Organic gardeners do not like to use chemicals in their gardens, preferring instead to use methods such as companion planting to deter pests. There are occasions though when they have to resort to chemicals
There are several fungicides and pesticides available that are classed as 'organic' as they don't remain active for very long, a day or so at the most.
Below is a list of the various chemicals and their uses.
|This is a mixture of copper Sulphate and slaked lime. It is used to control Blight and Mildew.|
|Mixture of coppers Sulphate and washing soda. Used to control Mildews.|
|Used as a pesticide for controlling caterpillars etc. It is not selective so should only be used as a last resort. It is also harmful to fish.|
|Insecticidal Soap||Potassium - salt. Used as a pesticide in the control of Aphids, Whitefly, Red Spider Mites, Scale insects and Mealy Bugs. Only works on direct contact with the insect and persists for one day. Slightly more effective than Soft Soap.|
|Soft Soap||Traditional control for Aphids and Red Spider Mites. Only works on direct contact with the insect and persists for one day. Can be used as a 'wetting agent' in conjunction with other sprays.|
|Nicotine||Because it is non-persistent, it is allowed as a pesticide by organic bodies. It is however, highly poisonous and can be fatal if taken in it's concentrated form. Best avoided.|
|Quassia||Though harmless to Ladybirds and Bees, it is very effective against Aphids, some caterpillars, leaf miners and sawfly.|
|Derived from the Pyrethrum plant, is used as a pesticide which is effective against most insects, especially Aphids. However, it is not selective and can harm beneficial insects as well. Harmless to animals.|
|Dispersible Sulphur||Organic bodies are in dispute if whether this is organic or not. Used as a fungicide against fungi and rust.|
Using Pesticides and Fungicides
It is well to remember that even when using these 'Safe' chemicals, it is wise to treat them as you would if they were dangerous.
© copyright 1999, P. A. Owen