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!
Unique communication strategy discovered in stem cell pathway controlling plant growth
23.03.2018 | Cold Spring Harbor Laboratory
“How trees coexist” – new findings from biodiversity research published in Nature Communications
22.03.2018 | Technische Universität Dresden
Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
23.03.2018 | Event News
19.03.2018 | Event News
16.03.2018 | Event News
23.03.2018 | Materials Sciences
23.03.2018 | Agricultural and Forestry Science
23.03.2018 | Physics and Astronomy