Entomologists in Texas got a whiff of a new stink bug doing economic damage to soybeans in Texas and are developing ways to help farmers combat it, according to a report in the journal Environmental Entomology.
Various types of stink bugs have long been a problem on soybean crops, but when sweeps of fields in southeast Texas netted 65 percent redbanded stink bugs, entomologists realized this particular bug had become the predominant pest problem, according to Dr. Mo Way, an entomologist at the Texas A&M AgriLife Research and Extension Center in Beaumont.
The problem was no one in the U.S. knew much about the redbanded stink bug and how it had been able to overcome the previously predominant southern green stink bug, green stink bug and brown stink bug, Way said. An insect's life cycle and biology have to be understood before scientists can figure out ways to control it.
Texas farmers plant a little less than 200,000 acres of soybeans a year, according to the U.S. Department of Agriculture's National Agricultural Statistics Service.
"The redbanded stink bug has been a serious pest of soybeans in South America since the 1960s," said Dr. Suhas Vyavhare, a postdoc at the Beaumont center who began his work on the insect as a graduate student there. "It was never a problem in the United States until around 2000. Prior to that, it was known to be in the soybean fields, but that's when it was first reported in Louisiana as being an economic pest."
Not only did the research team find insect numbers at economically damaging levels in Texas but also determined that the redbanded stink bug was becoming resistant to the organophosphate chemical that previously had provided effective control, said Vyavhare, who collaborated with Way and AgriLife Research entomologist Dr. Raul Medina in College Station.
"We started by looking at population dynamics, or how abundant redbanded stink bug is in Texas," Vyavhare said. "We did sweep net surveys across various commercial soybean fields in southeast Texas. We also looked at insect-plant interaction in order to determine what soybean growth stages are most susceptible to redbanded stink bug damage so we could target pest management practices."
He said the researchers also had an inkling the redbanded stink bug was responsible for what is known as delayed maturity syndrome in which the soybean plant does not grow at its normal rate. They tested this theory by subjecting a controlled growth of soybeans to different densities of redbanded stink bugs and found that the insect is directly connected to the disorder.
"There are more than 50 species of stink bugs found in soybeans. Some of them are beneficial and some are pests," Vyavhare said. "The redbanded stink bug as compared to the other pest stink bugs is smaller, and it has the ability to fly faster. So it is very agile, and that contributes to its movement into different areas, and it could be one of the reasons why it is not that susceptible to insecticides because when a farmer sprays the field, they could be escaping before the chemical reaches them."
Finding that the insect is becoming resistant to the common insecticide used as well as the fact that more frequent doses were required to control them was a significant point in the research, Vyavhare said.
"Now we are recommending that farmers use different products rather than the same one over and over," he said. "So that could reduce the amount of insecticide that is applied. Even if we can reduce the need for one insecticide application, that could save millions of dollars in Texas and the other infected states each year."
The team is also hoping to continue research with other control possibilities such as using a trap crop planted near soybeans to attract the insects away or developing redbanded stink bug-resistant soybean varieties.
Way said the team also is revising a soybean pest management guide last published in 1999 so farmers will know steps that can be taken to reduce crop damage from the redbanded stink bug.
Kathleen Phillips | EurekAlert!
Filling intercropping info gap
16.11.2017 | American Society of Agronomy
Climate change, population growth may lead to open ocean aquaculture
05.10.2017 | Oregon State University
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses