IT'S APHID SEASON - OH
BOY ! ! !
and the little monsters are back on my roses
in full force

So , , , where do they come from ? and how can I get rid of them
FOR GOOD ? ? ?
The remarkable life cycle of aphids helps to explain
how they can quickly appear in large numbers. In the temperate
climates of spring, female aphids called "stem mothers,"
emerge from "overwintering" eggs. These plump, distinctive-looking
aphids do not need to mate to reproduce.
How about that? These characteristics contribute to the tendency
of aphid populations to "explode." When the weather
is warm, many species of aphids can develop from newborn nymph
to reproducing adult in 7 to 8 days. Because each adult aphid
can produce up to 80 offspring in a matter of a week, aphid populations
can increase pretty PDQ (pretty darn quick).
"Stem mothers" give birth to live daughters, and these
offspring give birth to more live daughters - all without
the need of mating. The swiftly growing female aphid
colonies cluster around the stem mother and continue to multiply
long after her death. This 'family' is what you see on your buds
and tender new growth. At the end of the season, aphids begin
to produce both sons and daughters. When these males and females
mature, they mate and the females lay eggs on bud scales
or bark to "overwinter"
and begin the cycle again. So, now you know where they come from,
I HAVE BEEN RAISING THEM ! !
Signs of an aphid infestation include honeydew or sooty mold on
leaves, yellow spots on upper leaf surfaces, cast skins on leaves,
curling of leaves, and distortion of new growth and ants on your
plants. Argentine ants love honeydew, and to ensure a continuing
supply, they protect aphids from their natural enemies. When this
happens, aphid management must include ant management.
WHAT'S A PERSON TO DO TO
GET RID OF THEM
OR AT LEAST CONTROL THE POPULATION ?
Wipe off or prune away colonies
of aphids from leaves and buds.
Use a forceful stream of plain water to wash
off aphids and honeydew.
Use insecticidal soaps to kill aphids on contact
and spare the beneficials such as lacewings. These products do
not leave toxic residues.
Use spray (horticultural) oils to control aphids
without leaving toxic residues for their natural enemies.
Attract beneficials to your garden
by planting a wide variety of flowering plants. The adult forms
of many beneficial insects, including parasitic
mini-wasps and lacewings,
feed on pollen and nectar.
Learn to recognize beneficial insects.
Among the most important natural enemies of aphids
are the mini-wasps
("parasitoids") that lay their eggs inside the bodies
of aphids. These tiny wasps cannot sting people. A parasitized
aphid (called a "mummy") looks puffed-up, and its skin
hardens and changes color, often to tan, light brown, or black.
Consider buying beneficial insects.
Lacewings are more likely to stay
in your garden than commercially available ladybugs.
Researchers found that lacewings performed
better in hot temperatures, while aphid
midges and lady beetles were better in cooler temperatures.
Buy beneficials before aphid numbers
are high. If you have an aphid emergency, first
use soap or oil sprays to reduce the population. Then, if necessary,
release natural enemies. On the other hand, don't purchase beneficial
insects before you have aphids. You will be releasing them into
your garden to starve.
The least-toxic pesticides used against aphids
include insecticidal soap, horticultural oil,
and botanical insecticides such as neem or natural
pyrethrums.
Horticultural Oil, Dormant Oil suffocates certain
pests, such as aphids, mites, mealybugs and scale.
The difference between 'summer', 'verdant', or 'growing season'
oils and 'dormant oils' is the viscosity. Dormant oil is thicker,
summer oil is thinner, which may just be the rate at which it
is mixed with water by the gardener. Both are considered an organic
pesticide by many gardeners.
My favorite is spraying them off with the water hose and sometimes
a simple mixture of Ivory Dishwashing Detergent and water, sprayed
directly on the aphids. The soap in the solution
strips soft bodied insects of their essential fluids, causing
them to dry out quickly and die. Because of this drying action,
refrain from using this spray directly on your plants.
It can sometimes harm them more than the pests would have.
An alternative recipe for the spray is a solution
of water, and a squirt of dish soap mixed with hot garlic and/or
peppers pureed in a blender. Spray the aphids each time you see
them.
Ants are attracted by and eat the
secretion left by aphids. When you see ants on the plant, you
have aphids.

Apply a product called Tanglefoot in a band around the trunk just
above the ground. (Tip: Put it on Duct Tape,
not the tree trunk). Also, I kill ants by pouring big pans of
boiling water into their home at the first light of dawn, because
they're home then. If you do this when they're not home they will
just build another home somewhere else in your yard. I use a product
called Amdro if the ant home is close to a plant where the roots
might get damaged by boiling water.
Visit your local garden center and plant some of the flowers and
herbs named in the box on the right where you have aphids. You
will brighten up your garden and invite those wonderful beneficial
insects to do your dirty work.
So, , , How can I get rid of them for good? I can't. But a few
aphids won't ruin my garden. So I will plant more flowers and
herbs, that attract the beneficial insects and I'll wipe-off or
wash-off the aphids from my plants. I will use dormant oil in
the winter to prevent the overwintering eggs from hatching, then
wait and see what visits my garden in the springtime.
| Plant |
Beneficials Attracted |
Anise (Pimpinella anisum)
|
Ladybugs, parasitic mini-wasps,
tachinid flies |
Basket-of-Gold (Aurinia saxatilis)
|
Ladybugs, hoverflies
|
Bee Balm (Monarda spp.)
|
Bees, parasitic mini-wasps,
beneficial flies |
Coreopsis (Coreopsis tinctoria)
|
Spined soldier bugs, hoverflies, tachinid flies |
Cosmos (Cosmos bipinnatus)
|
Parasitic mini-wasps,
hoverflies, tachinid flies, bees |
Dill (Anethum graveolens)
|
Lacewings, hoverflies,
ladybugs, parasitic mini-wasps,
tachinid flies
|
Fennel (Foeniculum vulgare)
|
Lacewings, hoverflies,
ladybugs, parasitic mini-wasps,
tachinid flies
|
Feverfew (Tanacetum parthenium)
|
Hoverflies
|
Golden Marguerite (Anthemis tinctoria)
|
Lacewings, ladybugs,
hoverflies, parasitic mini-wasps,
tachinid flies
|
Lovage (Levisticum officinale)
|
Beneficial wasps, ground beetles
|
Painted Daisy (Chrysanthemum coccineum)
|
Tachinid flies, parasitic mini-wasps
|
Sweet alyssum (Lobularia maritima)
|
Hoverflies
|
Tansy (Tanacetum vulgare)
|
Ladybugs, predatory wasps, many other beneficials
|
Yarrow (Achillea spp.)
|
Lacewings, hoverflies, ladybugs, parasitic mini-wasps
|
Zinnia (Zinnia elegans)
|
Ladybugs, parasitic mini-wasps, bees
|
|
|