Blackleg Management

PHYTOPHTHORA ROOT ROT IN SOYBEAN

Phytophthora root rot (PRR) is a root and stem disease that infects soybean at any stage during plant development The soil-borne pathogen, Phytopthora sojae, remains dormant in the soil for several years and seeks out nearby soybean roots to infect P. sojae thrives in warm, wet soils and can increase in high frequency soybean crop rotations It’s important to utilize an integrated management approach to minimize disease buildup including crop rotation, seed treatments and resistant varieties 1

Variety Resistance

Resistant varieties are one of the most relied upon practices to minimize PRR damage in soybean The two main types of plant host resistance are:

• Major-gene/race-specific resistance (Rps gene):

Single-resistance gene to P. sojae that stops plant infection from occurring Each resistance gene protects against specific races and does not provide overall protection from all races Rps1a, Rps1c, Rps1k, Rps3a and Rps6 are the most common resistance genes

• Quantitative resistance/field tolerance: Consists of multiple genes working together to slow the infection within the plant This resistance will provide protection from any P. sojae race that is trying to invade

Varieties with race-specific resistance are molecular screened to identify the major genes, whereas quantitative resistance is evaluated in the field to determine the level of protection provided A combination of both resistance types is recommended to minimize disease symptoms caused by multiple pathotypes of P. sojae 2

Variety Selection

Growers dealing with PRR or at high risk of the disease should select a variety that targets the predominant races detected within the region This information can be found through provincial soybean disease surveys In fields with a history of PRR, select varieties with enhanced resistance genes and strong field tolerance to target P. sojae races identified For fields at a lower risk of PRR, it’s still recommended to use a resistant variety to minimize potential spread and damage from the pathogen Rotating resistance genes over time minimizes selection pressure and increases longevity of resistance sources to help manage PRR

Image provided by MPSG

1 Manitoba Pulse & Soybean Growers Association (MPSG). (2022) Phytophthora Root

Rot. Available at: https://www.manitobapulse.ca/2020/07/phytophthora-root-rot/ (Accessed on May 5, 2022). 2 McLaren, D.L., Kim, Y.M., Conner, R. (2020). Resistance to Phytophthora Root and Stem Rot in Soybean. Available at: https://www.manitobapulse.ca/2019/06/ resistance-to-phytophthora-root-and-stem-rot-in-soybean/ (Accessed on May 5, 2022).

VENZAR DALTON R E44H12 R SOYBEAN PORTFOLIO

BY BRAVARR2

Industry-Leading VarietiesMANI R2X MARDUK R2X

E49K32 R

E52V92 R

BrettYoung brings premium products specifically suited to growing conditions Lorem ipsum NOCOMAR2 in Western Canada BrettYoung soybeans are high-yielding with a range of characteristics to meet the unique challenges of your farm LASSAR2X

C4M17221 R2

RENUKA R2X YUKON R BY BELMONTFUSION RR RR2 Soybean Portfolio – Summary of Key Characteristics SUNNA R2X

VIDAR R2X

YUKON R

VENZAR

BYM2233005 TR FUSION RR DALTON R NEW

VENZAE44H12 R R BY BR DALTON AVARR2 R E44H12 R MANI R2X NEW

BY BRAVARR2 E49K32 R

Variety Brand System Maturity Pod Height IDC PRR White Mould

SCN Resistant

KARPO R2 Plant/Canopy Type Plant Height Row Spacing Standability Seedling Vigour Hilum Pubescence Flower RX CEDO RX ACRON BY RUNDLE XT

AMIRANI R2

MARDUK R2X BYLOGAN XT NOCOMAR2

Lorem ipsum 000.5 RM 2150 CHU Very Good Semi-tolerant VG Field Resistance (Rps1c/3a genes)

000.5 RM 2150 CHU

000.7 RM 2200 CHU Very Good Semi-tolerant VG Field Resistance (Rps1k gene)

Very Good Semi-tolerant Good Field Resistance (Rps1c gene)

MANI R2X MARDUK R2X

E49K32 R NOCOMAR2 E52V92 R NEW LASSAR2XBY MORRO XT C4M17221 R2

Lorem ipsum 00.1 RM 2300 CHU Very Good Semi-tolerant VG Field Resistance (Rps3b gene)

RENUKA R2X E52V92 R RENUKA R2XBY BELMONT RR2 LASSASUNNA R2X R2X C4M17221VIDAR R2X R2

SUNNA R2X BY BELMONT RR2 VIDAR R2X KARPO R2 RX CEDO BYM2233005 TR RX ACRON

KARPO R2 RX CEDO BY RX ACRONM2233005 TR NEW BYRAINIER XT AMIRANI R2

YUKON R FUSION RR

00.3 RM 2375 CHU Very Good Tolerant VG Field Resistance (Rps1c gene)

00.3 RM 2375 CHU Excellent Tolerant VG Field Resistance (Rps1c gene)

00.5 RM 2425 CHU Very Good Semi-tolerant VG Field Resistance (Rps1c gene)

00.6 RM 2450 CHU Very Good Semi-tolerant VG Field Resistance

RM: Relative maturity; CHU: Corn heat units; IDC: Iron Deficiency Chlorosis; PRR: Phytophthora root rot; white mould: Sclerotinia rot or white mould; AMIRANI R2 SCN: Soybean cyst nematode Excellent (E) > Very Good (VG) > Good (G) > Poor (P)

VENZAR DALTON R E44H12 R Roundup Ready 2 Xtend® System

BY BRAVARR2 Minimize Weeds, Maximize Yields

MARDUK R2XMANI R2X Built on the high-yielding Roundup Ready 2 Yield® soybean technology, Roundup Ready 2 Xtend soybeans are the industry’s first Lorem ipsum NOCOMAR2E49K32 R biotech-stacked soybean trait with both dicamba and glyphosate herbicide tolerance With tolerance to glyphosate and dicamba, farmers will have access to additional tools to help control tough-to-manage broadleaf weeds The technology offers the yield and quality potential that farmers already know and trust from their Roundup Ready 2 Yield soybeans

E52V92 R LASSAR2X C4M17221 R2

For product performance information and trial results, visit brettyoung.ca/Performance.

Very Good Yes Semi-bushy Medium 7–22-inch Excellent Very Good Grey to Black Tawny Purple

Very Good – Semi-bushy Tall 7–22-inch Very Good Excellent Yellow Brown Purple

Very Good Yes Semi-bushy Tall 7–22-inch Very Good Very Good Black Tawny Purple

Very Good Yes Semi-bushy Medium 7–22-inch Excellent Excellent Imperfect Yellow or Pale Grey Pale Brown to Grey Purple

Very Good Yes Bushy Tall 7–30-inch Very Good Excellent Grey Tawny Purple

Very Good – Semi-bushy Medium 7–22-inch Excellent Very Good Imperfect Black Grey Purple

Very Good – Semi-bushy Tall 7–22-inch Very Good Excellent Black Tawny Purple

Good Yes Semi-bushy Tall 7–22-inch Very Good Excellent Black Tawny Purple

Benefits

• Employing multiple modes of action to control the same weed spectrum is part of a good weed resistance management strategy

Roundup Ready 2 Xtend soybeans are tolerant to both dicamba (Group 4) and glyphosate (Group 9), and are intended to provide soybean growers with the option of applying Roundup WeatherMAX® herbicide (glyphosate) and dicamba for maximum weed control • The residual activity of dicamba may reduce early weed competition and improve late-season control, supporting higher yields and cleaner fields at harvest