Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

MSU Researchers Find Rice Seed Treatments Effective, Worth Investment

18.02.2014
When every extra expense makes a difference in profitability, farmers often wonder which management decisions are worth the extra cost.

One recent example is the development of seeds treated with insecticides to discourage early damage by crop pests. Researchers at Mississippi State University have been evaluating the effectiveness of rice seed treatments to find out what producers can expect from the extra investment. Their research saves farmers time and money while helping them make informed decisions about managing their fields.


(Photo by Delta Research and Extension Center/Jeff Gore)

The rice water weevil, such as this adult on a rice leaf, is one of the most troublesome insect pests in rice, but seed treatments have proven to be effective in controlling them. The scars on the leaf are evidence of the rice water weevils’ feeding.

After testing scores of samples taken from rice fields across the state, MSU scientists found that seed treatments are effective in managing the crop’s most troublesome insect pests.

“In Mississippi, we’ve been evaluating seed treatments for about five years,” said Jeff Gore, entomologist with the Mississippi Agricultural and Forestry Experiment Station and MSU Extension Service. “Our research has shown that rice grown with a seed treatment typically yields from 8 to 12 bushels more per acre than untreated rice. The main reason for that yield increase is rice water weevil control.”

Gore said seed treatments are effective in both conventional rice varieties and hybrids.

“Although they do not provide 100 percent control of rice water weevil, seed treatments do provide significant benefits in rice,” he said. “Because control is not absolute, a foliar insecticide application may be necessary to maximize control in some situations.”

Insect management …

Gore works at the Delta Research and Extension Center in Stoneville. He said researchers take core samples about 4 inches in diameter and 8 inches deep from farms across the Delta, wash them and count the rice water weevil larvae.

“An infestation of one larva per core will result in about a 1 percent yield loss,” Gore said. “Typical infestations in the Delta range from 10 to 25 weevils per core in untreated fields, resulting in a 10 to 25 percent yield loss.”

Gore said that seed treatments provide other benefits to rice producers, too.

“Seed treatments provide good control against a whole complex of other rice pests,” he said. “Seed treatments help manage chinch bugs, grape colapsis, thrips and soil insects, such as wire worms and white grubs, and get the plants off to a good, healthy start.”

Performance under flood …

Seed treatments for row crops, such as corn, cotton or soybean, target early-season pests that are in the soil when the seed is planted. But rice seed treatments are different.

“We’re targeting primarily rice water weevils, and they only move into the field when producers establish the permanent flood about three to six weeks after planting,” Gore said. “So seed treatments for rice have to last longer than in other crops, because they are sitting in the field a lot longer.”

Gore said all of the seed treatments are water soluble, and water can have both positive and negative effects on seed treatments.

“Because rice is grown in aquatic or semi-aquatic environments, we needed to find out how different water management practices might impact the seed treatments’ performance,” he said.

Andrew Adams, an MSU graduate student from Greenville, set up tests in grower fields across the Delta and at the Delta Research and Extension Center.

“To determine the impact of a delayed flood, we looked at flood timings of six and eight weeks after planting, which is about two months that the seed treatment was sitting in the soil without having insect pressure,” Adams said. “Where we delayed the permanent flood until eight weeks after planting, the seed treatment was not compromised and no yield losses were observed.”

Flushing fields …

Adams also looked at the impact of flushing fields. Flushing a field is a form of irrigation where the field is brought to a shallow flood and then drained.

“Flushing is used for herbicide incorporation, seed germination or for irrigation during hot and dry conditions,” he said.

Adams tested zero, one and two flushes with water across a rice field to check the efficacy of three different seed treatments.

“We found that zero and one flush had no negative impact,” he said. “The seed treatments Cruiser and NipsIt were negatively impacted with the application of the second flush and yield losses were observed. However, Dermacor wasn’t negatively impacted by the application of the second flush.”

Seed treatment rates …

Gore and Adams also tested the efficacy of seed treatment rates in hybrid rice.

“Hybrid rice varieties are grown at 20 to 25 pounds of seed per acre, versus 75 to 85 pounds with conventional varieties,” Gore said. “Because seed treatment rates are based on a per-seed basis, we wanted to know if the lower seeding rate, and hence the lower seed treatment rate on a per acre basis, impacted insect control. It did not.”

No additional benefit was observed from increasing the seed treatment rate. Currently labeled rates for hybrid rice production are correct, Gore said.

“The management practice that showed significant improvement in rice water weevil control beyond the seed treatment was a foliar overspray with a pyrethroid on hybrid rice,” Gore said.

Dr. Jeff Gore | Newswise
Further information:
http://www.msstate.edu

More articles from Agricultural and Forestry Science:

nachricht Plasma-zapping process could yield trans fat-free soybean oil product
02.12.2016 | Purdue University

nachricht New findings about the deformed wing virus, a major factor in honey bee colony mortality
11.11.2016 | Veterinärmedizinische Universität Wien

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>