Effect of temperature and uredinium density on urediniospore production, latent period, and infectious period of<i>Puccinia hordei</i>Otth

Teng, P. S.; Close, R. C.

doi:10.1080/00288233.1978.10427413

Cited by 41 publications

(32 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A part of the fleck and pustule delay may have been due to the density of successful fungal penetrations. Greater density of infections are known to decrease the latency period (Mehta and Zadoks, 1970;Teng and Close, 1978). However, not all of the delay can be attributed to density since terminal pustule numbers were approximately the same for all treatments whose interruption time began at 2 h after inoculation (Table 1).…”

Section: Discussionmentioning

confidence: 95%

Effect of interrupted leaf wetness periods on pustule development of Puccinia recondita f. sp. tritici on wheat

Stuckey

Zadoks

1989

Netherlands Journal of Plant Pathology

View full text Add to dashboard Cite

In growth chamber experiments, seedlings of a susceptible wheat cultivar (Rubis) were inoculated with urediospores of wheat leaf rust. Inoculated seedlings were incubated in a moist chamber. The period of exposure to leaf wetness varied in duration and progressed with or without one or more interruptions of variable duration. During the interruptions the leaves with germlings were dry. At near-optimal temperature, leaf wetness periods of six h resulted in 60 to 65~ of the pustules produced with 12 or 24 h wetness periods. Interruption of a 6 h leaf wetness period by a 1 h dry period was most damaging to the rust germlings at about three to four h after inoculation. The damage became visible as a reduction in the number of resulting pustules and as a prolongation of the median latency period. Epidemiological implications of leaf wetness interruptions are discussed.

show abstract

Section: Discussionmentioning

confidence: 95%

Effect of interrupted leaf wetness periods on pustule development of Puccinia recondita f. sp. tritici on wheat

Stuckey

Zadoks

1989

Netherlands Journal of Plant Pathology

View full text Add to dashboard Cite

show abstract

“…At higher inoculum densities, infection efficiency tended to decrease as more spores were applied. In P. hordei (Teng & Close, 1978), infection efficiency increased from 0·14 to 0·36 when inoculum densities increased from 7 to 446 spores cm −2 . The stimulating effects of mass spores on mycelial growth have been observed in some rust fungi in attempts to establish axenic cultures from the spores.…”

Section: Discussionmentioning

confidence: 97%

Quantitative relationships between inoculum of Melampsora larici‐epitea and corresponding disease on Salix

Pei¹,

Ruiz²,

Hunter³

et al. 2002

Plant Pathology

View full text Add to dashboard Cite

Six Salix clones were inoculated with urediniospores of four isolates of Melampsora larici-epitea at five inoculum levels using a leaf-disc method. Disease reactions were recorded using a digital camera; the number and size of uredinia were examined using image analysis software; and spore yield per leaf disc was measured. In three Salix / Melampsora combinations, S. × mollissima 'Q83'/Q1 (LET4); S. viminalis '78183'/ V1 (LET1); and S. × stipularis / V1, pustule numbers increased as inoculum density became higher. In the remainder, S. viminalis 'Mullatin'/ V1; S. × calodendron /DB (LET3); and S. burjatica 'Korso'/ K (LR1), pustule numbers initially increased, then decreased as inoculum densities exceeded 140 -360 spores per disc. Calculated infection efficiency ranged from 0·11 to 0·20 on the three willows inoculated with V1: 0·16 -0·68 for S. × calodendron / DB; 0·20 -0·55 for 'Q83'/Q1; and 0·07 -0·48 for Korso / K. In single-spore inoculations, up to 10% of spores produced single uredinia. Infection efficiency increased sharply between inoculum densities of 1-40 spores per leaf disc. Spore yield was more closely correlated to pustule area (accounting for 61·2% variance for the combined data) than to the number of pustules (42·7% variance). For spore yields in relation to pustule numbers, clone-specific individual lines having different intercepts and slopes fitted significantly better than either a single line for all the tested willows, or parallel lines fitted to each clone ( P < 0·001). For spore yields in relation to pustule area, clonespecific individual parallel lines were significantly better than a single line ( P < 0·001).

show abstract

“…The combination of the successive sub-components (processes) described in Figures 2-7 results in Figure 9, which gives an overview of the basic monocycle components (Teng and Close, 1978;Zadoks and Schein, 1979) of ALS epidemics. Factors influencing rates have been removed from the diagram in order to retain the main features of the processes themselves.…”

Section: Structure Of a Systems Modelmentioning

confidence: 99%

Epidemiological Characteristics of Angular Leaf Spot of Bean: A Systems Analysis

Allorent

Savary

2005

Eur J Plant Pathol

View full text Add to dashboard Cite

In this review, available knowledge on angular leaf spot (ALS) of bean, caused by Phaeoisariopsis griseola, is analysed and synthesised. This is done through a systems-analytical approach, and successive flowcharts of the system, in order to identify knowledge gaps and guide further research. Six connected sub-models of the ALS monocycle are used as a framework: lesion establishment, lesion extension, defoliation, sporulation, spore liberation, and spore deposition. Each of the sub-models enables the linking of processes to various effects of environmental (physical and host) factors. Disease-induced defoliation is one feature of the pathosystem, leading to a depletion of infectious tissues from the canopy, which are transferred to the ground. Consequences of defoliation may include: strong reductions of the amount of inoculum and of vacant sites in the canopy, limited maximum disease severity, and progressive accumulation of inoculum below the canopy, which may become important a later stage of disease epidemics. These elements are hypothesised to explain the typical behaviour of ALS epidemics in the field, especially late onset, high apparent rate of disease increase, and low level of terminal disease severity in the standing canopy. Epidemiological consequences of lesion expansion, sporulation, and survival of spores deposited onto the canopy are other knowledge gaps in this pathosystem.

show abstract

Effect of temperature and uredinium density on urediniospore production, latent period, and infectious period ofPuccinia hordeiOtth

Cited by 41 publications

References 13 publications

Effect of interrupted leaf wetness periods on pustule development of Puccinia recondita f. sp. tritici on wheat

Effect of interrupted leaf wetness periods on pustule development of Puccinia recondita f. sp. tritici on wheat

Quantitative relationships between inoculum of Melampsora larici‐epitea and corresponding disease on Salix

Epidemiological Characteristics of Angular Leaf Spot of Bean: A Systems Analysis

Contact Info

Product

Resources

About