Looks like a real serious case of mealybugs. Neem oil often helps but may need two or three sprays. I also add veggie oil to help it along. Add several 3 or 4 tbsp. per gallon of water helps to smother the guys.
Never spray it when it is sunny and hot best very early in the morning or just as the sun sets.
They can be a pain Good Luck and Happy Growing David

how often should i spray with the neem,the bottle says every 7 to 14 days?

I would do the 7 day for three cycles to nail the adults and the nymphs.