[alienfx]

Marigold:Hope ur nep is in a better condition now.It is good practise to spray some protection every 1-2 weeks even tough the plant is healthy and without any pest.

You dont need to use poison chemical pesticides.You can use water mix with oil(you can use cooking oil leftovers which we normally throw away;no need to use new oil),water mix with soap,water mix with neem oil etc. Spray below the leaves because these is the vunerable area.Once the leave below is damaged,it is exposed to all sort of dieases which is not acctually from the pests it self.