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These little pests love hot, dusty, dry conditions


Spider mites can quickly turn a green leaf into a speckled mess. Fight them with water! (Photos courtesy UC Integrated
Pest Management)

To fight spider mites, use water, not pesticides



These itsy-bitsy spider cousins are making a mess.

Recent hot weather has brought out the spider mites, tiny arachnids that attack a wide range of edible and ornamental plants. Right now, they’re really going after roses, covering the underside of leaves with white webs and sucking the life out of foliage.

According to the UC Cooperative Extension master gardeners, spider mites also attack many fruit trees, vines, berries, vegetables and other ornamental plants. Look for the telltale webbing.

The spider mites themselves are teeny-tiny, no bigger than the period at the end of this sentence. When shaken from a leaf onto a sheet of paper, they look like fast-moving dots.

They love hot, dry, dusty conditions. May’s early heat wave brought them out in force. They can multiply quickly, producing a whole generation in a week. If left undisturbed, they can overwhelm plants. They’re especially bad during drought conditions and can do the most harm to water-stressed plants.

The key to their control? Water. By keeping plants well hydrated and dust down, spider mites are a lot more manageable. In addition, they have many natural predators in the garden. By August, the good guys usually can keep the spider mite population in check.

Unless you apply a broad spectrum pesticide. That kills the good bugs while leaving the spider mites free to weave their webs of destruction.
This is an advanced case of spider mite damage.

Besides attacking roses, spider mites can cause fruit trees to lose their leaves in spring and early summer. The damage at first looks a little like peach leaf curl with foliage developing stipples and turning yellow or red before falling off. Except spider mites attack a lot more than peaches and the fallen leaves usually show signs of that white webbing.

In the vegetable garden, they attack the leaves of squash and melons, potentially leading to sunburn. They also like beans, munching the pods as well as leaves.

Early signs of spider mite damage are stippling and yellowing of leaves. Turn a suspect leaf over and look for the white webbing. Remove and dispose of that infested leaf. Then, spray the bush with water, washing dust off leaves (along with some spider mites, too).

Insecticidal soap also can be effective in nipping a spider mite infestation in the bud. Make sure to spray the underside of leaves.

For more tips and details, see the UC IPM pest notes on spider mites:
http://ipm.ucanr.edu/PMG/PESTNOTES/pn7405.html

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Flowers in My Back Yard Series

Aug. 25: Crape myrtles, Sacramento's unofficial tree of summer

Aug. 18: Pollinators adore scabiosa, aka pincushion flower

Aug. 11: Hardy hibiscus adds big tropical impact

Aug. 4: Dianthus a deceptively hardy flower

July 28: Naked Ladies put on summer show

July 21: Thank Luther Burbank for these long-lasting beauties (Shasta daisies)

July 14: How to keep hydrangeas happy

July 7: Grow these bright cosmos for bees and butterflies

June 30: Agapanthus adds blue fireworks to the garden

June 23: Easy-care gazanias fill those hot corners

June 16: Daylilies are perfect for water-wise gardens (and a lot more)

June 9: Grow coneflowers for pollinators -- and yourself

June 2: Sunflowers capture Sacramento's summer attitude

May 29: Are your roses going 'blind'?

May 26: Zinnias are the summer flowers every garden needs

May 19: Plant dahlias now for late-summer flower power

May 12: Know your coreopsis from your bidens

May 5: Mums the word on Mother's Day weekend

April 28: Majestic Matilija poppy is worth a look

April 21: Celebrate roses, America's favorite flower

April 14: Small flowers with outsized impact

April 7: Calendulas do double duty

April 3: Make Easter lilies last for years to come

March 31: In praise of a pollinator magnet (small-leaf salvias)

March 24: Azaleas brighten shady spots

March 17: The perfect flower for beginners? Try zonal geraniums

March 10: Keep camellias happy for years to come

March 3: Fruit tree blossoms are a fleeting joy

Feb. 27: Are your roses looking rusty?

Feb. 24: Treasure spring daffodils now and for years to come

Feb. 17: How and why to grow wildflowers

Feb. 10: Let's talk Valentine's Day roses

Feb. 3: Why grow flowers?

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Taste Summer! E-cookbook

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Find our summer recipes here!

Garden checklist for week of Aug. 16

During this break in the heat, feed your garden. Make sure to water before and after applying fertilizer.

* In the garden, direct seed beets, carrots, leaf lettuce and turnips.

* Plant potatoes.

* Harvest tomatoes, beans, squash, pepper and eggplants to prompt plants to keep producing. Give your plants a deep watering twice a week, more if planted in containers. Also, give them a boost with phosphate-rich fertilizer to help fruiting.

* Watch out for caterpillars and hornworms in the vegetable garden. They can strip a plant bare in one day. Pick them off plants by hand in early morning or late afternoon.

* Feed citrus trees their last round of fertilizer for the year. This will give a boost to the fruit that’s still small.

* Mulch can be your garden’s best friend – it conserves moisture while blocking out weeds. But don't let mulch mound around stalks, stems or trunks. That can promote rot.

* Camellia leaves looking a little yellow? Give them some chelated iron. That goes for azaleas and gardenias, too.

* Pick up after your fruit trees. Clean up debris and dropped fruit; this cuts down on insects and prevents the spread of brown rot. Then feed fruit trees with slow-release fertilizer for better production for next year.

* To prolong bloom into fall, feed begonias, fuchsias and container plants. Always water before fertilizing.

* Fertilize fall-blooming perennials, too. Chrysanthemums can be fed until the buds start to open.

* Prepare for a fall full of flowers by paying a little extra attention to your garden. Cut off spent blooms from roses, annuals and perennials, then give them a boost of fertilizer. Make sure to water plants before feeding. Roses will rebloom about six to eight weeks after deadheading.

* Indoors, start seedlings for fall vegetable planting, including bunching onion, cabbage, broccoli, cauliflower, kale, radicchio and lettuce.

* Sow seeds of perennials in pots for fall planting including yarrow, coneflower and salvia.

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Taste Spring! E-cookbook

Strawberries

Find our spring recipes here!

Taste Fall! E-cookbook

Muffins and pumpkin

Find our fall recipes here!

Taste Winter! E-cookbook

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Find our winter recipes here!

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

Add asparagus to your edible garden

Soggy soil and what to do about it

Plant artichokes now; enjoy for years to come

It's late November, and your peach tree needs spraying

What to do with all those fallen leaves?

Prepare now for colder weather in the edible garden

Plant a pea patch for you and your garden

As citrus season begins, advice for backyard growers

Change is in the autumn air 

We don't talk (enough) about beets

Fava beans do double duty

Seeds or transplants for cool-season veggies?

How to prolong the fall tomato harvest 

SUMMER

Time to shut it down? 

How to get the most out of your pumpkin patch

Summer-to-fall transition time for evaluation, planning

To pick or not to pick those tomatoes?

: Put worms to work for you

Grow food while saving water

Enhance your food with edible flowers

Why won't my tomatoes turn red?

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

Does this plant need water?

 Tear out that sad plant or baby it? Midsummer decisions

How to grow summer salad greens

 Weird stuff that's perfectly normal

SPRING

Help pollinators help your garden

Battling early-season tomato pests

Make your own compost

Where are the bees when you need them?

How to help tomatoes thrive on hot days

Your plants can tell you more than any calendar can

Maintain soil moisture with mulch for garden success

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

Should you stock up on fertilizer? (Yes!)

Grow culinary herbs in containers

When to plant summer vegetables

Don't be fooled by these garden myths

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