I have a very old (20 years) croton plant that has deep sentimental meaning to me. This summer I put it outside and it was very happy and turned beautiful colors. However, since I brought it inside, it has been dropping leaves. At first, I thought it was just adjusting to the climate change, but today I noticed fine web-like stuff in the crotches of the branches. as leaves continue to drop. I sprayed it with Neem oil and washed off the webs with Murphy's oil soap. I also moved it into my greenhouse so it can get more light and humidity. What else should I do to save it? Is there danger of whatever is on it infecting my other plants in my greenhouse?
There is definitely a chance that the insects will move from one plant to another, particularly in a closed environment of a greenhouse. It sounds like spider mites to me. The Neem oil and the Murphy's Oil soap should definitely help, but keep it isolated from your other plants and monitor it. Keep the soil on the dry side, but try spraying the foliage with water periodically, as spider mites thrive when dry. Don't expect miraculous new growth until the day length increases, but I would suspect it will rebound. The more light they get, the more colorful their foliage. Good luck!
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