Current Page -  General Pest and Disease Information     

What's Bugging You

Pest Control Strategies - An insect or disease only becomes a pest when its numbers increase to the point where serious damage is inflicted on plants. Next time a plant in your garden is affected by a pest or disease problem ask yourself why it was so susceptible to attack in the first place.

SnailsSimple Strategies to Avoid Pest and Disease Problems

●Grow pest and disease resistant varieties.
●Mix different vegetables and herbs together rather than growing a monoculture of one crop.
●Avoid the use of all pesticides. They kill indiscriminately both beneficial and harmful organisms. 
●Practice crop rotation.
●Create habitat and refuges for beneficial species.
●Accept minor imperfections. Which is more harmful, the spot on a leaf of silver beet or the chemical sprayed to control it? 
●Learn to identify good insects from bad.
●Keep records of when pest and disease problems occur. You may be able to avoid growing that crop at that time next year, select a different variety or grow it in a different way to avoid problems in the future.

Less Stress - Less Strife - The easiest way to have a pest free garden is to have a healthy soil and strong growing plants. Trying to grow plants outside their climatic range, drought, lack of nutrients, compacted soil and other factors that stress your plants also make them more susceptible to attack by pests and diseases.  

Healthy Soil - Healthy Plants -  Incorporating organic matter into the soil not only improves the soil structure and texture, it helps you and your plants beat pest problems.

Organic matter can improve the water-holding capacity of sandy soils and improve drainage in clay. Nutrient rich organic matter such as composted plant or animal manure will also provide nutrients for plants and soil organisms like worms. Organic matter also contains many beneficial fungi and parasitic nematodes.

Just remember that commercially produced compost materials have all the life pulverized, deodorised and processed out of them. Use them as a last resort. The most biologically active compost is the one you make yourself, regardless of your skill in compost making.

Crop Rotation - Related plants often suffer from the same pest and disease problems. When growing vegetables, try to plant at least four different family groups in a row before returning to the original crop. For example beans (Fabaceae) may be followed by cabbages (Brassicaceae), carrots (Apiaceae) and tomatoes (Solanaceae) before replanting peas or any other member of the Fabaceae group.

Companion Planting - Diversity of planting including growing plants from the daisy (Asteraceae) and carrot (Apiaceae) family attracts beneficial predators and parasitoids to your garden that will help to control damaging pests. Companion planting works on this principle.

Welcome Everyone - Encourage insect eating birds into your garden by protecting them from cats and providing safe nesting sites and water. Cool moist refuges, rocks, logs and leaf litter will provide habitat for lizards, frogs, centipedes and spiders who will all aid in controlling pests, creating a balance within the garden. Beneficial species include lacewings, hover, robber and tachinid flies, ichneumon wasps, ground beetles, predatory mites, ladybeetles and dragonflies.

Be Patient - Gardeners wishing to avoid using highly toxic chemical sprays must be prepared to tolerate a certain degree of damage until predators increase sufficiently in numbers and the influence of other strategies begin to return things to their natural order. In the mean time there are a number of low toxic options available at your local nursery.

(This text is an edited extract from my book, 'Organic Vegetable Gardening', published by ABC Books). See [Books]

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