Update:
Objective 1. We have received 300 samples during 2019 to date. With another 16 in February. These are still pending so the numbers below have not changed.
The samples from objective 1 that have egg counts higher than 500 eggs/100 cc of soil will be moved into the greenhouse screen to determine the SCN type. Populations of SCN will first be increased on Williams 82. Test lines [PI548402 (Peking), PI88788, and PI437654] and positive controls (Lee74, Williams 82) will be inoculated with 2500 eggs/second stage juveniles to determine relative virulence.
Table 2. Completed SCN Type Tests – March 2020– Summary of completed populations
41 populations completed to date. Of these Peking was resistant to 20 populations while PI 88788 still had high levels of resistant (<10% of susceptible control) to only 5 populations. Additionally, 24 of the populations could reproduce on PI 88788 at levels of 30 to 60% of the susceptible. These levels can cause measurable declines in yield based on studies in Iowa.
Objective 3.
Several different SCN management studies are in progress.
1. A study that is evaluating if Rye has any influence on SCN populations was planted again for the third year with a cover crop.
a. Spring soil sampling and processing was completed.
b. Data analysis is in progress
c. Note – this field was passed to Laura Lindsey
2. Field experiments at 2 locations with high SCN populations were established, data for SCN populations at planting, at harvest, stand counts and ratings for Sudden death syndrome was collected. Harvest at both sites was completed and data was sent to companies. Final counts of SCN populations are still in progress. Planning is in progress for SCN studies at Western for the 2020 season.
View uploaded report 