Subtropical Fruit Crops Research & Education
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Subtropical Fruit Crops Research & Education

Posts Tagged: drone

Avocado Disease on High

UAV-based Remote Sensing Can Help

      Avocado Growers by

                Detecting Asymptomatic Pathogen

And maybe a lot of other problems like Shot Hole Borer-Fusarium Dieback in Avocado and other California tree species and maybe Huanglongbing in citrus.

GAINESVILLE, Fla. — Remote imaging can effectively detect a pathogen that endangers the $100 million-a-year Florida avocado industry – even before the trees show symptoms — University of Florida scientists say.

Yiannis Ampatzidis, an assistant professor of agricultural and biological engineering at the UF Institute of Food and Agricultural Sciences, led recently published research that shows that multispectral cameras can detect laurel wilt on avocado trees. The approach costs less than manually trying to detect the laurel wilt pathogen, Ampatzidis said, though UF/IFAS researchers don't know yet the cost differential.

Avocados provide an estimated $100 million-a-year economic benefit to the state's economy, according to UF/IFAS research. California grows most of the nation's avocados, but Florida is the second-leading producer. About 95 percent of Florida' avocados are grown in South Florida, particularly in Miami-Dade County. So UF/IFAS researchers first infected avocado trees with laurel wilt at the UF/IFAS Tropical Research and Education Center in Homestead, Florida.

Then they brought those trees to the UF/IFAS Citrus Research and Education Center in Lake Alfred, Florida, where Jaafar Abdulridha, a postdoctoral researcher for Ampatzidis, tested if the remote-sensing techniques would discern the laurel wilt pathogen. At the Citrus REC, UF/IFAS researchers identified wavelengths that they can use to detect laurel wilt early in avocados.

Multispectral cameras can capture data within specific wavelengths across the electromagnetic spectrum, said Ampatzidis, who specializes in precision agriculture. Humans can only see very small areas of the spectrum.

“In general, growers need to scout their field and visually detect infected plants,” said Ampatzidis, a faculty member at the UF/IFAS Southwest Florida Research and Education Center in Immokalee, Florida. “It is very time-consuming, labor-intensive and costly. And of course, they can only detect diseases based on their symptoms.”

“Using different filters, we can separate wavelengths,” he said. “So, these multispectral cameras are sensitive to particular wavelengths.”

The proposed system could detect diseases in asymptomatic stages, thus telling growers earlier that their trees are infected, he said. An unmanned aerial vehicle – or drone — with a multispectral camera can cost between $3,000 and $8,000, Ampatzidis said.

The new study is published in the journal Computers and Electronics in Agriculture.


By: Brad Buck, 352-294-3303,

The mission of the University of Florida Institute of Food and Agricultural Sciences is to develop knowledge relevant to agricultural, human and natural resources and to make that knowledge available to sustain and enhance the quality of human life. With more than a dozen research facilities, 67 county Extension offices, and award-winning students and faculty in the UF College of Agricultural and Life Sciences, UF/IFAS works to bring science-based solutions to the state's agricultural and natural resources industries, and all Florida residents. Visit the UF/IFAS web site at and follow us on social media at @UF_IFAS.

avocado body rot1
avocado body rot1

avocado body rot1
avocado body rot1

Posted on Friday, February 22, 2019 at 6:16 AM
Tags: avocado (275), drone (2), spectral analysis (1)

Water and Nutrient Management in Avocado and Citrus

Recent talks by UC's new irrigation engineers can help shed light on irrigation improvements that also apply to plant health and better orchard management. The Pourreza talk has implications for identifying HLB infected citrus trees, as well as trees in general stress. The Spann presentation shows how avocado growers will be able to adjust fertilizer applications to their orchards.  These talks are posted on the California Avocado Society website.


Below are links to our April Seminar presentations
Click on the presentation title and please make sure to either download or save to your computer
"Old and New Smart Agriculture"
Khaled Bali
Irrigation Specialist, Kearney REC
Alireza Pourreza
Assistant Agricultural Mechanization Engineer, UC Davis
Tim Spann, PHD
CAC Research Program Director, 

avocado irrigation
avocado irrigation

Posted on Friday, May 18, 2018 at 7:20 AM
Tags: avocado (275), drone (2), irrigation (77), nutrients (21), scheduling (11)
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