Photos of the affected plants would be useful. Before thinking about treating, it's important to identify the ailment first. And some of the arguments against preventive treatment:
1. What are you treating (or trying to prevent)? if you don't know, the "treatment" is likely to be ineffective at best, possibly harmful.
2. If you are trying to prevent damage from an insect or arachnid, you are likely to encourage the development of resistance.
Concentrate first on good culture. If you give your plants the conditions that they need, you will greatly reduce the chances that they become diseased. If you avoid the problem in the first place, you won't have to deal with how to solve it later.
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