Proven Performance Trials 2017 - Page 4

Disease Resistance

Disease Resistance

The availability of disease resistance traits through leading genetic packages is an important tool in managing canola rotations for long term sustainability of the crop . Blackleg , sclerotinia and , more recently , clubroot have become high priority issues when selecting a canola hybrid .
Blackleg
Blackleg resistance has been available in commercial varieties since the early 1990s . However , in recent years , the virulence of the blackleg fungus has been shifting , resulting in the breakdown of resistance in many traditional canola varieties . Multigenic resistance , which is available in all canola varieties sold in Western Canada , is a combination of qualitative and quantitative genes and is the best and most durable form of blackleg resistance . CPS plant breeders are constantly testing and incorporating the most effective genes into Proven Seed canola hybrids .
Sclerotinia
The recent introduction of varieties with some physiological tolerance to sclerotinia is another management tool for growers . These varieties have demonstrated a significant ability to reduce sclerotinia severity in the field and protect yield in years with average disease pressure , although a fungicide application may still be warranted depending on the conditions .
Clubroot
Clubroot is quickly spreading across the Prairies . CPS is proud to offer clubroot-resistant canola varieties that carry genetics which result in a reduction of disease to less than 30 per cent of a fully susceptible variety . Resistance does not mean that the variety is immune to the disease and some galls may still be produced if the disease is present in the field . Single-gene resistant varieties , which are effective against the predominant strains , can be grown in areas with low levels or no clubroot to keep spore levels low . These varieties should not be grown repeatedly in a short rotation as it increases the speed of which a shift towards a more virulent strain will occur . Two-gene resistant varieties , which have more than one resistance gene , offer additional protection , reduce selection pressure and enable resistance to remain durable for longer . These varieties are an excellent tool to rotate genetics where current clubroot hybrids are still effective but the risk of becoming susceptible is still high .
VARIETY
BLACKLEG
CLUBROOT
SCLEROTINIA
PV 200 CL
R
S
S
PV 531 G
R
S
S
PV 533 G
R
S
S
PV 540 G
R
S
S
PV 560 GM
R
S
S
PV 581 GC
R
Single-gene
S
PV 585 GC
R
Two-gene
S
PV 590 GCS
R
Single-gene
T
R = Resistant T = Tolerant S = Susceptible
LPC Summary
β€’ Hybrids with lower standability ratings are typically easier and faster to swath . This can lead to time savings in the field , and the ability to manage acres more effectively and efficiently .
β€’ Yield potential can be maximized by selecting the right hybrids for the farm based on genetic potential , standability , days to flower and maturity .
β€’ Environmental factors cannot be controlled , only managed . Seeding a variety of high-yielding hybrids increases the likelihood of attaining optimum returns . Disease resistance and tolerance is one tool in a sound canola disease management system ; rotations and field hygiene best practices are others .
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Disease Resistance The availability of disease resistance traits through leading genetic packages is an important tool in managing canola rotations for long term sustainability of the crop. Blackleg, sclerotinia and, more recently, clubroot have become high priority issues when selecting a canola hybrid. Blackleg Blackleg resistance has been available in commercial varieties since the early 1990s. However, in recent years, the virulence of the blackleg fungus has been shifting, resulting in the breakdown of resistance in many traditional canola varieties. Multigenic resistance, which is available in all canola varieties sold in Western Canada, is a combination of qualitative and quantitative genes and is the best and most durable form of blackleg resistance. CPS plant breeders are constantly testing and incorporating the most effective genes into Proven Seed canola hybrids. Sclerotinia The recent introduction of varieties with some physiological tolerance to sclerotinia is another management tool for growers. These varieties have demonstrated a significant ability to reduce sclerotinia severity in the field and protect yield in years with average disease pressure, although a fungicide application may still be warranted depending on the conditions. Clubroot Clubroot is quickly spreading across the Prairies. CPS is proud to offer clubroot-resistant canola varieties that carry genetics which result in a reduction of disease to less than 30 per cent of a fully susceptible variety. Resistance does not mean that the variety is immune to the disease and some galls may still be produced if the disease is present in the field. Single-gene resistant varieties, which are effective against the predominant strains, can be grown in areas with low levels or no clubroot to keep spore levels low. These varieties should not be grown repeatedly in a short rotation as it increases the speed of which a shift towards a more virulent strain will occur. Two-ge Ή”Ι•Ν₯ΝΡ…ΉΠΩ…Ι₯•Ρ₯•Μ°έ‘₯ ‘…Ω”΅½Ι”Ρ‘…Έ½Ή”)Ι•Ν₯ΝΡ…Ή”•Ή”°½™™•Θ…‘‘₯Ρ₯½Ή…°ΑΙ½Ρ•Ρ₯½Έ°Ι•‘Ս”Ν•±•Ρ₯½ΈΑΙ•ΝΝΥΙ”…Ή•Ή…‰±”Ι•Ν₯ΝΡ…Ή”ΡΌΙ•΅…₯Έ‘ΥΙ…‰±”™½Θ±½Ή•ΘΈQ‘•Ν”Ω…Ι₯•Ρ₯•Μ…Ι”…Έ)•α•±±•ΉΠΡ½½°ΡΌΙ½Ρ…Ρ”•Ή•Ρ₯Μέ‘•Ι”ΥΙΙ•ΉΠ±Υ‰Ι½½Π‘ε‰Ι₯‘́…Ι”ΝΡ₯±°•™™•Ρ₯Ω”‰ΥЁё”Ι₯Ν¬½˜‰•½΅₯ΉœΝΥ͍•ΑΡ₯‰±”₯́ΝΡ₯±°‘₯ Έ)YI%Qd 1 -1 1U I==PM 1I=Q%9%)AX€Θΐΐ 0HLL)AX€ΤΜāHLL)AX€ΤΜ́HLL)AX€ΤΠΐHLL)AX€ΤΨΐ4HLL)AX€Τΰā HM₯Ή±”΅•Ή”L)AX€Τΰԁ HQέΌ΅•Ή”L)AX€Τδΐ LHM₯Ή±”΅•Ή”P)HτI•Ν₯ΝΡ…ΉΠP€τQ½±•Ι…ΉΠL€τMΥ͍•ΑΡ₯‰±”)1A MΥ΅΅…Ιδ+Šˆ$!ε‰Ι₯‘́έ₯Ρ ±½έ•ΘΝΡ…Ή‘…‰₯±₯ΡδΙ…Ρ₯ΉΜ…Ι”ΡεΑ₯…±±δ•…Ν₯•Θ…Ή™…ΝѕȁѼΝέ…Ρ ΈQ‘₯́…Έ±•…ΡΌΡ₯΅”Ν…Ω₯ΉΜ₯ΈΡ‘”™₯•±°…ΉΡ‘”…‰₯±₯Ρδ)ΡΌ΅…Ή…”…Ι•Μ΅½Ι”•™™•Ρ₯Ω•±δ…Ή•™™₯₯•ΉΡ±δΈ+Šˆ$e₯•±Α½Ρ•ΉΡ₯…°…Έ‰”΅…α₯΅₯镐‰δΝ•±•Ρ₯ΉœΡ‘”Ι₯‘Ё‘ε‰Ι₯‘́™½ΘΡ‘”™…Ι΄‰…Ν•½Έ•Ή•Ρ₯ŒΑ½Ρ•ΉΡ₯…°°ΝΡ…Ή‘…‰₯±₯Ρ䰁‘…έѼ™±½έ•Θ…Ή΅…ΡΥΙ₯ΡδΈ+Šˆ$ΉΩ₯Ι½Ή΅•ΉΡ…°™…Ρ½Ί…ΉΉ½Π‰”½ΉΡΙ½±±•°½Ή±δ΅…Ή…•ΈM••‘₯Ήœ„Ω…Ι₯•Ρ䁽˜‘₯ ΅ε₯•±‘₯Ήœ‘ε‰Ι₯‘́₯ΉΙ•…͕́ё”±₯­•±₯‘½½½˜…ΡΡ…₯Ή₯Ήœ)½ΑΡ₯΅Υ΄Ι•ΡΥΙΉΜΈ₯Ν•…Ν”Ι•Ν₯ΝΡ…Ή”…ΉΡ½±•Ι…Ή”₯́½Ή”Ρ½½°₯Έ„Ν½ΥΉ…Ή½±„‘₯Ν•…Ν”΅…Ή…•΅•ΉΠΝεΝΡ•΄μΙ½Ρ…Ρ₯½ΉΜ…Ή™₯•±‘ε₯•Ή”)‰•ΝЁΑΙ…Ρ₯•Μ…Ι”½Ρ‘•ΙΜΈ(Π