- Author: Kathy Keatley Garvey
Host is Extension specialist Ian Grettenberger, who coordinates the department's seminars. Access the Google form link here to attend the seminar.
"Coffee agroforests are great for biodiversity conservation and sustain millions of families and national economies," Jiminez-Soto says in her abstract. "Within these shaded agroecosystems, a complex network of interactions and the availability of resources maintain coffee pests in check, particularly the coffee berry borer, the most devastating insect pest for coffee. Despite the importance of biodiversity conservation and maintenance of shade in these systems, the life of people is often at odds with conservation efforts and management practices, revealing social inequalities and contradictions in plantation-like agricultural systems. In this presentation, I share socio-ecological complexities in the coffee-biodiversity nexus, focusing on ants as biocontrol agents, and the everyday lived experience of farmworkers in Mexican coffee agroforests."
Jiménez-Soto was quoted in a National Geographic piece, "How This Invasive Snail Could Save Your Coffee from Destruction," published on March 10, 2020.
Writer Forest Ray pointed out that "Coffee leaf rust is the most economically significant coffee pest in the world. Since the 1980s, occasional outbreaks of this fungus have crippled coffee production in the Americas, at times doubling or tripling its price. And the problem has escalated since 2008, as have the massive resources invested in fighting it."
Jiménez-Soto, sharing her expertise on both coffee and biocontrol measures, was quoted as saying: "Classic approaches to pest control have often failed to understand this complexity, causing major natural disasters."
She holds a master's degree and doctorate in environmental studies from UC Santa Cruz, receiving her master's degree in 2015 and her doctorate in 2018.
For technical issues involving the seminar, contact Grettenberger at imgrettenberger@ucdavis.edu. A list of the remaining virtual seminars for the winter quarter (with the Zoom links) are here.
- Author: Kathy Keatley Garvey
But thrips do pack a powerful punch.
A major pest of many agricultural crops, including lettuce, they damage plants by (1) sucking their juices and (2) transmitting viruses.
If you've been following the thrips damage in the lettuce production in the Salinas Valley, or want to know more about thrips, the UC Davis Department of Entomology and Nematology's virtual seminar on Wednesday, Jan. 20 should interest you.
Research entomologist Daniel Hasegawa of the Crop Improvement and Protection Research Unit, Agricultural Research Service, U. S. Department of Agriculture, will speak on "Landscape and Molecular Approaches for Managing Thrips and Thrips-Transmitted Viruses in the Salinas Valley" at the department's first seminar of the winter quarter.
The hour-long virtual seminar, via Zoom, begins at 4:10 p.m., announced agricultural Extension specialist Ian Grettenberger, seminar coordinator. To access the seminar, fill out this Google form link at https://bit.ly/3oWYjnt. (Contact Grettenberger at imgrettenberger@ucdavis.edu.)
"In 2019-2020, lettuce production in the Salinas Valley of California was devastated by thrips-transmitted impatiens necrotic spot virus (INSV)," Hasegawa says in his abstract. "Due to the inherent challenges in managing thrips using conventional chemical tactics, and no direct means for managing the virus, there is a strong need for new management strategies."
This seminar, he says, will provide an overview of
- The challenges in managing thrips and INSV in lettuce production
- What we've learned about the epidemiology of thrips and INSV, and
- Opportunities to improve cultural practices and develop biotechnology tools, such as RNAi for managing thrips and INSV in the Salinas Valley.
Hasegawa joined the Salinas USDA-ARS team in May 2019 after serving as a postdoctoral research associate (molecular biology) for three years with the USDA-ARS in Charleston, S. C. He specializes in vector entomology, molecular biology and biotechnlogy. "My lab uses a variety of techniques to understand insect vector-virus relationships that impact plant health and agriculture," he says on Linked In. "We use molecular, genetic, and epidemiological concepts to understand drivers of vector-borne transmission of pathogens and utilize genetic technologies (e.g. RNAi and CRISPR), to improve agriculture productivity and sustainability."
Hasegawa received his bachelor of science degree in biochemistry in 2007 from UC Riverside and his doctorate in biology from Clemson University in 2013.
The mission of the Crop Improvement and Protection Research Unit is to improve germplasm of lettuce, spinach and melon, determine basic biology of viral, fungal and bacterial diseases affecting these crops, develop alternatives to methyl bromide as a soil fumigant for control of soilborne pests in strawberry and vegetables, reduce postharvest losses of lettuce, develop scientifically based organic crop production practices, and develop methods for control of weeds. (See more on the Pacific West Area website.)
"More than 90 percent of the lettuce sold in the United States is grown in California, and the majority of production from April through October occurs in the Salinas Valley, while production form November through March occurs in California's Imperial Valley," according to keepcaliforniafarming.org.
The UC Statewide Integrated Pest Management Program (UC IPM) says this about thrips: "Thrips, order Thysanoptera, are tiny, slender insects with fringed wings. They feed by puncturing the epidermal (outer) layer of host tissue and sucking out the cell contents, which results in stippling, discolored flecking, or silvering of the leaf surface. Thrips feeding is usually accompanied by black varnishlike flecks of frass (excrement). Pest species are plant feeders that discolor and scar leaf, flower, and fruit surfaces, and distort plant parts or vector plant pathogens. Many species of thrips feed on fungal spores and pollen and are often innocuous. However, pollen feeding on plants such as orchids and African violets can leave unsightly pollen deposits and may reduce flower longevity. Certain thrips are beneficial predators that feed on other insects and mites."
"Thrips can readily move long distances floating with the wind or transported on infested plants, and exotic species are periodically introduced," UC IPM notes.
/span>- Author: Kathy Keatley Garvey
Midge madness?
Yes, and Briggs beckons.
"Midge madness" will occur from 12:10 to 1 p.m. Wednesday, Feb. 25 in 122 Briggs Hall on the University of California, Davis, campus.
That's when Claudio Gratton of the Department of Entomology, University of Wisconsin, Madison, will discuss "Midge Madness! Quantifying Linkages Between Lake and Land" during the eighth of 10 winter seminars sponsored by the UC Davis Department of Entomology.
You've probably heard of the billions of midges--small two-winged flies--that swarm periodically at Lake Myvatn, Iceland. An article published last March in Science Daily indicated that at their peak, "it is difficult to breathe without inhaling the bugs, which hatch and emerge from the lake in blizzard-like proportions. After their short adult life, their carcasses blanket the lake, and the dead flies confer so much nutrient on the surrounding landscape that the enhanced productivity can be measured by Earth-observing satellites."
Gratton describes
By the way, Lake Myvatn means "midge lake" in Icelandic.
"We used this lake and the surrounding landscape to examine the effect that large-scale spatial subsidies have on terrestrial arthropod food webs," said Gratton, who received his doctorate in entomology from UC Berkeley in 1997. "Our studies have shown that by moving from lake onto land, the midges act as two types of subsidies."
"First, they can transfer as much as 70 kg N and 10 kg P ha-1 yr-1 to a 100-200m wide area surrounding the lake, resulting in increased plant quality, biomass and increased detritivore and herbivore abundance."
"Second, they subsidize the food base of the natural enemies (mainly spiders) on the terrestrial shoreline. As a result, food web interactions on land are significantly affected by the adjacent lake ecosystem, effects that have the potential to propagate over the long-term, even after midge abundances subside."
Want to learn more about the mighty midges of Myvatn? Attend Gratton's presentation next Wednesday. UC Davis Department of Entomology hosts are Peter Epanchin of the Graduate Group in Ecology (he's in professor Sharon Lawler's lab), and professor and insect ecologist Jay Rosenheim.
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