germination of aecidiospores of Cronartium flaccidum (Alb. & Schw.) Wint. Aecidiospores collected from Pinus pinea germinated at 5-30 deg C, opt. 15 deg . Germination was poor at 20-25 deg and nil at 35 deg . It began 1-2 h after incubation. Each spore generally produced 1 germ tube, sometimes 2. The percentage germinat...

Ragazzi, A., 1982: Variability in the dimensions of aecidiospores and basidiospores of Cronartium flaccidum (Alb. & Schw.) Wint. in relation to the period of sampling. Statistical analyses were applied to detect variations in the size of aeciospores and basidiospores of the pine rust over the years and with the time of the year and of the day.

Kaitera, J.; Nuorteva, H., 2003: Cronartium flaccidum produces uredinia and telia on Melampyrum nemorosum and on Finnish Vincetoxicum hirundinaria. Uredinia and telia were produced on Melampyrum nemorosum through inoculations with Cronartium flaccidum aeciospores collected from northern Finland, proving that M. nemorosum serves as the telial host of C. flaccidum. Melampyrum nemorosum plants w...

Ragazzi, A.; Fagnani, A.; Fedi, I.D., 1986: Morphological features of Cronartium flaccidum urediospores; a light (LM) and scanning electron microscopy (SEM) observations. The Authors have carried out a series of observations by light microscopy (LM) and scanning electron microscopy (SEM) on the morphological features of Cronartium flaccidum urediospores to compare the Italian blister rust with other species of genu...

Shikov, L.S.; Kondakov, S.Y., 2001: The state of pine plantations in foci of Cronartium flaccidum infections. Epidemics of C. flaccidum are reported from pine forests in the Krasnoyarsk region, Siberia, Russia. Eradication of all diseased trees when 20-30% of trees show infection is recommended as a reliable method of control.