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Pests And Diseases |
There are other moths, and also a leaf mining insect, which,
however, are not likely to be much in evidence, if at all.
As we have noted in the Chapter on oxygenating plants,
if the inhabitants of the pool or aquarium are carefully chosen,
there should be little trouble from algae or green scum. There
is always the possibility that certain plants, including species of
elodea, may take up more than their allotted room. Greatly
overcrowded water does provide hiding places for pests and can
lead to disease organisms gaining a hold, and this applies to
underwater vegetation. Sometimes, the only way of dealing
with overcrowding is to empty and replant the pool although
much can be done by regular thinning and cutting out.
Care is needed before using copper sulphate crystals or even
permanganate of potash which we often recommended for
clearing out water weeds. Fish are likely to suffer from such
methods of control.
Snails can be troublesome in attacking and sometimes eating,
the leaves of water plants and they can often be trapped by
leaving some greenstuff on the surface of the water overnight.
The snails will be attracted to the leaves and can then be
destroyed. It is not unknown for water rats to attack the thick
roots of Nymphaeas. Little can be done apart from trapping
them.
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