Role of Nutrition in the Immunity of Red Raspberry to Amphorophora agathonica Hottes 12

1975 ◽  
Vol 4 (1) ◽  
pp. 115-119 ◽  
Author(s):  
G. G. Kennedy ◽  
G. A. Schaefers
Keyword(s):  
Red Raspberry ◽  
Amphorophora Agathonica

Location of the Mechanism of Resistance to Amphorophora agathonica (Hemiptera: Aphididae) in Red Raspberry

2012 ◽  
Vol 105 (4) ◽  
pp. 1465-1470 ◽  
Author(s):  
D. M. Lightle ◽  
M. Dossett ◽  
E. A. Backus ◽  
J. C. Lee
Keyword(s):  
Red Raspberry ◽  
Mechanism Of Resistance ◽  
Amphorophora Agathonica

scholarly journals Biotypic Diversity and Resistance to the Raspberry Aphid Amphorophora agathonica in Pacific Northwestern North America

2012 ◽  
Vol 137 (6) ◽  
pp. 445-451 ◽  
Author(s):  
Michael Dossett ◽  
Chaim Kempler
Keyword(s):  
British Columbia ◽  
North America ◽  
North American ◽  
Rubus Idaeus ◽  
Red Raspberry ◽  
Sources Of Resistance ◽  
Breeding Programs ◽  
Production Region ◽  
Northwestern North America ◽  
Amphorophora Agathonica

Resistance to colonization by the raspberry aphid (Amphorophora agathonica Hottes) has been an important objective in North American red raspberry (Rubus idaeus L.) breeding programs since the 1930s because of its effectiveness in controlling the spread of aphid-transmitted viruses in red raspberry. The most widely used source of resistance in North America has been the gene Ag1 from ‘Lloyd George’. The widespread use of Ag1 to control aphids led to the appearance of a resistance-breaking biotype in British Columbia, Canada, in 1990. Our objective was to identify biotypes of A. agathonica present in the commercial red raspberry production region of southwestern British Columbia and northwestern Washington and determine what sources of resistance may still be effective against this pest. We collected 12 aphid isolates and screened them against 15 raspberry cultivars and four selections. Although it has been widely believed that only two biotypes (regular and Ag1-breaking) of A. agathonica were present in the region, we identified six distinct biotypes and characterized them by their ability or inability to colonize a differential set of raspberry cultivars. This has confirmed the loss of previously recognized and unrecognized sources of resistance in some cultivars. The data also support the presence of a seventh biotype that has not yet been observed. In addition, we confirmed resistance from three sources of wild North American red raspberries that hold up to each of these biotypes. Our results will serve as a guide for future efforts to characterize the prevalence of different aphid biotypes in the region and the identification of new sources of resistance for breeding.

The Role of Ethylene in the Shedding of Red Raspberry Fruit

1990 ◽  
Vol 66 (1) ◽  
pp. 111-120 ◽  
Author(s):  
J. N. BURDON ◽  
R. SEXTON
Keyword(s):  
Red Raspberry

SEARCH FOR BIOLOGICAL RACES IN AMPHOROPHORA AGATHONICA HOTTES ON RED RASPBERRIES

1971 ◽  
Vol 51 (2) ◽  
pp. 81-85 ◽  
Author(s):  
R. H. CONVERSE ◽  
HUGH A. DAUBENY ◽  
R. STACE-SMITH ◽  
LOUISE M. RUSSELL ◽  
E. J. KOCH ◽  
...  
Keyword(s):  
Natural Populations ◽  
Statistical Analyses ◽  
Red Raspberry ◽  
Amphorophora Agathonica

The red raspberry cultivars ’Latham,’ ’Viking,’ ’Newburgh,’ ’Willamette,’ ’Sumner,’ ’Rideau’ and ’Lloyd George’ were tested for their differential abilities to support colonies of the aphid Amphorophora agathonica. These cultivars were grown at Agassiz, B.C. and Burlington, Vt., and counts of the natural populations of A. agathonica that developed on each cultivar except Lloyd George were subjected to statistical analyses. Latham, Viking, and Newburgh differed significantly in relative numbers of aphids between the two locations. The numbers on Willamette and Sumner were relatively similar. Rideau and Lloyd George were immune at each location. This suggests that the populations at the two locations belonged to the same race with respect to their ability to colonize red raspberry cultivars. The differences observed in Latham, Viking, and Newburgh might relate to variations in genotypes of the race.

scholarly journals Pruning Date and Cane Density Affect Primocane Development and Yield of `Autumn Bliss' Red Raspberry

HortScience ◽  
2004 ◽  
Vol 39 (3) ◽  
pp. 520-524 ◽  
Author(s):  
Pedro B. Oliveira ◽  
Cristina M. Oliveira ◽  
António A. Monteiro
Keyword(s):  
Environmental Factor ◽  
Plant Productivity ◽  
Rubus Idaeus ◽  
High Density ◽  
Assimilation Rate ◽  
Light Conditions ◽  
Red Raspberry ◽  
Low Light ◽  
Carbohydrate Reserves

The aim of this study was to determine the effects of date of summer pruning and cane densities on growth and fruiting characteristics of the raspberry (Rubus idaeus) plant. Three summer-pruning dates (early, middle, and late July) and four cane densities (8, 16, 24, and 32 canes/m row) were imposed to the greenhouse-grown primocane-fruiting raspberry `Autumn Bliss' in 2 consecutive years (1994 and 1995). A higher light microclimate and CO2 assimilation rate were measured within the canopy at the lowest density. Some compensation in CO2 assimilation rates were observed in the upper leaves of the high-density treatments, probably in response to low light. Delayed pruning decreased yield per cane and per row. The highest yields per cane were always observed at the lowest cane density. Densities of 16 and 24 canes/m produced the highest fruit yield. Light conditions appeared to be the most important environmental factor affecting plant productivity. Fruit were a weaker sink than roots; therefore, the role of carbohydrate reserves should be investigated.

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