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ARS Home » Midwest Area » Urbana, Illinois » Soybean/maize Germplasm, Pathology, and Genetics Research » Research » Publications at this Location » Publication #99359
Title: ROTATION OF VARIETIES THAT HAVE DIFFERENT RESISTANT PARENTS CAN REDUCE SCN BELOW THE DETECTION LEVEL

Author
item Noel, Gregory
item EDWARDS, DALE - UNIV OF ILLINOIS

Submitted to: National Soybean Cyst Nematode Conference
Publication Type: Proceedings
Publication Acceptance Date: 1/7/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: An 11-year field study examined population development of soybean cyst nematode (SCN), Heterodera glycines, after introduction of 50 cysts/plot into a field that had no history of soybean production. Soybean cultivars either susceptible or resistant to SCN were grown either in monoculture or rotated with corn in 2-year rotations. During the first 5 years, resistant cultivars with the `Peking' source of resistance were planted. By year 5, monoculture of `Peking' resistance resulted in a population increase to 18 cysts/250 cm3 of soil, whereas populations in the continuous cropping of susceptible soybean increased to 45/250 cm3. During years 6-11, SCN-resistant `Fayette' (PI88.788 source of resistance) was planted. In year 6, numbers of cysts declined to 1/250 cm3 of soil when `Fayette' was planted in plots that had been in the monoculture of Peking' resistance. In years 10 and 11 no cysts were found in any plots planted to `Fayette'. Numbers of cysts in plots planted to continuous susceptible soybean remained relatively constant during years 6-11. In spite of low SCN numbers, susceptible soybean in years 1, 3, and 4 yielded more than the resistant varieties that had `Peking' as the source of resistance. In years 6-9 and 11 yield of `Fayette' averaged across rotations was greater than `Williams 82'. This experiment showed that rotation of varieties that have different sources of resistance to SCN (gene deployment) can reduce SCN below detection levels provided that genes for virulence against the rotated source of resistance do not occur in the particular population of SCN.