Mimosa Gum - A foundling seed

Hello mates! The second veg week is here. There's not too much to add respect the past week, she slow down a lot after the transplant in fact i find the pot very wet during the week so i didn't give water. Furthermore she shows some signs on the lower and older leaves but i don't recognize what was it. Already during the past week i spraied the plants with oil's neem and potassium soap, i love use only bio-product on my plants, because i had the thrips in the tent but in this case i use it for helping the Mimosa to go beyond her difficulties.