I just bought my first two trees and already have problems with pests and yellow leaves. Help?
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Treating the plants with neem oil should help with controlling the pest problem. It will also help in treating any fungal-related issues that may occur. Here is additional info on neem oil: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
As for the yellowing, this is probably stress related and most likely due to the pests. This article may also help: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/answers-to-what-causes-hibiscus-leaves-turning-yellow.htm