I have a young Meyers Lemon tree in a pot. It was doing well since I planted it last summer. It’s in a pot with good drainage located in Tampa. Recently I noticed some black stuff on the leaves and saw a couple of tiny mite-sized bugs. I used Garden Safe 3 in 1 with Neem oil. Over the past week since I sprayed it, the leaves are yellowing and falling off at an alarming rate. Did i make the problem worse with the 3 in 1?