How to control cucumber beetle ?

https://www.almanac.com/pest/cucumber-beetles

Because overwintering cucumber beetles are around by the time cucurbits are up or transplanted, it is important to check at least daily to control the pest. Handpicking is most effective if done early in the morning when most feeding occurs. These beetles are easy to kill, but because more keep arriving on the plants, it sometimes seems as though controls are not effective. Barriers of row covers (which may have to be suspended over crops with wire hoops to prevent foliar abrasion in windy locations) such as spunbonded remay, cheesecloth, etc., can protect your plants; remove by midsummer to permit pollination.

Removal of goldenrod, aster, etc., from the vicinity of cucurbits helps reduce the number of beetles. Removing plant debris or keeping it to a minimum is also advisable.

Insecticides labelled for vegetables containing pyrethrum, pyrythrin, or carbaryl (Sevin) should control the beetles.

See if you don't find this informative:

https://extension.umaine.edu/ipm/ipddl/publications/5038e/

Powder them regulary. J.

sprinkle some baby powder on your plants.

Spray with soapy water or baby powder! Good luck!