Eden Bioscience Corporation has announced that new research shows N-Hibit Seed Treatment reduces soybean cyst nematode (SCN) eggs and cysts while improving plant growth and development. SCN is a microscopic worm estimated to cost U.S. soybean growers about $1.5 billion in yield losses each year.

“In initial evaluations of N-Hibit seed treatments, SCN eggs per root weight were reduced,” said Ned French, Eden Bioscience director of field biology and development. “For example, numbers of eggs and cysts were reduced by more than half in research at Southern Illinois University. But the rates of N-Hibit used were not as economically attractive for growers in these initial studies as in the most recent trials with lower rates.”

The subsequent replicated research by independent agricultural scientists in Illinois and Georgia investigated lower use rates with N-Hibit CST (Commercial Seed Treatment) and N-Hibit HB (Hopper Box) formulations.

“These cooperators demonstrated that N-Hibit at 0.3 ounce per hundredweight of seed reduced soybean cysts per root weight by an average of approximately 40 percent,” said French. “N-Hibit treated soybean plants had improved growth and development in their average number of nodes, leaves, root length and volume, and in plant weight (roots, shoots, and leaves) compared with the untreated control.

“These favorable differences in plant growth may be a consequence of lessened nematode presence and damage. On average, root volume and root length increased more than 30 percent. Plant height, nodes per plant, and leaf count each increased by 14 percent to 21 percent. And total dry plant weight rose 22 percent,” said French. “Such growth effects can have a positive impact on nutrient uptake and distribution, plant health, ability to withstand stress, and ultimately yield.

“The soybean cyst nematode reductions are consistent with what we have seen in cotton for several years, where N-Hibit reduced the juveniles and eggs of root-knot nematodes and reniform nematodes by about 50 percent, while enhancing plant growth,” French noted.

“N-Hibit is an important and very economical new tool for growers to use in the management of SCN,” said Mike Cloutier, Eden Bioscience director of sales and marketing. “The harpin protein in N-Hibit activates the plant's own self-defense and growth systems to defend itself from within against nematodes in the surrounding soil. This is a unique mode of action, and one that involves virtually no environmental or health issues, and because of its high degree of safety, N-Hibit can be applied on-farm at planting as well as applied by commercial seed treaters.

“We recommend applying N-Hibit to the seed either at the dealer or in the hopper box at 0.3 ounce per 100 pounds of soybean seed.”

N-Hibit is a dry powder that is not a restricted use product.