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Posts Tagged: pests

Bohart Museum Virtual Open House: Think Pests of Alfalfa and Rice

Cooperative Extension specialist Ian Grettenberger at work in his lab at UC Davis. (Photo by Kathy Keatley Garvey)

Mark your calendar. The Bohart Museum of Entomology at the University of California, Davis, is hosting a virtual open house dealing with...

Cooperative Extension specialist Ian Grettenberger at work in his lab at UC Davis. (Photo by Kathy Keatley Garvey)
Cooperative Extension specialist Ian Grettenberger at work in his lab at UC Davis. (Photo by Kathy Keatley Garvey)

Cooperative Extension specialist Ian Grettenberger at work in his lab at UC Davis. (Photo by Kathy Keatley Garvey)

Graduate student Madi Hendrick sweeping an alfalfa field for pests.
Graduate student Madi Hendrick sweeping an alfalfa field for pests.

Graduate student Madi Hendrick sweeping an alfalfa field for pests.

In its adult form, the alfalfa butterfly is attractive. In its larval form, it's a pest of alfalfa. (Photo by Kathy Keatley Garvey)
In its adult form, the alfalfa butterfly is attractive. In its larval form, it's a pest of alfalfa. (Photo by Kathy Keatley Garvey)

In its adult form, the alfalfa butterfly is attractive. In its larval form, it's a pest of alfalfa. (Photo by Kathy Keatley Garvey)

Posted on Thursday, October 15, 2020 at 4:57 PM
Focus Area Tags: Agriculture, Economic Development, Environment, Food, Natural Resources, Pest Management

A Monarch Paradise in July

A monarch caterpillar molting. (Photo by Kathy Keatley Garvey)

Monarchs, bless their little hearts, souls and wings, deposited 16 eggs on our milkweed plants in July.  Being quite obliging and considerate,...

A monarch caterpillar molting. (Photo by Kathy Keatley Garvey)
A monarch caterpillar molting. (Photo by Kathy Keatley Garvey)

A monarch caterpillar molting. (Photo by Kathy Keatley Garvey)

A monarch caterpillar j'ing; soon it will be a chrysalis. (Photo by Kathy Keatley Garvey)
A monarch caterpillar j'ing; soon it will be a chrysalis. (Photo by Kathy Keatley Garvey)

A monarch caterpillar j'ing; soon it will be a chrysalis. (Photo by Kathy Keatley Garvey)

From left, a chrysalis about to release a monarch; an empty chrysalis or empty pupal exoskeleton, exuvia; a chrysalis; and an newly eclosed adult monarch. (Photo by Kathy Keatley Garvey)
From left, a chrysalis about to release a monarch; an empty chrysalis or empty pupal exoskeleton, exuvia; a chrysalis; and an newly eclosed adult monarch. (Photo by Kathy Keatley Garvey)

From left, a chrysalis about to release a monarch; an empty chrysalis or empty pupal exoskeleton, exuvia; a chrysalis; and an newly eclosed adult monarch. (Photo by Kathy Keatley Garvey)

A newly eclosed female monarch on a Mexican sunflower, Tithonia. (Photo by Kathy Keatley Garvey)
A newly eclosed female monarch on a Mexican sunflower, Tithonia. (Photo by Kathy Keatley Garvey)

A newly eclosed female monarch on a Mexican sunflower, Tithonia. (Photo by Kathy Keatley Garvey)

A female monarch nectaring on a tropical milkweed. This milkweed yielded five caterpillars. (Photo by Kathy Keatley Garvey)
A female monarch nectaring on a tropical milkweed. This milkweed yielded five caterpillars. (Photo by Kathy Keatley Garvey)

A female monarch nectaring on a tropical milkweed. This milkweed yielded five caterpillars. (Photo by Kathy Keatley Garvey)

Posted on Wednesday, August 5, 2020 at 3:04 PM
Focus Area Tags: Environment, Food, Natural Resources, Pest Management, Yard & Garden

Ian Grettenberger Targets a Variety of Pests

Agricultural entomologist and Cooperative Extension specialist Ian Grettenberger joined the faculty of the UC Davis Department of Entomology and Entomology in January 2019. (Photo by Kathy Keatley Garvey)

(Editor's Note: In the midst of the coronavirus pandemic precautions--when facilities are closing down--we're taking time to spotlight some of our UC...

Agricultural entomologist and Cooperative Extension specialist Ian Grettenberger joined the faculty of the UC Davis Department of Entomology and Entomology in January 2019. (Photo by Kathy Keatley Garvey)
Agricultural entomologist and Cooperative Extension specialist Ian Grettenberger joined the faculty of the UC Davis Department of Entomology and Entomology in January 2019. (Photo by Kathy Keatley Garvey)

Agricultural entomologist and Cooperative Extension specialist Ian Grettenberger joined the faculty of the UC Davis Department of Entomology and Entomology in January 2019. (Photo by Kathy Keatley Garvey)

Agricultural entomologist and Cooperative Extension specialist Ian Grettenberger in his office in Briggs Hall, UC Davis. (Photo by Kathy Keatley Garvey)
Agricultural entomologist and Cooperative Extension specialist Ian Grettenberger in his office in Briggs Hall, UC Davis. (Photo by Kathy Keatley Garvey)

Agricultural entomologist and Cooperative Extension specialist Ian Grettenberger in his office in Briggs Hall, UC Davis. (Photo by Kathy Keatley Garvey)

Posted on Wednesday, March 18, 2020 at 4:42 PM
Focus Area Tags: Agriculture, Economic Development, Food, Health, Innovation, Natural Resources, Pest Management, Yard & Garden

California trees are suffering under climate change and invasive pests

Branch die-back in a Chinese flame tree because of invasive shothole borer infestation. (Photo: Beatriz Nobua-Behrmann)
Trees are facing stress from a variety of pressures in California, including climate change and exotic invasive pests, reported Jeanette Marantos in the Los Angeles Times

“There are lots of invasive pests everywhere because of global warming and the movement of plant materials in general,” said Philippe Rolshausen, UC Cooperative Extension subtropical tree specialist at UC Riverside.

Yellowing leaves, a thinning canopy and branch die-back are symptoms that the tree is sick. UC Master Gardeners, headquartered in UCCE county offices across the state, can provide free help, the article said.

Marantos listed possible reasons for common tree symptoms:

Yellow leaves: May be due to a lack of nutrients. A sudden jolt of fertilizer isn't the best solution. Homeowners often remove the best fertilizer and mulch for trees — their own fallen leaves.

Thinning canopies and branch die-back: May be the result of a soil-born disease, such a phytophthora, caused by excessive water. “Homeowners have a tendency to over-irrigate a tree that's not doing well, but soil-borne diseases actually thrive in wet soils, so that's making things even worse,” Rolshausen said. “Trees don't like standing water on their root systems because they can't breathe.”

Huanglongbing of citrus: Invested trees send up shoots of bright yellow leaves. Eventually, new leaves get twisted and mottled and the fruit stops ripening. The disease was first spotted in Southern California in the late 1990s and has since been detected in Los Angeles, Orange, San Bernardino and Riverside counties, according to a map prepared by University of California Agriculture and Natural Resources.

The Times article also recommended the UC Integrated Pest Management Program website to learn how to diagnose and control tree insects and diseases.

Posted on Monday, March 2, 2020 at 8:59 AM
Focus Area Tags: Yard & Garden

A Good Day on the UC Davis Campus

Culex quinquefasciatus, the Southern house mosquito, one of the insects that Walter Leal studies. (Photo by Kathy Keatley Garvey)

Today was a good day on the University of California, Davis, campus. The National Academy of Inventors announced that two of our faculty members are...

Culex quinquefasciatus, the Southern house mosquito, one of the insects that Walter Leal studies. (Photo by Kathy Keatley Garvey)
Culex quinquefasciatus, the Southern house mosquito, one of the insects that Walter Leal studies. (Photo by Kathy Keatley Garvey)

Culex quinquefasciatus, the Southern house mosquito, one of the insects that Walter Leal studies. (Photo by Kathy Keatley Garvey)

Posted on Tuesday, December 3, 2019 at 7:29 PM
Focus Area Tags: Agriculture, Economic Development, Environment, Innovation, Pest Management

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