SS for your little boy, how annoying!! Do check his game and make sure he is on
Easy play. Then encourage him to grow the lower tiered plants for as much money as they will sell for until he can afford the upgraded soils and water.
Trying to grow the higher tiered plants in low grade soils/water will definately result in green house catastrophes !!
Also, do throw away the infested pots as I firmly believe pests incubate in the afflicted soil that the spray will not kill.
Also, it helps to trim away dead foliage as soon as possible so the plant can recover and flourish.

best of luck