12. Conserve Beneficial Insects |
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Some bugs are on the side of homeowners. They are the natural enemies
of damaging insects and are known as beneficial insects. Releasing
beneficial insects into your yard or garden may have some benefit,
but your best bet is to conserve the beneficials already there.
Keeping beneficial insects alive may help keep pest problems at
an acceptable level so you can reduce insecticide use.
To conserve beneficial insects, you first need to know how to identify
them. Presented here are some common beneficial insects.
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Pictured are green lacewings eating aphids.
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Pictured
is a praying mantis. |
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Pictured are wasp eggs on tobacco hornworm.
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Pictured
is a syrphid fly. |
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An important way to conserve beneficials is to treat yards and gardens
with insecticides only when pest populations are great enough to cause
significant damage. Many insecticides are nonspecific, which means
they kill all insects, including the ones you want to keep. In addition,
use the most accurate application methods you can. |
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Although
most insecticides are not selective enough to kill only the particular
insect you have targeted, shop carefully to find one that is more
specifically aimed at your pest problem. Insecticides that must be
applied directly to the insect or that break down quickly on treated
surfaces kill fewer beneficial insects.
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Beneficial
insects are often slow to colonize a yard. The best way to make sure
they are nearby is to maintain their natural habitats. You can do
this by maintaining a diversity of plantings. |
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Adults of some beneficial insects need to feed on pollen and nectar.
Plants with very small flowers and some flowering weeds, such as some
clovers and Queen Anne’s lace, in and around the yard may help
preserve a diversity of insect life. In addition, artificial food
supplements that contain yeast, whey proteins, and sugars can attract
or increase the numbers of beneficial insects. |
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Keep
in mind that maintaining habitats and providing artificial food can
attract pests as well as beneficial insects. Also, although it is
important to bring pest populations below damaging levels, it is not
necessary to completely eradicate undesirable insects. In fact, leaving
some pests alive will help maintain the populations of beneficial
insects. |
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In
many cases, conserving beneficial insects will provide natural control
of insect pests. But natural control does have its limitations. Predators
and parasites work slowly. It may take weeks or even seasons for beneficial
insect populations to build up. Also, you are always left with at
least a few undesirable insects in the yard. |
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