Early selection for partial resistance to powdery mildew, Podosphaera leucotricha (Ell. et Ev.) Salm, in apple progenies

1994 ◽  
pp. 13-15
Author(s):  
J. Janse ◽  
J. J. Verhaegh ◽  
A. P. M. den Nijs
Keyword(s):  
Powdery Mildew ◽  
Partial Resistance ◽  
Early Selection ◽  
Podosphaera Leucotricha ◽  
Selection For

Podosphaera leucotricha. [Descriptions of Fungi and Bacteria].

1967 ◽  
Author(s):  
J. N. Kapoor
Keyword(s):  
South Africa ◽  
New Zealand ◽  
North America ◽  
Powdery Mildew ◽  
South America ◽  
Geographical Distribution ◽  
Prunus Persica ◽  
Podosphaera Leucotricha

Abstract A description is provided for Podosphaera leucotricha. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Malus spp., chiefly on M. pumila (apple), peach (Prunus persica), quince (Cydonia ualgaris) and Photinia spp. also attacked (Hirata, 1966). Also reported on almond fruit (43, 2544). DISEASE: Powdery mildew of apple. GEOGRAPHICAL DISTRIBUTION: Africa (? Kenya, Rhodaia, South Africa, Tanzania); Asia (China, India, Israel, Japan, U.S.S.R.); Australia and New Zealand, Europe (widely distributed) North America (Canada and U.S.A.); South America (Argentina, Brazil, Chile, Colombia, Peru). (CMI map 118). TRANSMISSION: Overwinters on host as dormant mycdium in blossom buds. The role of deistothecia in overwintering is doubtful. Spread by wind-borne conidia (Anderson, 1956).

scholarly journals Pre-selection of apple seedlings for partial powdery mildew (Podosphaera leucotricha Ell. et Ev. /Salm./) resistance

2011 ◽  
Vol 50 (No. 2) ◽  
pp. 65-69 ◽  
Author(s):  
J. Blažek
Keyword(s):  
Powdery Mildew ◽  
First Year ◽  
Podosphaera Leucotricha ◽  
Green House ◽  
Healthy State ◽  
The Mean ◽  
Resistant Genotypes ◽  
Different Levels ◽  
Final Selection ◽  
Selection Of

Incidences of powdery mildew were repeatedly evaluated for two years on 1 420 young seedlings of 20 progenies (of different levels of mildew susceptibility) in a green house, and then for 10 years on 642 seedlings in an orchard. Part of the seedlings in the orchard were pre-selected for the characteristic and others not. Except for the first scoring done in the first year, there was no correlation between mildew incidence on individual seedlings in the green house and their mean performance in the orchard. The seedlings with scores above 6 (resistant or tolerant) at the first stage of evaluation in the green house, however, yielded four times more desirable seedlings after final selection in the orchard than the mean of the total. The progenies that had a better healthy state as a whole yielded more partially resistant genotypes than those with low mean scores. Therefore, the progenies that most rapidly develop infestation on the whole lot should be discarded, whereas those that retain a healthy state longer should be subjected to individual selection according to the previous item.

scholarly journals Efficiency of early selection for rotation-aged wood quality traits in radiata pine

2007 ◽  
Vol 64 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Harry X. Wu ◽  
Mike B. Powell ◽  
Junli L. Yang ◽  
Milo Ivković ◽  
Tony A. McRae
Keyword(s):  
Wood Quality ◽  
Radiata Pine ◽  
Early Selection ◽  
Quality Traits ◽  
Selection For

scholarly journals Apple powdery mildew caused by Podosphaera leucotricha: some important features of biology and epidemiology

2009 ◽  
Vol 15 (1-2) ◽  
Author(s):  
I. J. Holb
Keyword(s):  
Powdery Mildew ◽  
Temporal Dynamics ◽  
Host Susceptibility ◽  
Spore Dispersal ◽  
Podosphaera Leucotricha ◽  
Causal Organism ◽  
Disease Symptoms ◽  
Diurnal Patterns ◽  
Basic Features ◽  
Durability Of Resistance

In this review, some important features of biology and epidemiology are summarised for apple powdery mildew (Podosphaera leucotricha). In the first part of the review, the geographical distribution or the pathogen are discussed, then the morphology and taxonomy of the causal organism are described. Disease symptoms or apple powdery mildew are also shown and then host susceptibility/resistance is discussed in relation to durability of resistance. In the second part of this review, the general disease cycle of powdery mildew on apple are demonstrated and some basic features of powdery mildew epidemiology (such response of the pathogen to temperature, relative humidity, and rain as well as spore production, spore dispersal, diurnal patterns and temporal dynamics of the pathogen/disease) are also given on apple host.

Sign in / Sign up

Export Citation Format

Share Document