may attack orchids for several reasons and nowadays there are
lots of natural or chemical ways to control that.
The right control of light, water and correct adubation helps
the plant in preventing diseases. The disposition of the vases
with a distance of at least 20 cm is also recommended so the diseases
The sterilization of the tools and proper manipullation of the
sick plants must be made with care so the plagues may not spread
to healthy plants. Also, the very young and more sensible ones
should be kept away from the adult plants.
In general, too much water may bring chronicle problems to the
roots, causing some rotting on the roots. It also causes the loss
of leaves, turning them into a yellow or light-green color. The
excess of water also atracts fungus that may quickly kill your
like the aphids, are also very common in orchids. A plant under
attack of an aphid, that loves feeding on the new branches (Oncidium
seems to be the best), and flower buds may end up with a nice
flowering in days.
Besides damaging the flowers, the aphids, may transmit certain
viruses notably the OFV (Orchid Fleck Virus). Other plagues as
snails, nematoids and mealybugs eat the roots and leaves.
In the case of snails, it is recommended the manual removing,
with the help of a trap made with some bread absorbed with some
beer o even some small cuts of "squash".
For a complete removing of the eggs (that measure ca.1 to 3 mm)
and the rest of the snails, one must drow the vase for one or
two hours and reapeat the process for 2 or 3 weeks.
When you buy a orchid try always to know its origin, so you won´t
take home a sick plant, already contaminated with viruses, nematoids,
snails and fungus for instance.