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Netherlands Journal of Plant Pathology

, Volume 95, Supplement 1, pp 175–185 | Cite as

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

  • R. E. Stuckey
  • J. C. Zadoks
Article

Abstract

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.

Samenvatting

Kiemplanten van het vatbare tarweras Rubis werden geïnoculeerd met uredosporen van de bruine roest van tarwe. De proeven vonden plaats in klimaatkamers. Geïnoculeerde planten werden geïncubeerd in incubatiehokjes met een zeer hoge luchtvochtigheid, teneinde condensatiedruppels op de bladeren en aldus bladnatperioden te krijgen. De toegediende bladnatperioden varieerden in tijdsduur en zij verliepen met of zonder één of meer onderbrekingen, ook weer van variërende duur. Tijdens de onderbrekingen stonden de planten met roestkiemlingen in het licht; het blad was dan droog. Bij ongeveer optimale temperatuur en bladnatperioden van 6 uur was het aantal verkregen puistjes 60 à 65% van het aantal verkregen puistjes na een bladnatperiode van 12 of 24 uur. Onderbreking van de 6-urige bladnatperiode door een 1-urige droge periode was voor de roestkiemlingen het schadelijkst ongeveer 3 tot 4 uur na inoculatie. De schade kwam tot uitdrukking in het kleinere aantal geproduceerde puistjes en in een verlenging van de mediane latentieperiode. De epidemiologische betekenis van onderbrekingen van de bladnatperiode wordt besproken.

Additional keywords

germination latency period pustulation uredinia urediniospores 

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References

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 1989

Authors and Affiliations

  • R. E. Stuckey
    • 1
  • J. C. Zadoks
    • 2
  1. 1.Laboratory of PhytopathologyUniversity of KentuckyLexingtonUSA
  2. 2.Department of Plant PathologyWageningen Agricultural UniversityWageningenthe Netherlands

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