Pest management, in an organic garden, relies on a combination of common-sense practices. It involves a range of complementary techniques aimed at controlling the numbers of harmful insects in the garden.These involve:
These complementary techniques are key components of an Integrated Pest Management approach. Healthy soil and healthy plants
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Readings |
Creating healthy soil (article written by Jerry Coleby-Williams), Gardening Australia Soil Composition, Gardening Australia Fact Sheet Easy Guide to Organic Gardening, Safer Solutions Healthy Soil - Boring but Important, Sustainable Gardening Australia (SGA) Soil life, Wikipedia Create Healthy Soil For Your Garden Improving Sandy Soils, Gardening Australia Fact Sheet |
Videos | Organic materials in soil, eHow (UK) How plants grow in soil, eHow (UK) |
Companion planting
Some plants assist in the growth of others, by attracting beneficial insects, regulating pests, repelling harmful insects, providing nutrients, or simply providing a shaded microclimate or climbing support.
Jackie French in her book, Guide to Companion Planting in Australia and New Zealand, warns that "many companion planting hints have been passed on from book to book, all based on European observations - whereas Australia has quite different pests and predators, and garden relationships - and the 'companion planting' that works overseas may not work here at all."
Readings |
Companion
Planting Guide, table of companions and foes for a list of vegetables and plants (AUS) Companions/Guilds, Gardening Australia Fact Sheet Companion planting, Sustainable Gardening Australia (SGA), with a comprehensive companion planting chart Companion planting & organic bug sprays (PDF) by Teresa Rutherford (Penrith NSW) |
Videos |
Companion plants, Organic Research farmer Marianne Stahl explains the concept of companion planting (US) An Introduction to Companion Planting, Horticulturalist Abram Bicksler explains companion planting (US) |
Beneficial insects
Aphids, cutworms, mealybugs and other pests can multiply and destroy your vegetables. Organic gardeners enlist the aid of beneficial insects to battle and help control pest outbreaks.To nurture these beneficial insects in your garden,
- do not use pesticides which kill beneficial insects as well as pests,
- use organic sprays, if you must, but remember that they are not harmless, e.g. sulphur fungicide harms parasitic wasps and predatory mites, insecticide soap harms hover fly larvae,
- grow flowers to feed beneficial insects. Among the favourites are flowers such as daisies, marigolds, sunflowers, thistle, yarrow, parsnip, parsley, dandelions and fennel (a study has shown that the fennel flowers attract almost 500 different insects).
- provide 'nursery' plants for pests in your garden to feed beneficial insects; a “nursery” plant is one which supports pests with no ill effect, e.g. the common nettle supports the nettle aphid which does not attack other garden plants. Nettles therefore attract many beneficial insects, particularly ladybirds, to your garden.
- provide safe cover; ground dwelling insects do not like bare soil, therefore don't be too tidy !
Readings |
Attracting Beneficial Insects to your Garden, Sustainable Gardening Australia (SGA) Good bugs page Attracting Beneficial Insects to your Garden , The Urban Gardener (AUS) |
Videos |
Which plants bring beneficial insects to my garden? Tracy DiSabato (AUS) What do ladybugs eat? eHow (US) |
Garden hygiene
Preventing pests and diseases through good garden hygiene is the best strategy.Remove weeds, use mulch to suppress weed growth, inspect plants regularly for any leaf chewing insects or disease symptoms and dispose of any spent crops that may be diseased. Disinfest equipment if you have been working on diseased plants.
Pick up fallen fruit to avoid the spread of disease.
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Crop rotation
Crop rotation is "the successive planting of different crops on the same land to maximise soil fertility and help control pests and diseases". Some plants are referred to as “heavy” feeders, while others are “light” feeders. For example, the Brassiaceae family are mainly heavy feeders and will take a lot of nutrients from your soil, the Alliaceae family are light feeders and will not do well in a rich soil. Therefore it makes sense to plants onions after cabbages!
Heavy Feeders include potatoes, tomatoes, cauliflower, broccoli,
cabbage, sweet corn, lettuce, cucumbers, zucchini, spinach, lettuce and
Asian greens.
Light Feeders include onions, leeks, garlic, beetroot, carrots, parsnips and silverbeet Legumes include peas, snow peas, broad beans, runner beans, snake beans and okra. Green Manure Crops are crops grown, not to be harvested, but to be worked back into the soil. These are generally comprised of thickly sown annual grasses and/or legumes, |
Sustainable Gardening Australia's four-bed crop rotation:
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Readings |
Crop rotation, Gardening Australia Fact Sheet The Vegie Guide - Basic, Practical Crop Rotation, Gardening Australia Crop rotation, Organic Guide |
Videos |
Garden planning & crop rotation (US) |
Natural sprays
Organic gardeners use natural, biological ways of protecting
and growing their crops. Sprays used by organic gardeners are natural sprays,
without harsh chemicals. Readings |
Pests and solutions, Gardening Australia Fact Sheet Chilli and Garlic Natural Spray Solutions, The Garden Gurus |
Integrated pest management (IPM)
IPM programs use current, comprehensive information
on the life cycles of pests and their interaction with the environment. The main part of IPM is observation. It involves the techniques described above, e.g.- Manual removal of insects like snails, slugs and scale.
- Setting traps like beer, pheromone, hessian and soap.
- Watering and feeding your plants correctly so that they are healthy and vigorous.
- Developing a healthy friable soil with good drainage.
- Employing good garden hygiene, which means cleaning up around your garden pulling badly infested plants, old fruit and leaves.
- Encouraging predatory insects like lady bugs, lacewings, lizards and frogs.