THE JOYS OF SOAPY WATER!
(One of a series of articles about growing fruit trees
in Samoa, written by Digby Gotts and published in the 'Samoa Observer'
between December 2000 and April 2001)
Soapy water is not only a necessary part of family health, it can also
be used as one of the main ways to control insect pests on your fruit
trees. You will often see small black insects in the tips of growing shoots.
These are commonly aphids, thrips and scale, feeding by sucking the juices
from the plant. They are spread by ants, which collect the sweet honeydew
produced by the aphids. By themselves they do very little damage, but
they also encourage fungal disease and carry bacterial and viral diseases
which can wipe out an entire crop. This whole problem can be simply fixed
by throwing out your soapy water into the tree. The soap destroys the
ability of the insects to breathe and then fertilizes the tree as it breaks
down in the soil. The soap used could be any of the kitchen and laundry
detergents or bathroom soaps used normally in the house. The soapy water
can be simply splashed or thrown over the tree or sprayed for a more precise
use of the mixture.
Leaf eating insects can make the leaves of your favourite plants look
like lace work. Many of these are caterpillars, feeding furiously to grow
up into moths. Large ones are easy to catch by hand. Literally pick them
off and drop them into a bucket of soapy water to drown. The soap makes
the water wetter, blocking their air holes more quickly.
Fruit flies damage many of the fruits grown in Samoa by laying their
eggs just under the skin. The result is small rotten spots and nests of
grubs making the fruit inedible. The main organic solution is to offer
something more attractive to the flies, which can then trap them into
water to drown. Female flies love water-soluble proteins, like Vegemite.
So smear some inside a plastic drink bottle, add some soapy water, poke
a few small holes into it and hang it inside your fruit tree. The holes
should be small enough for the flies to enter but too small to allow bees
inside, so no more than 3/16 inch. Four traps inside every tree will ensure
that most of your fruit is left unstung. Paper bags over the ripening
fruit and keeping the ground clean of rotting fruit will also help keep
the flies from finding your tree.