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Dreaded Japanese beetles found at two Sacramento County sites


Japanese beetles are serious destructive pests. Hundreds of traps are now out in a 49-square-mile area. (Photo courtesy Sacramento County Agricultural Commission)

Trapping follows discoveries in Rancho Cordova, Arden-Arcade




America’s No. 1 turf pest is trying to invade Sacramento – again. But much more than lawn is at stake. This bad bug is a major threat to California agriculture, too; it can destroy more than 300 crops including wine grapes, citrus and stone fruit. And it really likes roses, too.

The dreaded Japanese beetle has been discovered in two locations in Sacramento County, triggering a massive trapping campaign.

According to the Sacramento County Agricultural Commissioner and the California Department of Food and Agriculture, a total of 19 Japanese beetles – eight in Arden-Arcade and 11 in Rancho Cordova – were recently found. Those initial detections were confirmed June 4, the county announced Tuesday.

This week, state and county staff placed hundreds of green plastic traps over a 49-square-mile area. Those beetle traps will be monitored daily within a mile of the initial sightings; weekly farther away.

Most of the traps are placed near Japanese beetles’ favorite domain – lush green lawn. Its grubs devour the roots of turf grasses, causing an estimated $250 million in damage annually, according to the USDA.

As their name implies, Japanese beetles are native to Japan, where they are not considered a pest. Natural predators keep their numbers in check. But in North America, Japanese beetles have found an unlimited buffet with no predators to stop them. And they eat their entire lives; below ground as larvae on roots, and above ground as adults on fruit and foliage, which they skeletonize.

“Among the plants most commonly damaged are apple, pears, cherries, corn, grapes, roses and turfgrass,” said the county’s announcement. “Adults leave behind skeletonized leaves and large, irregular holes. The grubs develop in soil, feeding on the roots of various plants and grasses and often destroying turf in lawns, parks, golf courses and pastures.”

Sacramento County residents are urged to be on the lookout for this pest. The Arden-Arcade discovery was made near the intersection of Watt and Whitney avenues.

According to the CDFA website, these are the first Japanese beetles to be detected in Sacramento County neighborhoods since 2017 when one beetle was trapped in Fair Oaks.

The adults appear in June and July before tunneling back underground to lay eggs. Those eggs hatch in late summer and the larvae spend the next nine months eating roots.

This is a fig beetle or green fruit beetle,  which is sometimes
mistaken  for a Japanese beetle. But it's nearly twice as large as the
invasive pest -- up to 1-1/3 inches long. (Photo courtesy UC IPM)

About a half-inch long with bronze iridescent wings, Japanese beetles look a lot like other beetles common in Sacramento in early summer, including fig, hoplia and June beetles. But the Japanese beetle is a lot more destructive. Among the trees at highest risk: Japanese maple, crape myrtle, apple, stone fruit (peach, plum, apricot, pluot, cherry etc.), pin oak, linden, birch, black walnut, Lombardy poplar and willow.

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Garden checklist for week of April 19

After this midweek storm, start getting serious about spring gardening. Flowers are blooming about three weeks ahead of schedule. That includes weeds!

* Get ready to swing into action in the vegetable garden – if you haven’t already. As nights warm up over 50 degrees, set out tomato, pepper and eggplant transplants.

* From seed, plant beans, beets, cantaloupes, carrots, corn, cucumbers, melons,  radishes and squash; wait on pumpkins until May. Plant onion sets.

* In the flower garden, plant seeds for asters, cosmos, celosia, marigolds, salvia, sunflowers and zinnias. Transplant petunias, zinnias, geraniums and other summer bloomers.

* Plant perennials and dahlia tubers for summer bloom. Late April is about the last chance to plant summer bulbs, such as gladiolus and tuberous begonias.

* Transplant lettuce and cabbage seedlings.

* April is the last chance to plant citrus trees such as dwarf orange, lemon and kumquat. These trees also look good in landscaping and provide fresh fruit in winter.

* Smell orange blossoms? Give citrus trees a low dose of balanced fertilizer (such as 10-10-10) during bloom to help set fruit. Keep an eye out for ants. If leaves look yellow, your tree may need an iron boost -- apply some chelated iron fertilizer.

* Apply slow-release fertilizer to the lawn.

* Thoroughly clean debris from the bottom of outdoor ponds or fountains.

* Spring brings a flush of rapid growth, and that means your garden needs nutrition. Give shrubs and trees a slow-release fertilizer. Mulch with a 1-inch layer of compost, which helps the soil, but keep it a few inches away from trunks and stems.

* Azaleas and camellias looking a little yellow? If leaves are turning yellow between the veins, give them a boost with chelated iron.

* Trim dead flowers but not leaves from spring-flowering bulbs such as daffodils and tulips. Those leaves gather energy to create next year's flowers. Also, give the bulbs a fertilizer boost after bloom.

* Pinch chrysanthemums back to 12 inches for fall flowers. Cut old stems to the ground.

* Mulch around plants to conserve moisture and control weeds.

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Food in My Back Yard (FIMBY) Series

Lessons learned during a year of edible gardening

WINTER

Is edible gardening possible indoors?

Hints for choosing tomato seeds

Starting in seed starting

Why winter is the perfect time to plant fruit trees

When to plant? Consider staggering your transplants

How to squeeze more food into less space

Potatoes from the garden

Plant a fruit tree now -- for later

Win the weed war by tackling them in winter

Tips for planting bare-root trees, shrubs and vegetables

Time to give vegetable seedlings some more space

Ways to win the fight against weeds

FALL

Dec. 16: Add asparagus to your edible garden

Dec. 9: Soggy soil and what to do about it

Dec. 2: Plant artichokes now; enjoy for years to come

Nov. 25: It's late November, and your peach tree needs spraying

Nov. 18: What to do with all those fallen leaves?

Nov. 11: Prepare now for colder weather in the edible garden

Nov. 4: Plant a pea patch for you and your garden

Oct. 27: As citrus season begins, advice for backyard growers

Oct. 20: Change is in the autumn air 

Oct. 13: We don't talk (enough) about beets

Oct. 6: Fava beans do double duty

Sept. 30: Seeds or transplants for cool-season veggies?

Sept. 23: How to prolong the fall tomato harvest 

SUMMER

Sept. 16: Time to shut it down? 

Sept. 9: How to get the most out of your pumpkin patch

Sept. 2: Summer-to-fall transition time for evaluation, planning

Aug. 26: To pick or not to pick those tomatoes?

Aug. 19: Put worms to work for you

Aug. 12: Grow food while saving water

Aug. 5: Enhance your food with edible flowers

July 29: Why won't my tomatoes turn red?

July 22: A squash plant has mosaic virus, and it's not pretty

July 15: Does this plant need water?

July 8: Tear out that sad plant or baby it? Midsummer decisions

July 1: How to grow summer salad greens

June 24:  Weird stuff that's perfectly normal

SPRING

June 17: Help pollinators help your garden

June 10: Battling early-season tomato pests

June 3: Make your own compost

May 27: Where are the bees when you need them?

May 20: How to help tomatoes thrive on hot days

May 13: Your plants can tell you more than any calendar can

May 6: Maintain soil moisture with mulch for garden success

April 29: What's (already) wrong with my tomato plants?

April 22: Should you stock up on fertilizer? (Yes!)

April 15: Grow culinary herbs in containers

April 8: When to plant summer vegetables

April 1: Don't be fooled by these garden myths

March 25: Fertilizer tips: How to 'feed' your vegetables for healthy growth