SLUGS
AND SNAILS - are not insects but molluscs and thus
belong to the same group as shellfish such as oysters
and clams. Slugs usually range from a quarter inch
to four inches in size, and because they don't have
the advantage of a snail's protective shell, they have
a greater requirement for damp places in which to rest
during the day. They feed during the night, creating
holes in foliage and chewing on leaf edges, causing
them to become ragged. Feeding between the veins can
cause shredding of the leaves. One can usually verify
their presense from the shiny trail of slime they leave
behind them on their travels. Damage can be significant,
and tends to be worse in spring and fall when conditions
are damper and especially where there is heavy use
of organic soil amendments such as compost and manure.
There are several different species. Slugs are usually
gray with some darker markings, although some are more
yellowish and some are almost black in color. Frequent
cultivation may expose eggs and even slugs themselves
to the elements and predators. Remove as many hiding
places such as boards, large stones etc. as you can,
although leaving a board or two and checking underneath
it each day may allow you to capture and dispose of
any slugs which find it a convenient resting place.
Reduce mulches to minimize damp locations. Snails can
be handpicked, but this may be rather more difficult
(and unpleasant!) with slugs. Diatomaceous earth can
be effective, and they are said to be repelled by an
oak leaf mulch and certain plants such as artemisia. |
