It is summertime and you will probably have some insects or diseases crop up on your vegetables, perennials, maybe some trees or shrubs.
Identifying the insect or disease properly is your first step, secondly, figure out if this is something your plant can live with and survive or needs to be remedied, finally, plan of action.
You may have heard about Late Blight in Tomatoes this is from my friend, Trey Pitsenberger’s blog who has been talking about it the last week or so. Anyway, certain problems like Late Blight can affect not only the tomatoes that actually have it but other crops too like potatoes, etc. It is highly contagious and can jump from tomatoes to potatoes. Anyway, in this case, you need to get rid of the infected crops dispose of them properly, NOT IN YOUR COMPOST PILE. Burning would be an interesting option but not recommended.
Anyway, important to identify correctly and make a plan of action. For instance, in the article by the New York Times, they identified an herbicide as a fungicide. So, for anyone who read that, bought the chemical and sprayed it thinking it was going to cure the fungus, not happening. Indeed it would have killed the plants. Be aware of the information you are using.