Slow Sudden Death
Slow sudden death syndrome (SDS) this fall and winter as you weigh management decisions for the 2011 soybean crop.
University of Illinois plant pathologist Carl Bradley urges growers to keep track of fields that struggle with the disease. Variety selection is your first line of defense. "Although no soybean varieties have complete resistance to SDS, differences in susceptibility exist," Bradley says.
SDS is also associated with early planting. Bradley recommends planting fields with no history of SDS problems first and finishing with those where you’ve noted SDS in the past. Fields planted in late April seem to be the most impacted.
Management practices that improve soil drainage and avoid compaction may help limit losses. Interactions between SDS and soybean cyst nematode have also been noted. If both are present in the field, yield losses are typically more dramatic.
The fungus Fusarium virguliforme infects soybean roots early in the growing season. Plants may have a blue-green discoloration on the surface of the root. The most common SDS symptoms
appear late in the growing season. There is no effective treatment by the time symptoms appear.
Bayer CropScience and Monsanto Company are teaming up against corn nematodes. The companies announced they have entered into an exclusive agreement on the use of Poncho/VOTiVO for corn, which contains the 500 rate of Poncho and the new biological seed treatment called VOTiVO. The new product, Poncho/VOTiVO, will be part of Monsanto’s Acceleron Seed Treatment Products for corn.
VOTiVO, which contains bacteria that live and grow with young corn roots, provides a living-barrier approach to protecting seedlings and roots against nematodes. Poncho delivers control of wireworm, black cutworm, white grub and other early-season pests. Four years of Bayer CropScience field research show the combination delivers an average 6 bu. to 8 bu. per acre yield increase over the 250 rate of Poncho.
Kerry Grossweiler, Bayer CropScience marketing product manager, says, "Growers are beginning to understand how much yield they are sacrificing to corn nematodes," he says. "This novel control mechanism surrounds the roots with a protective barrier that lasts through the critical period of seed germination and plant establishment."
Added Ear Protection
"Take that earworm home with you," joked Syngenta field agronomist Barry Soliday. There were plenty of specimens available because the demonstration field near Pekin, Ill., was seeded with the pest. It was a chance to compare the Agrisure Viptera 3111 trait stack to hybrids without similar protective traits.
Growers will get a taste of the new technology in 2011. Vip3A, the first vegetative insecticidal protein in the industry, will be the platform for Syngenta insect control. It is derived from Bacillus thuringiensis but differs from crystalline proteins by binding to receptors in the midgut membrane. Agrisure 3000GT (a Cry protein) will be stacked with the Agrisure Viptera trait for control of 14 above- and belowground insects.
"It takes less feeding than you think to add up to real numbers," Soliday notes. "The loss of 14 kernels per ear equates to a 4.5 bu. yield loss and opens the ear up to a host of mold and other damage issues."
For the coming season, Syngenta plans to have about 15 hybrids and 20% of the hybrid lineup in the Agrisure Viptera trait stack.
- October 2010