This document provides information on identifying and managing common garden snails and slugs. It discusses the most common snail and slug pests in California gardens, including the brown garden snail and gray garden slug. It describes their life cycles, feeding behaviors, and ideal hiding places. The document recommends an integrated pest management approach using multiple control strategies, such as removing hiding places, choosing resistant plant varieties, handpicking, traps, barriers, and baits as part of a cultural control program.
The IRAC Mode of Action (MoA) classification provides growers, advisors, extension staff, consultants and crop protection professionals with a guide to the selection of acaricides or insecticides for use in an effective and sustainable acaricide or insecticide resistance management (IRM) strategy.
Rules for inclusion of a compound in the MoA list
Names To be included in the active list, compounds must have, or be very close to having, a minimum of one registered use in at least one country.
when more than one active ingredient in that chemical sub-group is registered for use, the chemical sub-group name is used.
when only one active ingredient is registered for use, the name of that exemplifying active ingredient may be use
order hemiptera is divided in two sub order i.e. Homoptera and Heteroptera. major families of order hemiptera are pentatomodae, coreidae, cimicidae, pyrrhocoreidae, lygaeidae, cicadilidae, delphacidae, aphidae, coccidae, laphopidae, aleurodidae, pseudococcidae, jassidae etc.
Beneficial insects (bugs) are insects that perform valued services like pollination and pest control. The concept of beneficial is subjective and only arises in light of desired outcomes from a human perspective. In farming and agriculture, where the goal is to raise selected crops, insects that hinder the production process are classified as pests, while insects that assist production are considered beneficial. In horticulture and gardening; pest control, habitat integration, and 'natural vitality' aesthetics are the desired outcome with beneficial insects.
Here I would like to inform you on physiology of impulse transmission in insects. I hope this would increase your understanding -------------------------------------------------
The IRAC Mode of Action (MoA) classification provides growers, advisors, extension staff, consultants and crop protection professionals with a guide to the selection of acaricides or insecticides for use in an effective and sustainable acaricide or insecticide resistance management (IRM) strategy.
Rules for inclusion of a compound in the MoA list
Names To be included in the active list, compounds must have, or be very close to having, a minimum of one registered use in at least one country.
when more than one active ingredient in that chemical sub-group is registered for use, the chemical sub-group name is used.
when only one active ingredient is registered for use, the name of that exemplifying active ingredient may be use
order hemiptera is divided in two sub order i.e. Homoptera and Heteroptera. major families of order hemiptera are pentatomodae, coreidae, cimicidae, pyrrhocoreidae, lygaeidae, cicadilidae, delphacidae, aphidae, coccidae, laphopidae, aleurodidae, pseudococcidae, jassidae etc.
Beneficial insects (bugs) are insects that perform valued services like pollination and pest control. The concept of beneficial is subjective and only arises in light of desired outcomes from a human perspective. In farming and agriculture, where the goal is to raise selected crops, insects that hinder the production process are classified as pests, while insects that assist production are considered beneficial. In horticulture and gardening; pest control, habitat integration, and 'natural vitality' aesthetics are the desired outcome with beneficial insects.
Here I would like to inform you on physiology of impulse transmission in insects. I hope this would increase your understanding -------------------------------------------------
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The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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Snails and Slugs Integrated Pest Management
1. PEST NOTES Publication 7427
University of California
Statewide Integrated Pest Management Program
Agriculture and Natural Resources November 2009
Snails and slugs are among the most bothersome pests in many gardens and landscapes. The brown garden snail, Cornu aspersum (formerly Helix aspersa), is the most common snail causing problems in California gardens (Fig. 1). It was introduced from France during the 1850s for use as food. Another troublesome snail is the white garden snail, Theba pisana (Fig. 2). It currently is established only in San Diego County but has been found in Los Angeles and Orange counties as well.
Several species of slugs also cause damage including the gray garden slug (Deroceras reticulatum, formerly Agriolimax meticulatus) (Fig. 3), the banded slug (Lehmannia poirieri), the three-band garden slug (L. valentiana), the tawny slug (Limacus flavus) (Fig. 4), and the greenhouse slug (Milax gagates).
IDENTIFICATION AND BIOLOGY
Both snails and slugs are members of the mollusk phylum and are similar in structure and biology, except slugs lack the snail’s external, spiral shell. These mollusks move by gliding along on a muscular “foot.” This muscle constantly secretes mucus, which facilitates their movement and later dries to form the silvery “slime trail” that signals the presence of either pest.
All land slugs and snails are hermaphrodites, so all have the potential to lay eggs. Adult brown garden snails lay an average of 80 spherical, pearly white eggs (Fig. 5) at a time into a hole in the soil. They can lay eggs up to 6 times a year, and it takes about 2 years for snails to mature. Slugs reach maturity after about 3 to 6 months, depending on the species, and lay clear, oval to round eggs in batches of 3 to 40 beneath leaves, in soil cracks, and in other protected areas.
Snails and slugs are most active at night and on cloudy or foggy days. On sunny days they seek hiding places out of the heat and bright light. Often the only clues to their presence are their silvery trails and plant damage. In areas with mild winters, such as southern coastal locations, snails and slugs can be active throughout the year.
During cold weather, snails and slugs hibernate in the topsoil. During hot, dry periods or when it is cold, snails seal themselves off with a parchmentlike membrane and often attach themselves to tree trunks, fences, or walls.
DAMAGE
Snails and slugs feed on a variety of living plants and on decaying plant matter. They chew irregular holes with smooth edges in leaves and flowers and can clip succulent plant parts. They also can chew fruit and young plant bark.
Because they prefer succulent foliage or flowers, they primarily are pests of seedlings and herbaceous plants, but they also are serious pests of ripening fruits that are close to the ground such as strawberries, artichokes, and tomatoes. They also will feed on foliage and fruit of some trees; citrus are especially susceptible to damage. Look for the silvery mucous trails to confirm slugs or snails caused the damage and not earwigs, caterpillars, or other chewing insects.
MANAGEMENT
A good snail and slug management program relies on a combination of methods. The first step is to eliminate, as much as possible, all places where they can hide during the day. Boards, stones, debris, weedy areas around tree trunks, leafy branches growing close to the ground, and dense ground covers such as ivy are
Integrated Pest Management for Home Gardeners and Landscape Professionals
Snails and Slugs
Figure 1. Brown garden snail.
Figure 2. Adult white garden snail, Theba pisana.
Figure 3. Gray garden slugs with chewing damage and slime trails on leaves.
Figure 4. Tawny slug, also called yellow cellar slug.
2. November 2009 Snails and Slugs
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ideal sheltering spots. It won’t be possible
to eliminate some shelters such as low
ledges on fences, the undersides of wood-en
decks, and water meter boxes, so make
a regular practice of trapping and remov-ing
snails and slugs from these areas.
Locate vegetable gardens or susceptible
plants as far away from snail and slug
hiding places as possible. Reducing hid-ing
places allows fewer snails and slugs
to survive. The survivors congregate in
the remaining shelters, where you can
more easily locate and remove them.
Switching from sprinkler irrigation to
drip irrigation will reduce humidity and
moist surfaces, making the habitat less
favorable for these pests. Choose snail-proof
plants, such as those listed below,
for areas where snails and slugs are
dense. Copper barriers can be useful for
protecting especially susceptible plants.
Though baits can be part of a manage-ment
program, it is better to use them in
conjunction with other habitat modifica-tion,
especially in gardens that contain
plenty of shelter, food, and moisture.
Plant selection can greatly affect how
difficult your battle with snails and
slugs will be. Because snails and slugs
favor seedlings and plants with succu-lent
foliage, you will need to vigilantly
protect these. Some plants these pests
will seriously damage include basil,
beans, cabbage, dahlia, delphinium,
hosta, lettuce, marigolds, strawberries,
and many other vegetable plants. On the
other hand, many plants resist snail and
slug damage including begonias, Cali-fornia
poppy, fuchias, geraniums, impa-tiens,
lantana, nasturtiums, and purple
robe cup flower as well as many plants
with stiff leaves and highly scented foli-age
such as lavender, rosemary, and sage.
Most ornamental, woody plants, and
ornamental grasses also aren’t seriously
affected. If you design your landscape
using snail and slug resistant plants, you
are likely to have very limited damage.
Handpicking
Handpicking can be very effective if
done thoroughly on a regular basis.
At first you should look for snails and
slugs daily, paying careful attention
to potential hiding places. After the
population has noticeably declined, a
weekly handpicking can be sufficient.
To draw out snails and slugs, water the
infested area in the late afternoon. After
dark, search them out using a flashlight,
pick them up (rubber gloves are handy
when slugs are involved), place them in
a plastic bag, and dispose of them in the
trash. You also can put them in a bucket
with soapy water and dispose of them
in your compost pile after they are dead.
Alternatively, crush captured snails
and slugs and leave them in the garden.
Another option for killing slugs you
have collected is to spray them with a
solution of household ammonia diluted
to a 5 to 10% solution in water.
Traps
You can trap snails and slugs beneath
boards or flower pots that you position
throughout the garden and landscape.
Inverted melon rinds also make good
traps. Construct wooden traps using 12-
by 15-inch boards (or any easy-to-han-dle
size) raised off the ground by 1-inch
runners (Fig. 6). The runners make it
easy for the pests to crawl underneath.
Scrape off the accumulated snails and
slugs daily and destroy them; crushing
is the most common method. Don’t use
salt to destroy snails and slugs, since it
will increase soil salinity.
Some people use beer-baited traps
buried at ground level to catch and
drown slugs and snails that fall into
them. Because it is the fermented part
of the product that attracts these pests,
you also can use a sugar-water and
yeast mixture instead of beer. However,
these traps aren’t very effective for the
labor involved. Beer traps attract slugs
and snails within an area of only a few
feet, and you must replenish the bait
every few days to keep the level deep
enough to drown the mollusks. Traps
must have deep, vertical sides to keep
the snails and slugs from crawling out
and a top to reduce evaporation. You
can purchase this type of snail and
slug trap at garden supply stores.
Barriers
Several types of barriers will keep
snails and slugs out of planting beds.
The easiest to maintain are those made
with copper flashing and screen. It is
believed that copper barriers are effec-tive
because the copper reacts with the
slime that snails and slugs secrete, caus-ing
a disruption in their nervous system
similar to an electric shock. When erect-ing
vertical copper screens, it is best to
use ones that are at least 4 inches tall, so
you can bury a portion of it a few inches
below the soil to prevent slugs from
crawling beneath the barrier.
Copper foil (e.g. Snail-Barr) wrapped
around planting boxes, headers, or trunks
(Fig. 7) will repel snails for several years.
When banding trunks, wrap the copper
Figure 5. Snail eggs.
Figure 6. This turned over board trap
reveals snails on its underside.
Figure 7. Copper barriers can keep snails
and slugs out of trees and raised beds.
3. November 2009 Snails and Slugs
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foil around the trunk, tab side down, and
cut it to allow an 8-inch overlap. Attach
one end or the middle of the band to the
trunk with one staple oriented parallel to
the trunk. Overlap and fasten the ends
with one or two large paper clips to al-low
the copper band to slide as the trunk
grows. Bend the tabs out at a 90° angle
from the trunk. If the bands tarnish, you
can clean them with a vinegar solution.
When using copper bands on planter
boxes, be sure the soil within the boxes
is snail free before applying them. If
it isn’t, handpick the snails and slugs
from the soil after applying the band
(but before planting new plants) until
the box is free of these pests. Solarizing
the soil—a technique that uses clear,
plastic tarp and the sun’s heat—is a
good way to kill eggs in raised beds.
Instead of copper bands, Bordeaux
mixture (a copper sulfate and hydrated
lime mixture) or copper sulfate alone
brushed onto trunks will repel snails.
One treatment should last about a year.
Adding a commercial spreader or white
latex paint can help the Bordeaux mix-ture
remain effective for two seasons.
Barriers of dry ashes or other abrasives
heaped in a band 1 inch high and 3
inches wide around the garden also can
be effective. However, these barriers lose
their effectiveness after becoming damp,
making them difficult to maintain and
not very useful in most garden situations.
Natural Enemies
Snails and slugs have many natural en-emies
including ground beetles, patho-gens,
snakes, toads, turtles, and birds,
but most are rarely effective enough
to provide satisfactory control in the
garden. One predator found in some
California gardens is a large Staphyli-nid
beetle called the devil’s coach horse,
Ocypus olens (Fig. 8). However, this
beetle, which is more than 1-inch long,
also will feed on ripening or decaying
fruits and vegetables.
Domesticated fowl—such as ducks,
geese, or chickens—kept penned in
infested areas can be effective snail
predators that significantly reduce
problems. Be careful, though, as these
birds also can eat seedlings.
The predatory decollate snail, Rumina de-collata,
(Fig. 9) has been released in South-ern
California citrus orchards to control
young brown garden snails and is pro-viding
very effective biological control. It
feeds only on small snails, not full-sized
ones. Because of the potential impact of
the decollate snail on certain endangered
mollusk species, it can’t be released in
California outside of Fresno, Imperial,
Kern, Los Angeles, Madera, Orange, Riv-erside,
Santa Barbara, San Bernardino,
San Diego, Ventura, and Tulare counties.
Decollate snails can feed on seedlings,
small plants, and flowers and can be a
nuisance when they cover the back patio
on a misty day. Because snail baits will
kill decollate snails, you shouldn’t use
them where these predators are active.
Baits
Snail and slug baits can be effective
when used properly in conjunction
with a cultural program incorporating
the other methods discussed above.
However, baits alone won’t effectively
control snails or slugs. Baits are toxic to
all snails and slugs, including the pred-atory
decollate snail and native species.
Several types of snail and slug bait prod-ucts
are available. Baits containing the
active ingredient metaldehyde are most
common; however, metaldehyde baits
are particularly poisonous to dogs and
cats, and the pelleted form is especially
attractive to dogs. Don’t use metaldehyde
snail baits where children and pets could
encounter them. Metaldehyde baits con-taining
4% active ingredient are more
effective than those containing only 2%;
however, they also are more toxic to dogs
and wildlife. Avoid getting metaldehyde
bait on plants, especially vegetables.
Some metaldehyde products are formu-lated
with carbaryl, partly to increase
the spectrum of pests controlled such
as soil- and debris-dwelling insects, spi-ders,
and sowbugs. However, carbaryl
is toxic to earthworms and soil-inhab-iting
beneficial insects such as ground
beetles, so it is better to avoid using
snail baits containing carbaryl.
Baits containing only metaldehyde are
most reliable when temperatures are
warm or during periods of lower hu-midity.
When it is sunny or hot, these
baits cause snails and slugs to die from
desiccation or dehydration. The pests
usually die with one day of ingesting
the chemical or getting it on their foot.
If cool, wet weather follows the bait-ing,
they can recover if they ingest a
sublethal dose. Don’t water heavily for
at least 3 or 4 days after bait placement,
since watering will reduce effectiveness.
Most metaldehyde baits break down
rapidly when exposed to sunlight and
high irrigation; however, some paste or
bullet formulations (e.g. Deadline) hold
up somewhat longer in these conditions.
Iron phosphate baits—available under
many trade names including Sluggo
and Escar-Go—have the advantage
of being safe for use around children,
domestic animals, birds, fish, and other
wildlife, making them a good choice
for an integrated pest management
program in your garden. Ingesting
even small amounts of the bait will
cause snails and slugs to stop feeding,
although it can take several days for
Figure 8. The devil’s coach horse, Ocy-pus
olens, which is more than an inch
long, is a predatory beetle that feeds on
snails and slugs.
Figure 9. The decollate snail is a preda-tor
of snails.
4. November 2009 Snails and Slugs
◆ 4 of 4 ◆
the snails to die. You can scatter the
bait on lawns or on the soil around any
vegetable, ornamental, or fruit tree that
needs protection. Iron phosphate baits
can be more effective against snails
than slugs overall and more effective
than metaldehyde during periods of
higher humidity. Snails and slugs tend
to hide before they die, so you won’t
see scattered empty shells or dead
snails and slugs as you would if treat-ing
them with metaldehyde.
Sprinkle baits in areas that snails and
slugs regularly frequent such as around
sprinkler heads. Placing baits repeated-ly
in the same areas maximizes control,
because mollusks tend to return to food
source sites. Never pile bait in mounds
or clumps, especially those products
that are more hazardous, because pil-ing
makes bait attractive to pets and
children and is not as effective as sprin-kling.
Thick, liquid baits might persist
better when it is rainy or in areas that
receive sprinkler irrigation.
The timing of any baiting is critical; bait-ing
is less effective during very hot, very
dry, or cold times of the year, because
snails and slugs are less active during
these periods. Irrigate before applying a
bait to promote snail activity, and apply
the bait in the late afternoon or evening.
Sprinkle bait around sprinklers, close to
walls and fences, or in other moist and
protected locations, or scatter it along
areas that snails and slugs cross to get
from sheltered areas to the garden.
REFERENCES
Dreistadt, S. H., J. K. Clark, and M. L.
Flint. 1994. Pests of Landscape Trees and
Shrubs: An Integrated Pest Management
Guide. Oakland: Univ. Calif. Agric. Nat.
Res. Publ. 3359.
Flint, M. L. 1998. Pests of the Garden and
Small Farm: A Grower’s Guide to Using
Less Pesticide. 2nd ed. Oakland: Univ.
Calif. Agric. Nat. Res. Publ. 3332.
Koehler, C. and W. Barclay. 1983. Snail
Barriers. California Agriculture 37(9-10):15.
McDonnell, R., T. Paine, and M. J. Gor-mally.
2009. Slugs: A Guide to the Invasive
AUTHORS: M. L. Flint, UC Statewide IPM
Program, Davis/Entomology, UC Davis; and
C. A. Wilen, UC Statewide IPM Program,
San Diego Co.
EDITOR: M. L. Fayard
ILLUSTRATIONS: Figs. 1, 3–7 and 9, J,
K. Clark, Fig. 2, D. Rosen; and Fig. 8, R.
Weinstein.
This and other Pest Notes are available at
www.ipm.ucdavis.edu.
For more information, contact the University of
California Cooperative Extension office in your
county. See your telephone directory for addresses
and phone numbers, or visit http://ucanr.org/ce.cfm.
University of California
Agriculture and Natural Resources Program
Produced by UC Statewide
Integrated Pest Management Program
University of California, Davis, CA 95616
University of California scientists and other
qualified professionals have anonymously peer
reviewed this publication for technical accuracy. The
ANR Associate Editor for Urban Pest Management
managed this review process.
To simplify information, trade names of products
have been used. No endorsement of named products
is intended, nor is criticism implied of similar products
that are not mentioned.
This material is partially based upon work
supported by the Extension Service, U.S. Department
of Agriculture, under special project Section 3(d),
Integrated Pest Management.
WARNING ON THE USE OF CHEMICALS
Pesticides are poisonous. Always read and carefully follow all precautions and safety recommendations
given on the container label. Store all chemicals in the original, labeled containers in a locked cabinet or shed,
away from food or feeds, and out of the reach of children, unauthorized persons, pets, and livestock.
Pesticides applied in your home and landscape can move and contaminate creeks, rivers, and oceans.
Confine chemicals to the property being treated. Avoid drift onto neighboring properties, especially gardens
containing fruits or vegetables ready to be picked.
Do not place containers containing pesticide in the trash or pour pesticides down the sink or toilet. Either use
the pesticide according to the label, or take unwanted pesticides to a Household Hazardous Waste Collection
site. Contact your county agricultural commissioner for additional information on safe container disposal and
for the location of the Household Hazardous Waste Collection site nearest you. Dispose of empty containers
by following label directions. Never reuse or burn the containers or dispose of them in such a manner that
they may contaminate water supplies or natural waterways.
NONDISCRIMINATION STATEMENT
The University of California prohibits discrimination or harassment of any person on the basis of race,
color, national origin, religion, sex, gender identity, pregnancy (including childbirth and medical conditions
related to pregnancy or childbirth), physical or mental disability, medical condition (cancer-related or
genetic characteristics), ancestry, marital status, age, sexual orientation, citizenship, or service in the
uniformed services (as defined by the Uniformed Services Employment and Reemployment Rights Act of
1994: service in the uniformed services includes membership, application for membership, performance of
service, application for service, or obligation for service in the uniformed services) in any of its programs
or activities.
University policy also prohibits reprisal or retaliation against any person in any of its programs or activities
for making a complaint of discrimination or sexual harassment or for using or participating in the investigation
or resolution process of any such complaint.
University policy is intended to be consistent with the provisions of applicable State and Federal laws.
Inquiries regarding the University’s nondiscrimination policies may be directed to the Affirmative Action/
Equal Opportunity Director, University of California, Agriculture and Natural Resources, 1111 Franklin Street,
6th Floor, Oakland, CA 94607, (510) 987-0096.
v
and Native Fauna of California. Oakland:
Univ. Calif. Agric. Nat. Res. Publ. 8336.
Sakovich, N. J., J. B. Bailey, and T. W.
Fisher. 1984. Decollate Snails for Con-trol
of Brown Garden Snails in Southern
California Citrus Groves. Oakland: Univ.
Calif. Agric. Nat. Res. Publ. 21384.