The influence of seedling age and development on the infection of lettuce byBremia lactucae
作者:
C. H. DICKINSON,
I. R. CRUTE,
期刊:
Annals of Applied Biology
(WILEY Available online 1974)
卷期:
Volume 76,
issue 1
页码: 49-61
ISSN:0003-4746
年代: 1974
DOI:10.1111/j.1744-7348.1974.tb01356.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
SUMMARYLaboratory methods are described for the culture and observation ofBremia lactucaeon lettuce.Mycelial growth of the fungus within the cotyledons of the cultivar Cheshunt Early Giant progressed to a minimum density at which sporulation occurred, and then continued to a maximum density coinciding with peak sporulation. The timing and intensity of sporulation was influenced by the concentration of the inoculum. Seedlings often became systemically infected and this, together with intensity of sporulation, was a good indicator of fungal growth and hence host susceptibility.The severity of disease development on four susceptible lettuce cultivars (Cheshunt Early Giant, Paris White, Trocadero Improved and Crackling Ice) decreased with age and development of the seedlings at inoculation. The reasons for this are discussed.
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