Soybeans are in the pod filling to early seed stages, R-3 to R-5. Crops reaching R-5 are slightly ahead of previous years and correspond to early varieties, early seeding and/ or higher than normal accumulated heat units, especially in southwestern Manitoba.
Despite localized areas being affected by hail and excess moisture, overall yield potential looks good to excellent for soybeans. The recent heat and moisture has been ideal for pod and seed development. The next few weeks will be critical for maintaining yield potential. Soybeans should not be forgotten as wheat harvest begins.
Monitoring for soybean aphid should continue until R-6 (mid August) on a weekly basis. These insects are only detectable upon close inspection. With good moisture and yield potential also comes disease pressure. Diseases favored by wet soil are beginning to show up, including white mould and Phytophthora root rot. White mould is being observed in fields with dense canopy cover. The first visible symptoms generally occur during pod development after flowers begin to senesce. Once symptoms are visible, it is too late to manage. Soybeans can generally handle a 10 per cent incidence before significantly affecting yield. Bacterial blight remains evident in fields damaged by heavy rains, wind and hail.
Dry beans are advancing well, with pods 2-5 inches long. Earliest fields have some yellow color. Varietal differences in stand-ability following heavy winds and rain are being observed in our direct harvest trial at Carman. Field pea crops are also looking good and desiccation will soon be underway.
To read the full Bean Report for July 30, view this downloadable pdf from the Manitoba Pulse & Soybean Growers.