Project Details:

Title:
Management of Soybean Cyst Nematode through rotation of Soybean Cyst Nematode resistant varieties and other management practices

Parent Project: Management of soybean cyst nematode through rotation of soybean cyst nematode resistant varieties, and other management practices
Checkoff Organization:Michigan Soybean Promotion Committee
Categories:Nematodes
Organization Project Code:1903
Project Year:2019
Lead Principal Investigator:Marisol Quintanilla (Michigan State University)
Co-Principal Investigators:
Keywords:

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Information and Results

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Project Summary

Soybean Cyst Nematode (SCN) is an important limiting factor of soybean yield in Michigan. SCN resistant varieties have had an important impact in reducing yield losses, however most of the acreage planted with resistant varieties is from just one source of resistance (PI88788) and SCN are beginning to successfully overcome this resistance and reproduce. Interestingly, Fred Warner’s (MSU Diagnostics) data indicates that when SCN soil samples are taken from fields where only the most common (PI88788) source of resistance has been planted, a percentage of them are also able to reproduce on Peking even though the nematodes have never been exposed to this variety, this has been reported by other nematologists.

The first year of this trial (2017) has been completed. There was no significant difference in soybean yield between PI88788 and Peking sources of resistance with and without ILeVO. Overall, low numbers of SCN were found. This could be due to the planting of Peking last season with rotations in the source of resistance and rotating with non-hosts (excellent SCN management by the grower). For nematode results, there was not significant difference in the number of Hoplolaimus and Heterodera (SCN) between variety or ILeVO seed treatment, however, there was a significantly (p = 0.045) higher number of root lesion nematodes in the Peking variety compared to the PI88788. Additionally, there was a significantly higher number of SCN (Heterodera) in the variety with Peking source of resistance (ANOVA p = 0.05, and Tukey mean separation). This could be explained because Greg planted Peking source of resistance in 2016, so perhaps we are seeing a change in Type. We wanted to investigate this further and evaluate the effect of rotating the PI88788 source of resistance with Peking and compare using no rotation (i.e. planting PI88788 for three years on the same plots).

Additionally, rotation with SCN susceptible varieties in the same plots for three years will be compared. Trials will be conducted under greenhouse and field conditions. For the greenhouse trials, one-gallon pots will be inoculated with SCN that have only been in fields with a planting history of PI88788. The inoculated pots will be planted with:
1) PI88788 planted back to back four consecutive times,
2) Peking varieties planted back to back four consecutive times,
3) susceptible varieties planted four consecutive times,
4) Peking-PI88788-Peking-PI88788 rotation,
5) Peking-Suceptible-PI88788-Peking,
6) PI437654-PI88788-Peking, PI437654,
7) non-nematode inoculated soil with PI88788 grown four consecutive times (control).
Randomized block design will be used with seven treatments and six replications each.

Project Objectives

Nationwide Soybean Cyst Nematode resistance management coalition:
In collaboration with Michigan Soybean Promotion Committee, Farm Bureau, Michigan Agribusiness Association, MSU Diagnostic Services, Michigan State University Extension, and finally the nationwide SCN Coalition, this initiative is moving forward successfully. Many products such as a video, in-service trainings, workshops, and outreach materials will be produced with drafts already in progress.

Information regarding ILeVO in other trials in our lab:
We have several trials that include the active ingredient Fluopyram. We have had excellent results in daylilies and positive results in other crops. It seems to be dosage dependent, so when plants are dipped and then planted (daylilies are planted from transplants), the product increases the growth significantly. In furrow treatments can also result in increases in yield. We think that the amount in the seed treatment might be a reason for less effectiveness. In trials of other nematologist, seed treatments do not often result in large differences in yield or nematode numbers, but ILeVO is one of the few that has resulted in benefits in some trials.

Extension:
We have presented information regarding SCN management in SMaRT grower meetings, in field days, webinars, in-service trainings with extension agents, meetings with agribusiness consultants (MABA) and additionally produced videos, extension publications, and news articles. This will continue and expand.

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Benefit to Soybean Farmers

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