crazy white thing on my lemon tree and night jasmine

i just noticed these little white thing on my lemon tree and night jasmine but i'm not sure what it is.. any help from you guys would be greatly apreciated.

 

Scale bugs. Poking them with a Q-tip soaked in alcohol will kill them dead and knock them off the plants. If you have lots and lots of them, spraying with alcohol might be the answer. You'll have to do this a couple of times in order to catch the new hatchlings.

 

Will the alcohol keep them from coming back? My main concern is that these plants I bring into the house in the winter time.

 

If you treat 3-4 weeks in a row, you'll get them all.

 

Another question is do I use a full concetrate of alcohol? Do I spray daily? And will the alcohol damage the plant? I hope I'm not bothering you too much, I really appreciate your help.

 

No worries! I use full concentrated ethanol with menthol in it, which doesn't seem to hurt my plants but it sure does kill the bugs. You can also use isopropanol to the same effect. I'd spray every three days unless the infestation is very heavy (ie you see more scale bugs than plant). In heavy infestations, I'd spray daily.