Disease management/erradication

[Roberta]

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.

[Nicolasdperez]

Originally Posted by Roberta

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.

Here are some photos of the affected plants. They are all apart of the oncidium alliance (Bratonia, aliceara, and odontoglossom) and have been quarantined from the rest of my collection. The damage visible right now is not as bad as before because I have cut off most disease plant matter but it continues to form. All of the plants diseased had black spots when purchased but the disease has increased in severity.