I had three beautiful plants but I started get these bugs on them that ran fast side ways and would hide soon as you got close if you gave the tree a shake lots would fly out so I was told to use canola oil with soap and test it on a leaf and if it was ok after 24 hour spray the plant and repeat every few days the bugs didn’t seem to disappear so I upped the dose and sprayed them then we got high high and humidity for a week now all the leave are turning black at least 80 percent at the moment the one plant is ok can I salvage them at all???? I uploaded pics of before and after.
Wow, I've not seen that before. At first I though it may have been your oil and soap got washed into the soil and screwed up the roots, but the damage doesn't seem to present like that. From your description, the only thing I can think of is something in the soap or oil. We all know that unless you are making it yourself, you really don't know what they are putting in these products. Since the damage doesn't seem to progress with the growth, it may be enough to simply wash the plant and let it recover. A good soil flush won't hurt either (it is likely that some of your oil did get into the soil) I'm sorry I can't do more for you. It has been a bit of time since you posted, so I am curious if it progressed or if the new growth is healthy. If the new growth is healthy, then you can only clean off the necrotic leaves and try to not do that again.