The main beneficial nematodes are Steinernema carpocapsae and
Heterorhabditis bacteriophora. If you have these two handy to spread on
your property then most of the harmful insects will be taken care of.
However, there are others that seem to specialize as to insects they
iradicate. Although there is a right beneficial nematode for that
varmit you want out of your lawn and garden there is not a way right now
to get them all commerically. Here are the others listed and their main dish.
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STEINERNEMA- will sit and wait for their meal.
Steinernema carpocapsae--probably the most important of the
beneficial nematodes. Easy to reproduce and last for months in
proper storage.
Steinernema feltiae: Attacks primarily mushroom flies, fungus gnats,
and tipulids. This nematode is unique in maintaining infectivity at soil
temperatures below 10°C. S. feltiae offers lower stability than other
steinernematids.
Steinernema glaseri: The largest beneficial nematode at twice
the length but eight times the volume of S. carpocapsae infective
juveniles. Attacks scarabs. This species can provide control of several
scarab species. The large size, however, reduces yield, making this
species more expensive to produce than other species.
Steinernema kushidai: From Japan and only known to parasitize scarab
larvae. Still in development and have been highly promising then it too can
be mass produced and commercialized.
Steinernema riobravis: Isolated to date only from the Rio Grande Valley
of Texas, possesses several features. It is effective across multiple insect
orders. This beneficial nematode is effective against corn earworm
and mole crickets. Works well under arid conditions and on one occasion
in treated annually for control of citrus root weevil with impressive results.
Steinernema scapterisci: From Uruguay and used in the USA to
suppress adult mole crickets. Commercially available since 1993, this
nematode is also sold as a biological insecticide.
HETERORHABDITIDS- do well against soil pests that are not as mobile
because these beneficial nematodes actively search for hosts
deeper in the soil profile.
Heterorhabditis bacteriophora: Among the most important nematodes,
H. bacteriophora attack insect larvae especially root weevils. Is less
effective in cooler temperatures so use above 20 degrees C.
Heterorhabditis megidis: This large beneficial nematode is
marketed in western Europe for control of black vine weevil and various
other soil insects.
When to apply and how: Most important is timing.
Find a reputable supplier
Know when the varmit insect is present in or on the soil
Two applications may be necessary
Keep beneficial nematodes stored properly until use
Apply as soon as possible after purchase.
They need moisture for movement in the soil so water before and after
application.
Apply in early evening or early morning as high temperatures kill the
nematodes. Best in soil that is between 60-90 degrees F.
Apply with watering cans, sprayers or pump sprayers.
Beneficial nematodes are safe for plants and animals (worms,
birds, pets, children).
With organic fertilizers you need no special precautions but with
inorganic fertilizers there are-so check label.
Use S. carpocapsae on:
Artichokes for Artichoke plume moth
Cranberries for Cranberry Root weevils
Cranberries for Cranberry girdler
Billbugs
Armyworms
Cutworms
Webworms
Wood borers
Use S. riobravis on:
Citrus Root weevils
Mole crickets
Use S. feltiae on:
Mushroom sciarids
Fungus gnats
Use S. scapterisci on:
Mole crickets
Use H. bacteriophora on:
Berries Root weevils
Cranberries Root weevils
Wood borers
Turf Scarabs
Billbugs
Ornamentals Root weevils
Use H. megidis on:
Ornamentals Root weevils
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