Mandatory Autumn greenhouse-disinfection is the best means.

Without a doubt, this should be done in autumn. It is particularly important to disinfect the greenhouse, if the plants planted in it or get sick by the fungus Phytophthora. To be sure that next year's harvest will be healthy, you need to worry right now.
What are the options?
Firstly, the smoke pots.
Sold these bombs in the store and are quite cheap.
Of the benefits of smoke bombs can distinguish what they can to destroy as insects and pathogens themselves.
However, after the treated greenhouse checkers, it is absolutely necessary to ventilate until the smell is not completely passed.
Second, wet disinfection.
Not such a radical, but no less effective option.
Which implies a wet disinfection? Soil treatment with chlorine or copper sulfate.
1. bleach processing.
In a large bucket of water pour four grams of bleach and wait until it dissolves, insist for about four hours, and spray the soil.
2. Processing of copper sulfate.
Ten liters of water dissolve one hundred grams of vitriol and immediately sprinkle the soil.

Before these activities should be washed with soap solution inside the entire greenhouse. And only then wipe or spray the copper sulfate.
Do I need to change the ground?
It would be nice if you replace the soil. And some will clean the old and the new pour at least twenty centimeters.

Why it is important to replace the soil?

Because it has accumulated in the upper layer of the fungal spores of Phytophthora diseases like for example and others.

Already used soil can sprinkle the garden beds in the area, but do not forget that where it was planted, in order to prevent outbreaks of infections.
Although it is better not to risk it. And the old soil falls apart under the bushes or trees. Once the soil is chilled, all infections and insects disappear.
What primer selected for greenhouses?
Fertile, by the way, you can not buy.
Simply mix the soil in which grow the onions or garlic, and a bit of sand / peat / humus / compost.
Every year there is necessary to change the ground?
Not at all. Replace the soil every three years would be sufficient. But with disinfection it will not work. It must necessarily be conducted every year, and even more often.

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