I recomend a 50-50 mix of rubbing alcohol and water in a spray bottle. Drench the bugs and the plants that are infected. If you have root mealies, spray them when they are exposed. You can also squish mealies with a small tool. I believe that mealies come from underwatering, so water well.

I never used neem oil, but mixing it with soap may be too much...did someone recomended it?

I use only rubbing alcohol if needed, as Rob suggested. Diluted should be ok, but I use it full stregth. Repeat treatment after few days, perhaps few times - bu do not overdo it. Always check plants thoroughly before spraying and keep them out of sunlight while spraying with anything. Rubbing alcohol will dry fast.

I second the use of a systemic on root mealies. You dont need to dig the plant up, and it works on plant mealies, too.. But seriously learn to water on schedule and to keep all you plants healthy, mealies attack dry weak plants, in 30 years I have not seen many and those cleaned up easy.

i read up about the neem oil online and saw that solution on some youtube videos. but was wondering if these mentioned above can work for haworthias too?

I've used the systemic granules to get rid of root mealies on Haworthias. Worked fine.

i do not have access to the systemic granules in singapore. mostly shipped from overseas that will take awhile to reach me..

Repeated alcohol spray and removing crawlers for several weeks in a row should be sufficient. If use insecticidal soap (which is less damaging for plants than normal soaps), watch out to not use too high a concentration or your Haworthia can be damaged.

Ugh mealies! I found a couple hanging out on one of my succulents and, luckily, I caught it early on. I poked them with alcohol on a cotton swab, which seemed to work, but I got grossed out and ended up beheading my plant. Hopefully they’re gone for good! :)

Question... Do these root mealies show up more prolifically in damp soil. Is an infestation hard to notice or fairly simple. Is it likely large once you do notice them. I have never had them. I feel like a hypochondriac who gets a new disease when ever they are on the web. Thanks for any input.

From what I've read., they prefer it dry. They can be hard to notice unless the infestation is really bad. They look like tiny white ovals and, at a glance, are easily mistaken for perlite/pumice. They set up house in a lot of my plants last winter when most were dormant, so I didn't notice anything wrong until spring, when the plants weren't growing and looking as good as they should have been. I had never (in decades of growing plants) had root mealies before, and don't know what they came in on.

There are a couple of threads with good information about them (and other pests) over on cactiguide. I don't know if it's alright to post the link here.