Connect with us

Science

Fungus attacks, destroys part of Florida strawberry crop

Published

on

ORLANDO, Fla., Jan. 24 (UPI) — A new strain of a deadly fungus has wiped out part of Florida’s strawberry crop this winter, causing perhaps millions of dollars in losses and raising fears of a new permanent pest.

First discovered in the Plant City area east of Tampa — the center of strawberry production in the state — the fungus took hold just as harvest season was beginning in December.

Consumers around the country felt the impact because Florida is the only place in the United States with a major winter crop.

The pestalotiopsis fungus invaded up to one-fourth of Florida’s 10,000 acres of strawberries and about half of its current organic strawberry acreage, said Natalia Peres, a plant pathologist with University of Florida’s agriculture research agency.

While hundreds of acres of plants were lost, other areas suffered partial losses of the fruit or were saved by fungicide spraying.

The actual financial impact is not yet available, but growers of the delicate specialty crop invest at least $15,000 per acre, according to state agriculture statistics.

The average retail price of organic strawberries spiked because of shortages to $6.23 per pound on Jan. 11 from $3.99 per pound during mid-December, according to the U.S. Department of Agriculture.

The fungus causes the fruit, leaves and roots to turn brown with rot, and farmers are worried that the disease might have settled permanently in Florida. They hope it won’t reappear, but the magnitude of infestation makes it more likely it will be a long-lasting problem.

“We lost maybe 80 acres of the organic. It’s definitely a setback, but it’s not a knockout punch for us,” said Gary Wishnatzki, a farmer in the Plant City area. “Conditions have improved, so we’re hopeful.”

At $15,000 per acre, that means Wishnatzki is dealing with a front-end loss of around $1.2 million.

His company, Wish Farms, grows about 600 acres of strawberries, 200 acres of which are organic, and he leases another 1,200 acres to other strawberry operations. According to University of Florida, an acre can yield about 32,000 pounds of organic strawberries, meaning Wishnatzi lost at least 2.5 million pounds of berries.

“We had warm and rainy weather for a few days in late December, and that allowed this new strain of fungus to flourish,” said Peres, a professor of plant pathology. “It arrived in Florida on a young plant brought in from a nursery.”

It hasn’t been determined where the fungus originated, she said. Since young plants generally are imported from California, North Carolina and Canada, Peres is working with researchers in those areas to identify the source.

Peres said she has been seeking a way to control the fungus, especially for organic farmers who have limited choices. She is testing how samples of the fungus react to various substances, including natural botanic-based fungicides that would be allowed in organic production.

Drier weather contained further spread of the fungus as of a few days ago, said Kenneth Parker, executive director of the Florida Strawberry Growers Association.

“It really was a perfect storm for these fungus spores to spread,” he said. “We were spraying and picking and moving through the wet fields for days, and that was spreading the spores.”

Besides finding a fungicide that works, Peres and the growers want to learn what other types of plants and trees might host the fungus.

“We can’t remove all plants from around our fields, but if we know the fungus can survive on oak trees, for example, removing some oaks might prevent having the fungus around another season,” Wishnatzki said.

Florida’s climate allows growing strawberries in winter, but also poses problems in terms of pests, mildew and fungus, Peres said. Because of that, little nursery production of strawberry plants exists locally.

Because of Florida’s problems with pests and fungus, organic strawberry production still is relatively small compared to conventional production. The new fungus proved to have significant resistance to both organic and conventional fungicides, Peres said.

As a small, specialty crop, strawberries often not covered by farm insurance policies. Wishnatzki said that level of risk is why organic produce is more expensive.

“We are working on it as quickly as we can to come up with answers, testing different products,” Peres said. “We’re trying to understand if this strain will survive here.”



Source link

Science

SpaceX launches 60 more Starlink broadband satellites

Published

on

Oct. 18 (UPI) — SpaceX launched its 14th group of 60 satellites from Florida under blue skies Sunday for the company’s Starlink broadband network, which is approaching a full-scale public trial period.

Liftoff occurred on time at 8:25 a.m. EDT aboard a Falcon 9 rocket from Complex 39A at Kennedy Space Center.

The launch boosted the number of satellites in orbit to nearly 800.

After the previous Starlink launch Oct. 6, SpaceX founder and CEO Elon Musk tweeted that the launch would soon allow it to “roll out a fairly wide public” test in the northern United States and “hopefully” in southern Canada.

“Other countries to follow as soon as we receive regulatory approval,” Musk wrote.

The company said emergency responders in northern Washington State had used the Starlink service in wildfire-stricken areas.

“The way emergency responders deployed Starlink in this context is representative of how Starlink works best-in remote or rural areas where internet connectivity is unavailable,” the company reported on its website. “Our Starlink network is still in its early stages, but as our network grows our coverage will grow as well.”

Another initial user of Starlink is the Hoh tribe of Washington, where the service recently allowed it to offer more online education and telehealth services, according to a video produced by the state officials and posted on YouTube on Oct 7.

“It’s like out of nowhere, SpaceX came up and just catapulted us into the 21st century,” Melvinjohn Ashue, vice chairman of the tribe, said in the video.

SpaceX also won the right from the Federal Communication Commission last week to bid for $16 billion in federal funding to provide broadband service to rural areas of the United States.

The company was listed among 186 qualified bidders for the auction, which also includes such big names as Hughes, CenturyLink, Verizon and ViaSat. The money be released annually over a period of 10 years to internet providers so they can offer lower rates in rural areas.

Musk also confirmed on Twitter that Starlink is intended to be usable on fast-moving cars and trains, as long as the dish receivers are mounted and have a clear view of the sky.

Starlink’s ground receivers are designed to have the ability to move and track Starlink signals automatically.



Source link

Continue Reading

Science

Unusual Aussie spider builds one-of-a-kind nest with super strong silk

Published

on

Oct. 19 (UPI) — As far scientists know, no other spider builds a nest quite like the Australian basket-web spider.

Thanks to a new study, published Monday in the journal Scientific Reports, scientists now know how the spider’s lobster pot-like web keeps its structure without the help of vegetation.

“This silk retains its rigidity, allowing a rather exquisite silken basket or deadly ant trap,” study co-author Mark Elgar, a professor of evolutionary biology at the University of Melbourne, said in a news release.

For the study, researchers closely examined the chemical and structural composition of the spider’s silk. Their analysis showed the silk is similar to the kind of silks used by other spiders to construct egg sacs.

“Our discovery may provide insights into the evolution of foraging webs,” said Elgar. “It is widely thought that silk foraging webs, including the magnificent orb-webs, evolved from the habit of producing silk to protect egg cases. Perhaps the basket-web is an extension of the protective egg case and represents a rare contemporary example of an evolutionary ancestral process.”

The lobster pot trap of the basket-web spider, found only in Australia, measures just less than a half-inch in diameter and a bit more than a half-inch in length. It features a series of cross-linked threads of varying diameters.

Researchers were able to analyze the web and its robust fibers using high-resolution imaging technologies at ANSTO’s Australian Synchrotron facilities.

“Nature has created a complex structure that, at first glance, resembles industrially produced composites,” said study co-author Thomas Scheibel, professor of biomaterials at the University of Bayreuth in Germany.

“Further investigations have, however, shown that they are chemically different components and their respective properties together result in the thread’s extreme elasticity and toughness, thus creating a high degree of robustness,” Scheibel said. “With today’s composite materials, on the other hand, it is mainly the fibers embedded in the matrix that establish the particular properties required, such as high stability.”

The research suggests a new genetic material is key to the robustness of the novel silk — a material that could be synthesized at scale for industrial applications.

Scientists estimate, however, that additional research is needed to isolate the material and realize its potential.

“There is increasing recognition that solutions to many of the complex challenges and puzzles we face today can be found from biological systems,” Elgar said.

“This so-called ‘Bioinspiration’ draws on some 3.8 billion years of natural selection honing biological forms, processes and systems. The potential insights from that diversity of life, about which we still know rather little, is staggering,” Elgar said.



Source link

Continue Reading

Science

‘Happy ending effect’ impairs future decision-making, study says

Published

on

Oct. 19 (UPI) — Humans rely on their experiences to inform their decision making process, but new research suggests the “happy ending effect” prevents humans from accurately gauging the true value of an experience.

Previous studies have shown that humans overemphasize the ending of an experience when assessing its value. For example, a spell of bad weather on the last couple days of a vacation can leave travelers with a feeling of disappointment, spoiling their impression of the otherwise enjoyable trip.

New research, published Monday in the Journal of Neuroscience, suggests the phenomenon can interfere with a person’s ability to make good decisions.

“When you’re deciding where to go for dinner, for example, you think about where you’ve had a good meal in the past,” lead study author Martin Vestergaard said in a news release.

“But your memory of whether that meal was good isn’t always reliable — our brain values the final few moments of the experience more highly than the rest of it. If we can’t control our in-built attraction to happy endings, then we can’t trust our choices to serve our best interests,” said Vestergaard, a neuroscientist at the University of Cambridge in Britain.

For the study, researchers had participants select between two streams of coins falling into a bucket in quick succession. Larger coins were higher in value.

One stream was greater in value but ended with a succession of smaller coins, while the other less-valuable stream ended with a run of bigger coins. Participants consistently — and incorrectly — selected the stream that ended with larger coins.

Researchers used brain activity recordings and computational models to better understand the phenomenon. The analysis confirmed that the experience valuation process was encoded in the amygdala.

The study’s authors suggest it’s important for the human brain to observe the upward or downward trajectory of an experience — but the process can also impair a person’s ability to accurately evaluate an overall experience.

“Our attraction to the quality of the final moment of an experience is exploited by politicians seeking re-election; they will always try to appear strong and successful toward the end of their time in office,” said Vestergaard. “If you fall for this trick, and disregard historical incompetence and failure, then you might end up re-electing an unfit politician.

“Sometimes it’s worth taking the time to stop and think,” he said. “Taking a more analytical approach to complement your intuitive judgement can help ensure you’re making a rational decision.”



Source link

Continue Reading

Trending