University of Florida

Citrus Health Management Areas staving off greening with coordinated pesticide spraying

Topic(s): Agriculture, Citrus, Entomology and Nematology, IFAS, Pests, RECs, Research

An Asian citrus psyllid feeds on a citrus tree, leaving the citrus greening bacteria. The bacteria will starve the tree of nutrients and eventually kill it.
GAINESVILLE, Fla. — What’s a little pesticide among neighbors?  For Florida citrus growers, it could mean saving their trees that are under attack from the virulent citrus greening bacterium threatening to destroy the state’s $10.7 billion industry.

Entomologist Michael Rogers, director of the University of Florida’s Citrus Research and Education Center, is telling growers that one of the best approaches to managing citrus greening is to control the insect that spreads this disease. And the best way to do that is by coordinating their pesticide applications with their neighbors. (more …)

Book examines the use of predatory mites for biological control

Topic(s): Agriculture, Biocontrols, Economics, Entomology and Nematology, Environment, IFAS, Invasive Species, Pests, RECs, Research

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GAINESVILLE, Fla. — Biological control of pests, weeds, plants and animals gives “the best hope to providing lasting, environmentally sound and socially acceptable pest management,” according to a new book edited by two UF/IFAS scientists.

The book, “Prospects for Biological Control of Plant Feeding Mites and Other Harmful Organisms,” was recently published by Springer Science. It includes chapters by scientists in California, Kenya, Benin, Brazil, Colombia, Greece, Spain and New Zealand.

Research compiled in the book examines how predatory mites can be used to control other plant-eating mites and other harmful organisms such as stable flies, mushrooms flies and some soil pests, said Daniel Carrillo, a UF/IFAS assistant professor in entomology. The book serves as an important resource for anyone searching for efficient and sustainable biological methods of pest control. Biological control is vital because pests become more difficult to control as they build resistance to pesticides.

“So, biological control is a sound alternative,” Carrillo said. “You can release predatory mites to control spider mites, whiteflies and thrips, among other pests. People use them in greenhouses mostly.”

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It’s a bug-eat-bug world out there for strawberry growers

Topic(s): Agriculture, Biocontrols, Crops, Economics, Entomology and Nematology, Environment, IFAS, Pests, RECs, Research

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GAINESVILLE, Fla. — A new University of Florida scientist is trying to find an insect that will eat the fly that’s damaging such fruit as strawberries and blueberries in the Sunshine State.

Such a finding would be critical in Florida, where the strawberry harvest brought in $267 million in 2013, according to the U.S. Department of Agriculture.

Justin Renkema, an assistant professor in entomology, recently developed tools to help determine whether he’s found a biological control for the Drosophila suzukii, commonly called the spotted wing drosophila.

Among other goals of the experiments, Renkema and his co-authors wanted to detect the DNA of spotted wing drosophila after it’s been eaten by a predatory rove beetle. This is a critical test to know whether one insect has eaten another, he said.

“The molecular tools we developed should be useful for testing whether other predators inhabiting fruit and berry fields consume spotted wing drosophila,” said Renkema, a new faculty member at the UF/IFAS Gulf Coast Research and Education Center in Balm.

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UF/IFAS scientists: Keep up your guard for West Nile virus

Topic(s): Entomology and Nematology, Environment, Families and Consumers, IFAS, Pests, RECs, Research, Weather


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for more information and a video, click here: http://bit.ly/1IrtbSv

GAINESVILLE, Fla. — While Florida has never experienced a serious West Nile virus epidemic, UF/IFAS scientists caution the public to remain vigilant about this dangerous mosquito-borne illness.

Meanwhile, UF/IFAS researchers continue to study ways to nip the virus in the bud and monitor its spread. Researchers at the UF/IFAS Florida Medical Entomology in Vero Beach track rainfall, groundwater levels, mosquito abundance, wild bird populations and virus transmission to animals including horses and sentinel chickens. Researchers use these data to track the virus transmission between mosquitoes and wild birds, noting when mosquito infection rates reach the levels that can infect humans.

West Nile virus, first detected in the U.S. in New York City in 1999, and in Florida in 2001, has been confirmed hundreds of times nationally, and it can be lethal. For example, 779 cases (with 28 deaths) were reported in California in 2004, most from three southern California counties. The next summer, 880 cases (with 19 deaths) were reported in counties across the state.

The environmental conditions that favor West Nile virus transmission in Florida include very dry winter and early spring months, followed by heavy rainfall and short periods of drought – usually 10 to 14 days — in the late spring and early to mid-summer months.

Low winter temperatures also help to predict epidemic risk, especially in south Florida, said Jonathan Day, a professor at the UF/IFAS lab in Vero Beach. Years when exceptionally cold periods were reported in south Florida, such as 1977 and 1989, were followed by mosquito-borne virus epidemics.

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Updated Florida Citrus Rootstock Selection Guide available

Topic(s): Agriculture, Citrus, Crops, Extension, IFAS, Pests, RECs, Research

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GAINESVILLE, Fla. — The 3rd edition of the Florida Citrus Rootstock Selection Guide is now available. The updated guide is a convenient, easy-to-use reference to 20 characteristics of 45 rootstocks. It highlights 21 recently released rootstocks, some of which show reduced citrus greening incidence in early field trials.

Of the 45 rootstocks, 12 are time-honored commercial ones, 12 are minor commercial ones that are less frequently used but may have been prominent once. The third group is the most recently released rootstocks for which there is limited commercial experience, but are increasingly being used in the Florida citrus industry.

The revised guide is important because rootstocks basically provide the root system of a citrus tree and influence many traits of the whole plant. When a Valencia orange or Marsh grapefruit is grafted to the rootstock seedling, such things as tree size, fruit quantity and quality are usually improved by the rootstock.

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Laurel wilt disease likely to increase Florida avocado prices

Topic(s): Agriculture, Crops, Economics, Families and Consumers, IFAS, Pests, RECs, Research

In this photo released by the University of FloridaÕs Institute of Food and Agricultural Sciences, agricultural economist Edward ÒGillyÓ Evans, left, and tropical fruit expert Jonathan Crane examine avocados in a research grove at UFÕs Tropical Research and Education Center in Homestead Ð Thursday, Jan. 15, 2009. The pair helped write a paper on the potential economic impact of laurel wilt, a disease threatening FloridaÕs avocado crop. If the disease reaches Miami-Dade County, it could destroy half the crop and cost the state $27 million. (AP photo/University of Florida/IFAS/Thomas Wright)

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GAINESVILLE, Fla. — Growers in Florida’s $100 million-a-year avocado industry could see a rise in the price of avocados in the short term due to a reduction in domestic production, because of the deadly Laurel Wilt pathogen, a new University of Florida study shows.

But any noticeable price increase probably wouldn’t last because increased imports from the Dominican Republic are likely to temper any price increases.

Edward Evans, a UF/IFAS associate professor in food and resource economics, is quick to note, however, that he conducted his study before the recent discovery of a medfly outbreak in the Dominican Republic. The outbreak led the U.S. Department of Agriculture to restrict imports of green-skin avocados from that country. This avocado is similar to the type produced in the Sunshine State.

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Citrus greening research gets $1 million in state budget funding

Topic(s): Agriculture, Announcements, Citrus, IFAS, New Technology, Pests, RECs
Citrus groves at the Citrus Research and Education Center in Lake Alfred, Florida. Oranges, fruit, trees.   UF/IFAS Photo by Tyler Jones.

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GAINESVILLE, Fla. — A $1 million University of Florida research project to fight citrus greening got the green light in the state’s budget.

Nian Wang, a researcher with UF’s Institute of Food and Agricultural Sciences, is working with a team to develop a microbial-based product, infused with patented plant-defense inducers and beneficial bacteria strains, that he hopes will cure citrus greening. (more …)

UF/IFAS scientists adapt household products to dupe and trap deadly disease-carrying insects in Africa

Topic(s): Entomology and Nematology, Environment, IFAS, New Technology, Pests, Research

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GAINESVILLE, Fla. – Crushed seashells and vinegar could be the key ingredients in an inexpensive and readily available way to lure and trap disease-carrying insects in developing nations, according to a new UF/IFAS study.

By using these simple ingredients, insect experts can find easier ways to trap and monitor disease-carrying insects, said Nathan Burkett-Cadena, a UF/IFAS assistant professor of entomology, who led the recent study.

Mosquitoes transmit malaria, West Nile virus and chikungunya virus.  Monitoring these insects is critical to understanding when and where to control them and lessen the risk of human disease. Insect experts the world over use carbon dioxide, the same gas that humans exhale, to attract blood-feeding bugs to traps, so they can measure their abundance, test them for diseases and make decisions about whether or not to control them.

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UF/IFAS Fort Pierce quarantine facility successfully battles invasive species

Topic(s): Agriculture, Biocontrols, Conservation, Crops, Economics, IFAS, Invasive Species, Pests, RECs, Research

Bill Overholt and Jim Cuda.  Innovation Awards Portrait.  UF/IFAS File Photo.

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GAINESVILLE, Fla. — University of Florida officials expressed thanks Monday for the $180,000 increase in the state budget that’s slated for the quarantine research facility at the UF/IFAS Indian River Research and Education Center in Fort Pierce.

With the additional funding, scientists will be able to expand foreign exploration to identify new candidate biological control agents of Florida’s worst invasive plants and insects, and support intensified laboratory studies that are required to ensure agents are safe for release, said Bill Overholt, a UF/IFAS entomology professor who works at the quarantine facility.

With biological control such as one bug eating another, scientists and growers can use a sustainable, cost-effective solution to manage invasive plant and insect problems.

“The facility needs an increase in the amount of operating funds in order to reach its full potential,” said Mary Ann Gosa-Hooks, director of UF/IFAS Government Affairs. “We can do so much more, but with costs continuing to increase, while the facility continues to function on the same budget since 2004, activities are somewhat limited.”

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Barn owls threatened by Africanized bees in South Florida

Topic(s): Agriculture, Biocontrols, Entomology and Nematology, Environment, IFAS, Invasive Species, Pests, RECs
Richard Raid and a barn owl in Belle Glade. Keywords: sugar cane, bio pest control, South Florida, agriculture, bird, wildlife. Photo by Eric Zamora UF/IFAS

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Belle Glade, Fla. — Throughout the past two decades, University of Florida researcher Richard Raid has seen barn owl populations in the Everglades Agricultural Area, centered around Belle Glade, expand from mere dozens to more than 400 nesting pairs.

But these beneficial raptors, currently listed as a threatened species, are now being threatened by Africanized honey bees.  Swarming as frequently as eight times per year, the invasive bees have been taking over nesting boxes Raid and students have built for the owls, using them as hives, and displacing or even killing the desired raptors. (more …)

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