Aphid-resistant soybean varieties for Minnesota

Soybean aphid is an invasive pest of soybean that continues to cause economic damage in Minnesota.

underside of green leaves one with light greenish yellow aphids and white aphids and one without
Figure 1: Resistance genes can effectively suppress soybean aphid: Aphid-susceptible (left) and -resistant (right) soybean lines.

To prevent economic loss, producers commonly apply foliar insecticides when aphid densities reach 250 aphids per plant.

For Minnesota soybean producers, yield loss and control costs can be significant.

Aphid-resistant genes (Rag genes)

Using aphid-resistant soybean varieties holds promise as a more sustainable approach to soybean aphid management.

Soybean varieties that possess resistance genes, called Rag genes (Rag1, Rag2, etc.), affect colonization and population growth of soybean aphid (Figure 1).

Soybean varieties with Rag1 or Rag2 genes have significantly suppressed aphid numbers and protected yields in multiple states over multiple years. Varieties with multiple (i.e., pyramided) Rag genes can provide further protection.

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Availability of aphid-resistant soybean

Commercial varieties containing Rag genes have been available since 2009, but are uncommon among early-maturity soybean varieties developed for Minnesota.

We searched seed catalogs and identified several soybean varieties with aphid-resistance (Rag) genes in early-maturity groups and with other traits potentially suitable for Minnesota soybean growers. Table 1 lists these varieties.

Brand names Company Relative maturity Resistance gene(s) Herbicide resistance trait PRR1 SCN1 IDC1 SDS1 BSR1 Organic seed
0543 Gold Country Seed 0.5 Rag1 RR 2Y2 Susceptible Resistant No
1114 Gold Country Seed 1.1 Rag1 RR 2Y2 Resistant Resistant No
LS 10R551N Legend Seeds 1.0 Rag1 RR 2Y2 Resistant Resistant No
NS1040NR2 NorthStar Genetics 1.1 Rag1 RR 2Y2 Resistant Resistant No
3511 R2YN Thunder Seed 1.1 Rag1 RR 2Y2 Resistant Resistant Tolerant No
Viking 0.1544AT Viking Seeds 1.5 Rag1 None Susceptible Tolerant Yes
Viking 0.1955AT Viking Seeds 1.9 Rag1 None Tolerant Susceptible Yes
Viking 2188NAT Viking Seeds 2.1 Rag1 and Rag2 None Resistant No
Viking 0.2188AT12N Viking Seeds 2.1 Rag1 and Rag2 None Resistant Yes
Viking 0.1IA2104RA12 Viking Seeds 2.3 Rag1 and Rag2 None Resistant Yes
Viking 0.2399AT12N Viking Seeds 2.4 Rag1 and Rag2 None Resistant Yes

1PRR: Phytopthora root rot; SCN: Soybean cyst nematode; IDC: Iron deficiency chlorosis; SDS: Sudden death syndrome; BSR: Brown stem rot

2RR 2Y: Genuity Roundup Ready 2 Yield


 

Continue to scout for aphids

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Anthony Hanson, graduate student, College of Food, Agricultural and Natural Resource Sciences; Siddhi J. Bhusal, scientist, College of Food, Agricultural and Natural Resource Sciences; Aaron Lorenz, plant breeder, College of Food, Agricultural and Natural Resource Sciences and Robert Koch, Extension entomologist

Reviewed in 2018

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