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Sacramento County resumes battle with Japanese beetle

Neighborhoods in Arden-Arcade and Rancho Cordova to be treated

Japanese beetle
Japanese beetles often are confused with June bugs, which are twice the size. (Photo courtesy California Department of Food and Agriculture)


Sacramento County is getting the jump on Japanese beetles. Before any new bugs are detected this spring, crews are treating neighborhoods in Arden-Arcade and Rancho Cordova in hope of breaking the life cycle of this highly destructive, invasive pest.

On Monday, Sacramento County announced it would start beetle treatments, the second year of an eradication program triggered by the detection of Japanese beetles in those neighborhoods. Impacted property owners will be notified in advance, the county says.

In past years, a few beetle sightings have triggered quarantines and spraying. But the last two years have brought a bevy of bad beetles.

Between June 4, 2020, and Aug. 9, 2021, a total of 231 Japanese beetles were trapped in the communities of Arden-Arcade and Rancho Cordova, Sacramento County,” according to the California Department of Food and Agriculture. “Unless emergency action is taken to disrupt the JB life cycle, there is a high potential for sudden future detections in Sacramento County and other areas.”

With shiny copper-toned wing covers and green heads, Japanese beetles look like little scarabs. They’re small – only 1/3 to ½ inch long – but are often confused with fig beetles or June bugs, which are both about twice the size of Japanese beetles.

So far, California has repeatedly fought off infestations of Japanese beetles, which are well established on the East Coast. But these Sacramento County bugs have been a challenge.

Traps were set out last summer in a 49-square-mile area of Sacramento County to monitor Japanese beetle activity. Instead of numbers going down, they went up.

(After review of data), I have determined that an infestation of Japanese beetle exists in the area, and poses a statewide significant imminent danger to California’s commercial fruit and berry production, residential fruit plantings, natural resources, and the economy,” wrote Karen Ross, California’s Secretary of Food and Agriculture.

Adults feed on the foliage and fruits of several hundred species of fruit trees, ornamental trees, shrubs, vines, and field and vegetable crops,” Ross said in her declaration. “Among the plants most commonly damaged are apple, pears, caneberries, pears, blueberries, cherries, plums, corn, rose, grape, crabapple, turf grass and beans.”

All that adds up to bad news if these beetles become established in the Central Valley.

Among the worst turf-grass pests, Japanese beetle larvae feed on the roots of lawns. Golf courses, parks and playgrounds are particularly susceptible and can act as nurseries for the baby beetles. The eradication effort includes treating lawns and ground covers with Acelepryn (also known as chlorantraniliprole).

The treatment areas include two islands in Arden-Arcade: An Edison Avenue neighborhood mostly between Becerra Way and Norris Avenue; and a larger area surrounding Watt Avenue from William Way to Marconi Avenue, including all of the Del Paso Country Club.

Likewise, two islands located within Rancho Cordova will be treated: The neighborhood surrounding Corvina Drive near Zinfandel Drive; and neighborhoods on both sides of Highway 50 from Mather Field Road to White Rock Road.

This eradication program is expected to continue through 2024 until state and county officials can determine if Sacramento County is Japanese beetle free.

For more information, contact the Sacramento County agriculture commissioner’s office at 916-875-6603 or CDFA’s Pest Hotline at 800-491-1899.

For details, https://www.cdfa.ca.gov/plant/JB/treatment/


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Dig In: Garden checklist for week of Jan. 29

Bundle up and get work done!

* Prune, prune, prune. Now is the time to cut back most deciduous trees and shrubs. The exceptions are spring-flowering shrubs such as lilacs.

* Now is the time to prune fruit trees, except apricot and cherry trees. Clean up leaves and debris around the trees to prevent the spread of disease.

* Prune roses, even if they’re still trying to bloom or sprouting new growth. Strip off any remaining leaves, so the bush will be able to put out new growth in early spring.

* Prune Christmas camellias (Camellia sasanqua), the early-flowering varieties, after their bloom. They don’t need much, but selective pruning can promote bushiness, upright growth and more bloom next winter. Feed with an acid-type fertilizer. But don’t feed your Japonica camellias until after they finish blooming next month. Feeding while camellias are in bloom may cause them to drop unopened buds.

* Clean up leaves and debris around your newly pruned roses and shrubs. Put down fresh mulch or bark to keep roots cozy.

* Apply horticultural oil to fruit trees to control scale, mites and aphids. Oils need 24 hours of dry weather after application to be effective.

* This is also the time to spray a copper-based oil to peach and nectarine trees to fight leaf curl. Avoid spraying on windy days.

* Divide daylilies, Shasta daisies and other perennials.

* Cut back and divide chrysanthemums.

* Plant bare-root roses, trees and shrubs.

* Transplant pansies, violas, calendulas, English daisies, snapdragons and fairy primroses.

* In the vegetable garden, plant fava beans, head lettuce, mustard, onion sets, radicchio and radishes.

* Plant bare-root asparagus and root divisions of rhubarb.

* In the bulb department, plant callas, anemones, ranunculus and gladiolus for bloom from late spring into summer.

* Plant blooming azaleas, camellias and rhododendrons. If you’re shopping for these beautiful landscape plants, you can now find them in full flower at local nurseries.

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