ET, a broadleaf herbicide from Nichino America Inc., is now registered for post-emergence use in corn and soybeans, the company announced.
"ET is especially strong on pigweed, morningglory, chickweed, henbit, lambsquarters, and cutleaf evening primrose, and each of those is a huge problem in the South and are often found in combination," said Chad Dyer, herbicide product manager for Nichino America. "With ET in the tank, corn and soybean growers can control their toughest broadleaf problems."
Eric Prostko, extension weed specialist with the University of Georgia, said that ET will be useful where morningglory is present. "Morningglory is one of our most troublesome weed problems," Prostko said. "ET will be useful there.
Prostko said the No. 1 weed problem in Georgia - and in much of the south - is Palmer Amaranth, a species of pigweed. The primary control for that is glyphosate and ET increases glyphosate's effectiveness against Palmer Amaranth, especially if the weed is small, said Mike Marshall, extension weed specialist with the University of South Carolina.
In Virginia, lambsquarter and morningglory are major challenges.
"If ET can control those two and mix with Roundup - because most of our beans are Roundup Ready - it'll definitely 'play in Peoria' in this part of the country," said Scott Hagood, professor of weed science at Virginia Tech. "We definitely need help with those two."
Hagood said Roundup isn't as strong on lambsquarter and morningglory as it is on other weeds, so the increase in Roundup Ready crops means that "those are the top two that Roundup is selecting for. We're seeing a weed shift toward those two."
That points up an advantage of tank-mixing, Dyer said.
Many of the older chemistries are not as effective as they used to be, and many of the newer chemistries are not as broad-spectrum. By combining ET with the older chemistries, growers are getting strong performance on some of the toughest broadleaves while bringing back the effectiveness of the older chemistries, Dyer said.
For the best control, Nichino recommends that ET be tank-mixed with glyphosate, 2,4-D or atrazine in corn. That will increase the spectrum of weed control, and it takes advantage of one of ET's strengths - its ability to enhance the efficacy of other herbicides.
"With ET in the tank, the performance of its tank-mix partners is enhanced," Dyer said. "Time and time again, we see that not only does ET control tough broadleaves on its own, it helps its tank-mix partners do their job better."
ET's new label gives growers a second chance to attack some of their toughest weeds, Marshall said.
"ET is a good fit on those harder-to-control winter annuals that Roundup doesn't get, like cutleaf evening primrose, henbit, and chickweed," Marshall said. "We've already been recommending that it be added to glyphosate at burndown. With the new label, growers can also control those broadleaves at post-emergence."
Or at planting and pre-emergence, Dyer said.
ET has long been registered for pre-plant burndown. It is now registered for use at planting, post-emergence, and up to when the second leaf collar is visible on a corn plant or the second triplicate in soybeans.
"Some growers in the South like to apply paraquat at planting or before emergence for burndown," Dyer said. "Paraquat burns weeds back fast, but doesn't have any residual effect. By adding ET at that time, growers can delay regrowth of weeds. We really see this as an opportunity for ET."
The use rate will be three-quarters of an ounce per acre. No adjuvants are needed.
ET's mode of action is different from that of most other corn and soybean herbicides, which is important in avoiding weed resistance and in controlling weeds that might have developed resistance or tolerance to those herbicides, Dyer said. "And the product will be priced at less than $3 an acre," Dyer said. "We expect it to be very popular with growers, even in its first year."
Nichino America is a wholly-owned subsidiary of Nihon Nohyaku Ltd., Japan's oldest agricultural chemical company and manufacturer of agricultural, pharmaceutical and fine chemicals.