Environment and sporulation in phytopathogenic fungi. III. Peronospora tabacina Adam: Field environment, sporulation, and forecasting

1961 ◽  
Vol 12 (6) ◽  
pp. 1119 ◽  
Author(s):  
NE Rider ◽  
IAM Cruickshank ◽  
EF Bradley
Keyword(s):  
Phytopathogenic Fungi ◽  
Basic Information ◽  
Peronospora Tabacina ◽  
Laboratory Findings ◽  
Blue Mould ◽  
Field Environment ◽  
Germination Characteristics ◽  
Temperature And Humidity ◽  
Trial Basis ◽  
Spore Dissemination

An account is given of measurements of temperature and humidity at a number of positions and heights within a tobacco crop during a 4 day period. Measurements of the intensity of sporulation of Peronospora tabacina Adam were made at the same time. It is shown that the capacity of P. tabacina to sporulate is controlled not only by nocturnal humidity but also by day temperature. The observations confirm that Cruickshank's laboratory findings hold in the field. The implications of the observations reported here, together with those of other workers on such factors as the spore dissemination and germination characteristics of P. tabacina, are discussed. It is concluded that the basic information necessary to initiate, on a trial basis, a blue mould forecasting and spray warning service is now available.

Fungicides for the control of tobacco blue mould in the field

1964 ◽  
Vol 4 (14) ◽  
pp. 236 ◽  
Author(s):  
RG Paddick
Keyword(s):  
Field Conditions ◽  
Peronospora Tabacina ◽  
Leaf Quality ◽  
Blue Mould ◽  
Wide Range ◽  
The Absolute

A wide range of fungicides and antibiotics was tested under field conditions for control of blue mould of tobacco (Peronospora tabacina Adam). Zineb and maneb, used at weekly intervals, have given consistently good results without adversely affecting leaf quality. Heavy atmospheric spore loads reduced the absolute affectiveness of the fungicides but the trend towards higher yields of saleable leaf was maintained. Best control throughout the season was obtained with zineb spray from transplanting to early January and subsequently zineb dust to the beginning of harvest. Results with maneb were not significantly different from those with zineb.

scholarly journals Microbiology and Biochemistry of PtA-Resistance/Zur Mikrobiologie und Biochemie der Peronosporaresistenz

1972 ◽  
Vol 6 (5) ◽  
Author(s):  
J.A. Schmidt
Keyword(s):  
The State ◽  
Vitamin B ◽  
Reciprocal Effects ◽  
High Quality ◽  
Peronospora Tabacina ◽  
Third Way ◽  
Blue Mould ◽  
Resistant Strains

AbstractSince 1960 the blue mould disease caused by Peronospora tabacina Adam (PtA) and which leads to considerable losses, has been occurring epidemically in tobacco grown in Europe and parts of Asia and Africa. All varieties cultivated are susceptible to this fungus, which is an inevitable tobacco parasite, and must either be protected prophylactically by weekly spraying with dithiocarbamate, which leaves residues, or be replaced by new, PtA-resistant strains based on wild forms of Nicotiana. In investigations of our own - published in 5 parts in the "Zeitschrift fuer Naturforschung" - the fundaments of a third way of combatting this disease were worked out using the very PtA-susceptible German, high-quality strains "Badischer Geudertheimer'', ''Badischer Burley E'' and "Virgin SCR''. This present paper contains, summarized, the state of this work at the end of 1971. It was observed that the PtA-resistant hybrid strains (U. S. Bel.-61 types) were also infected by PtA, but this infection was stopped by the synthesis of antibodies, and that there are reciprocal effects of the substances triggering off resistance and microorganisms. The antibodies were separated out electrophoretically, established chemically and ascertained to be nucleoproteid or nucleotides, and to be an alloxazin compound closely related to vitamin B

Glasshouse and field experiments on the control of tobacco blue mould

1963 ◽  
Vol 3 (10) ◽  
pp. 209
Author(s):  
BS Janes ◽  
J Kuiper
Keyword(s):  
Field Experiments ◽  
Simple Procedure ◽  
Field Trials ◽  
Effective Control ◽  
Peronospora Tabacina ◽  
Blue Mould ◽  
Highly Effective ◽  
Tobacco Seedlings

A simple procedure is described for the testing of chemicals against blue mould (Peronospora tabacina Adam) on tobacco seedlings in the glasshouse. Of approximate/y 500 chemicals tested, 17 gave mould control comparable to that of the standard (0.1 per cent w/v zineb), but a number of these were phytotoxic. In two field trials, zineb and ethylenethiuram monosulphide as dispersible powders or suspensions in white spraying oil base and N-p-tolyl dichloromaleimide as a dispersible powder, gave highly effective control early in the season, but later in the season, only zineb at 0.1 and 0.2per cent w/v gave effective control. Maneb, which was not tested in the field, later proved consistently superior to zineb in extensive glasshouse trials, and appeared to be the most promising compound for further investigation.

The role of temperature in the development of blue mould (Peronospora tabacina Adam) disease in tobacco seedlings. I. In leaves

1965 ◽  
Vol 16 (4) ◽  
pp. 597 ◽  
Author(s):  
AV Hill ◽  
S Green
Keyword(s):  
Narrow Range ◽  
Peronospora Tabacina ◽  
Progressive Development ◽  
Blue Mould ◽  
Temperature Conditions ◽  
Strong Trend ◽  
Slow Development ◽  
Wide Range ◽  
Tobacco Seedlings

In tests over a wide range of temperature conditions the number of days from inoculation of plants of cv. Virginia Gold with conidia of Peronospora tabacina to appearance of blue mould symptoms in leaves varied from 4 to 12 days with conidia of strain APT1 and from 5 to 15 days with strain APT2. It was 4 to 14 days with strain APT2 on plants of cv. SO1. Initial death of leaves of cv. Virginia Gold occurred at 5–6 days after inoculation with APT1 but 3–4 days later when similar plants or cv. SO1 were inoculated with APT2. For each strain there was a strong trend toward similar leaf loss, and similar progressive development of leaf loss in treatments with the same night temperatures. For both strains, leaf losses developed most rapidly and were most severe at night temperatures of 16–24°C. The relatively slow development of APT2, except over a narrow range of temperatures, would limit its capacity for competing with APT1 and for producing epiphytotics.

scholarly journals Environment and Sporulation in Phytopathogenic Fungi Li. Conidia Formation in Peronospora Tabacina Adam as a Function of Temperature

1961 ◽  
Vol 14 (2) ◽  
pp. 198 ◽  
Author(s):  
IAM Cruickshank
Keyword(s):  
Incubation Period ◽  
Environmental Temperature ◽  
Phytopathogenic Fungi ◽  
Leaf Disk ◽  
Peronospora Tabacina ◽  
Response To Temperature

Using a leaf-disk technique an analysis was carried out to study the effect of environmental temperature on the length of the incubation period and sporulation intensity of P. tabacina. An analysis was also made of the sporulation response to temperature treatments prior to and during sporulation. The following points were demonstrated:

scholarly journals Environment and Sporulation in Phytopathogenic Fungi I. Moisture in Relation to the Production and Disoharge of Conidia of Peronospora Tabaoina Adam

1958 ◽  
Vol 11 (2) ◽  
pp. 162 ◽  
Author(s):  
IAM Cruickshank
Keyword(s):  
Water Relations ◽  
Phytopathogenic Fungi ◽  
Peronospora Tabacina ◽  
Tobacco Leaf ◽  
Leaf Disks

In an investigation into the effects of water relations on sporulation of Peronospora tabacina Adam in tobacco leaf disks the following results were obtained:

Disease resistant flue-cured tobacco breeding lines for north Queensland I. Resistance to blue mould, Peronospora tabacina

1977 ◽  
Vol 17 (87) ◽  
pp. 652 ◽  
Author(s):  
FEM Gillham ◽  
DC Wark ◽  
EKS Harrigan
Keyword(s):  
Doubled Haploids ◽  
Peronospora Tabacina ◽  
Breeding Lines ◽  
Blue Mould ◽  
The North ◽  
Commercial Cultivars ◽  
Screening For Resistance ◽  
Nicotiana Debneyi ◽  
Serious Disease ◽  
Different Sources

Blue mould, Peronospora tabacina Adam., is the most serious disease of tobacco in north Oueensland. Two cultivars were released in 1969 and one in 1972 which were resistant to the north Queensland strain of blue mould, APTI. During 1972 and 1973, a new strain of mould, APT2, became established in the area. The APT1 resistant cultivars, which carried resistance from Nicotiana debneyi or N. goodspeedii, were susceptible to APT2. Breeding lines carrying blue mould resistance from these species and from N. exigua, N. velutina or N. excelsior were introduced for screening for resistance to the new strain of mould. Some of these lines had been developed by backcrossing and selection, some from crosses between lines carrying resistance from different sources and others by following backcrossing by production of doubled haploids through anther culture. Following the screening of these lines for blue mould resistance and for commercial attributes, three backcross lines, three double haploid lines and one line carrying resistance from two sources were selected for further screening as potential commercial cultivars.

Sign in / Sign up

Export Citation Format

Share Document