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With spring green comes aphids


Aphids are just starting to collect on the top of this bud on
a McCartney rose. A blast of water will knock them off.
(Photos: Kathy Morrison)
How to cope with these pests without chemicals



With the first warm days of spring (after so much rain), expect rapid growth in your garden – and aphids.

These pests flock to tender green shoots and buds. Roses in particular are vulnerable, but aphids also attack cabbage, tulips and a wide range of other plants.

Usually, aphids start being problematic earlier in March. But recent storms and colder than normal temperature have kept their populations down.

That will end very soon, probably this weekend.

Aphids feed by sucking the juices out of plants. They like new growth and flower buds best because the outer cell walls are thinner and therefore easier to eat. The faster the growth, the thinner the walls.

Applications of high-nitrogen liquid fertilizers speed that growth even more. As plants respond to these nutrients, they often attract more aphids.

How can aphids become such a problem so quickly? One mature female can produce 12 offspring a day – without mating.

Lady beetles can help keep the aphids under control, but they can't
do it alone once the population gets growing.
Beneficial insects such as lady beetles or praying mantis like to feast on aphids, but they can’t contain a rapidly growing onslaught. Encourage the good bugs, while also giving them a hand without harmful chemicals.

Knock down spring aphid infestations with water. A strong blast from the hose can knock them right off; soft-bodied aphids can’t survive the fall.

Other aphid-fighting solutions are more effective at the first sign of outbreaks. Puree 2 cloves of garlic and mix into 2 cups of water; put in a spray bottle and blast the bugs.

Or add 1 teaspoon of mild dish soap (such as liquid Ivory or Dr. Bronner’s pure-castile or peppermint liquid soap) to 2 cups of water in a spray bottle, then spray away.

Or just squish them. Wear gloves and lightly stroke them off buds. (This works well on roses.)

If aphids persist, look for ants. They may be introducing aphids to plants (particularly shrubs or trees), then “milking” them for honeydew. That honeydew often forms a black sooty mold.

To deter the ants, put sticky Tanglefoot or other barrier around the stem or trunk of the shrub or tree to dissuade ants from herding aphids onto that plant.

For more on aphids, check out this advice from the University of California pest management program:

http://ipm.ucanr.edu/PMG/PESTNOTES/pn7404.html

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Garden checklist for week of July 12

Get out early in the morning to take care of garden chores. Temperatures are expected to stay below 80 degrees before 10 a.m.

* Remember to water early and deep; your garden depends on you.

* It’s not too late to add a splash of color. Plant petunias, snapdragons, zinnias and marigolds.

* From seed, plant corn, pumpkins, radishes, winter squash and sunflowers.

* Keep your vegetable garden watered, mulched and weeded. Water before 8 a.m. to reduce the chance of fungal infection and to conserve moisture.

* Water before fertilizing vegetables and blooming annuals, perennials and shrubs to give them a boost. Feeding flowering plants every other week will extend their bloom.

* Feed vegetable plants bone meal or other fertilizers high in phosphate to stimulate more blooms and fruiting.

* Don’t let tomatoes wilt or dry out completely. Give tomatoes a deep watering two to three times a week. Harvest vegetables promptly to encourage plants to produce more. Squash especially tends to grow rapidly in hot weather. Keep an eye on zucchini.

* If your melons and squash aren’t setting fruit, give the bees a hand. With a small, soft paintbrush, gather some pollen from male flowers, then brush it inside the female flowers, which have a tiny swelling at the base of their petals. (That's the embryo melon or squash.) Within days, that little swelling should start growing.

* Pinch back chrysanthemums for bushy plants and more flowers in September.

* Remove spent flowers from roses, daylilies and other bloomers as they finish flowering.

* Pinch off blooms from basil so the plant will grow more leaves.

* Cut back lavender after flowering to promote a second bloom.

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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