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Hot weather brings out spider mites, mosquitoes

Sacramento Digs Gardening
BY Debbie Arrington PUBLISHED JUL 13, 2020

Telltale webbing of spider mites covers this spirea. The cure? Water. (Photo: Debbie Arrington)

Watch out for sunburned plants, too

Recent blazing hot weather has brought out heat-related pest and garden issues – while making other problems disappear.

First the good news: Gone is powdery mildew. It can’t survive in this heat. We shouldn’t see another outbreak of this fungal disease until October or later.

Also unable to cope with triple-digit temperatures are immature brown marmorated stink bugs and leaf-footed bugs. This heat wave likely toasted a whole generation of these destructive pests. That also means fewer bad bugs in August.

But some pests like it hot.

These tomato leaves show stippling by spider mites.
(Photo: Kathy Morrison)

With no rain for weeks, it’s also dry and dusty – perfect conditions for spider mites. If you see their telltale webs or stippling on leaves, get out the hose. Wash the plant down, removing the dust and likely many mites.

Spider mites attack a wide range of plants including roses, fruit trees, berries, grapevines, beans, squash, melons, tomatoes and more. Miticides are not recommended; they kill many beneficial insects in addition to the mites, which often manage to evade pesticide sprays.

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

Also out in force now are mosquitoes, which are a threat to people and pets as well as wildlife. According to the state’s West Nile Virus website, five dead birds found in Sacramento County last week tested positive for WNV. That brings the 2020 county total to 12. Four more Sacramento County mosquito samples last week tested positive, too, bringing that total to six.

County officials urge residents to be alert for dead birds and report them to the WNV bird hotline, 1-877-WNV-BIRD (1-877-968-2473).

Protect yourself, too. Wear mosquito repellent when working outdoors. At dawn and dusk when mosquitoes are most active, wear long sleeves and long pants.

For more info and the latest WNV statistics, visit https://westnile.ca.gov .

While most plants need full sun, too much sun (and heat) can cause problems, too.

A plastic plant flat serves as shade for a Patio Yellow potted tomato plant.

(Photo: Kathy Morrison)

Just like people, plants can get sunburned. If you notice crispy edges to leaves or pale patches on ripening tomatoes and peppers, that plant may need some shade. Construct a temporary shade structure to give plants some relief. It can be as simple as cardboard pieces on top of a tomato cage or burlap loosely draped over stakes.

Sunburn also can damage bark, especially on young trees or shrubs, opening up the plant to wood-boring pests and premature death. It tends to be worse on the west- and south-facing sides of plants. Painting the trunk and exposed lower limbs with diluted interior white latex paint (1:1 dilution with water) can protect a young tree's bark.

Besides a little shade, consistent irrigation can help plants survive too much sun.

For more tips on helping your garden deal with sunburn, see the advice of UC Cooperative Extension experts at http://ipm.ucanr.edu/PMG/GARDEN/ENVIRON/sunburn.html .

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Keywords:

Sacramento spider mites pests heat wave heat stress heat pest irrigation mosquitoes gardening summer garden heat high heat summer

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Garden checklist for week of Aug. 2

Get out early in the morning and monitor your garden’s moisture needs. Deep water and add temporary shade structures for plants that are feeling a little burned. In particular, protect developing peppers and eggplant.

* Put off fertilization until this heat passes; plants need to concentrate on hydration instead of growth.

* 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.

* 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.

* 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.

* Pinch off dead flowers from perennials and annuals to lengthen their summer bloom.

* Pick up after your fruit trees. Clean up debris and dropped fruit; this cuts down on insects and prevents the spread of brown rot.

* 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. 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.

* In the garden, direct seed beets, carrots, leaf lettuce and turnips. Make sure to keep seeds and seedlings consistently moist.

* Plant potatoes.

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