- Author: Kathy Keatley Garvey
Her dissertation proposal begins at 10:30 in 122 Briggs Hall and also will be virtual. The Zoom link: https://ucdavis.zoom.us/j/
“In the proposed research, I will study the effectiveness of both automated precision spray applications and drone-mediated releases of biological control agents for the suppression of lettuce aphid and western flower thrips in several contexts," she says in her abstract. "I hope that the results of the proposed research will contribute to the development of best-use practices to guide the use of both technologies."
"I will generate novel data that fill existing knowledge gaps regarding the use of precision insecticide applications and drone releases of natural enemies in lettuce production systems. This will advance the adoption of these new pest management tools and contribute to a more sustainable integrative pest management system for lettuce."
Addie received her bachelor's degree in molecular environmental biology from UC Berkeley in 2011 and her master's degree in horticulture and agronomy from UC Davis in 2018. Before enrolling at UC Davis, she worked as a researcher under research chemist Spencer Walse at the USDA Agricultural Research Service (ARS) laboratory in Parlier, CA (2019-2021) and the UC Davis Contained Research Facility in Davis, CA (2012-2019), studying postharvest integrated pest management (IPM) of quarantine pests.
In her abstract, she noted that "Commercial lettuce production in California's central coast represents 70 percent of the production in the United States. Recent discoveries of some chemistries in ground and surface water in the Salinas valley region have placed the insecticidal chemistries used by the industry at risk of increased regulation. Automated thinner-sprayers use plant-detection sensors to apply chemical sprays directly to individual lettuce plants, so that the same amount of product to plants as a standard broadcast sprayer while potentially reducing the amount of pesticide applied per acre by up to 90 percent. Field experiments testing this technology for the control of western flower thrips (Frankliniella occidentalis) and aphids, lettuce-currant aphid (Nasovonia ribisnigri) and others, were conducted to compare the efficacy of automated sprays to a conventional broadcast application system. Experiments were conducted in conventionally managed organic romaine lettuce fields using a complete randomized block design. Prior to and at regular intervals after treatment, heads were sampled from experimental and control plots to assess pest pressure. Results from this experiment validate the use of the automated sprayers to apply insecticides for the control of aphid and thrips pests in lettuce and will be discussed in the context of developing best-use-practices for this technology."
Abrams delivered a presentation on Rearing methods for brown marmorated stink bug, Halyomorpha halys, on live host plants at the 2019 Pacific Branch of ESA, and has authored or co-authored several publications on stink bugs, including
- Ethyl formate dilution in carbon dioxide for fumigation control of the brown marmorated stink bug Halyomorpha halys, Stål (Hemiptera: Pentatomidae), Pest Management Science, 2022
- Greenhouse rearing methods for brown marmorated stink bug (Hemiptera: Pentatomidae) on live cowpea plants, Journal of Economic Entomology, 2021 (lead author)
-
Sulfuryl fluoride fumigation to control brown marmorated stink bug (Hempitera: Pentatomidae),Postharvest Biology and Technology, 2020 (lead author)
- 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.
