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There can be
little doubt that one of the most disheartening facts of gardening life is
the endless battle with pests. They seem determined to undermine any
attempts the gardener makes at improving his or her plot.
June is the month when
sales of pesticides – which includes weedkillers, insecticides and
fungicides – reach their peak. The reasons are easy to see conditions this
month are ideal for the growth and increase of weeds, pests and diseases.
Having decided to use
pesticides, the beginner venturing into our garden centre might be a little
bewildered by the choice on offer.
The choice of weedkillers
is very much dependant on whether the gardener wants a fast acting contact
weedkiller or a slower acting systemic action weedkiller which will kill
very deep rooted weeds. For a fast acting weed killer where the ground can
be replanted in a few days use Tumbleweed. If problems with ground elder,
couch grass or other difficult weeds persist use Tumbleweed Original Extra
Strong. Both of these products are available in ready-to-use sprayers, or
for larger areas in concentrate form and both are broken down on contact
with the soil.
The same principles apply
when using insecticides, for a quick acting spray use a contact such as
Ultimate Bug Killer, in order to control insects on plants with a contact
spray it is necessary to spray frequently. The systemic insecticides
however do not need to be used so often as their mode of action ensures that
the chemical is more persistent.
Chemicals in conjunction
with cultural controls will ensure that pests are reduced and plants are not
devastated by the ravages of plagues of insects.
Firstly, choose plant
material wisely. It is always worth paying a little more for a plant from a
reputable source as it is less likely to be harboring harmful pests,
diseases and viruses. Ask at the garden centre if the plants have been
grown in compost treated with Intercept or Provado which controls major soil
and foliar pests including the very damaging vine weevil.
Choose resistant
varieties where possible, for example some roses are resistant to mildew and
many vegetables are resistant to diseases such as varieties of parsnip are
resistant to canker, carrots to root fly etc.
Planting on the correct
site is helpful. Inexperienced gardeners often make the mistake of choosing
the wrong place for planting according to the needs of the plant.
Pruning properly is very
important by not leaving snags, which may rot back allowing diseases such as
canker and botrytis to develop.
Next, good cultural
hygiene should be considered. For example controlling weeds which often
provide the primary source of infection for rusts, greenfly, mildew and red
spider mite. These should be killed and removed regularly and rotting
leaves and other debris removed and properly composted.
Feeding and watering
adequately is essential, this reduces plant stress and will lessen the
possibility of attack from
Pests
and diseases.
Despite these precautions
the gardener is likely to find that before long left to their own devices,
pests, weeds and diseases will build up and chemical measures may be
required.
For those gardeners who
prefer a natural pest control the use of Levington Nature’s Answer Natural
Pest Control which contains natural pyrethrins (extracted from the flowers
of a member of the chrysanthemum family) can be used to control red spider
mite, greenfly, blackfly, caterpillar and thrips.
Some products can be
mixed or come as blended products for dual control, such as Levington
Nature’s Answer for combined control of many insect pests and for the
reduction of powdery mildew. Use Rose clear on non-edible plants, to help
control many insect pests, black spot, powdery mildew and rust. If anyone
doubts the necessity of controlling pests, here are a few facts, which
clearly illustrate the need.
It has been estimated
that a single Fat Hen Chenopodium album (a common weed of gardens and
allotments) can produce 70,000 seeds in a season and each seed can survive
in the soil for 30 years.
If weather conditions
were conducive and predators were absent, in theory one greenfly could give
rise to 60 billion greenfly in a single year and each of those greenfly is
capable of transmitting 24 different viruses to it's host plant while
feeding.
Fungal diseases produce
millions of spores from each site of infection, which can travel a good
distance away from the source. Spores of certain species can survive for
more than 20 years in the soil. |