While recently investigating a system that daily sprays for this pest, my thoughts went to the the correct pluralization of the noun “mosquito”.

Problem:
It is not always clear how to pluralize a noun that ends with the letter “o”.

Explanation:
Years ago, U.S. Vice-President Dan Quayle became the butt of jokes when he told a student that the word “potato” should be spelled P-O-T-A-T-O-E.

The veep’s misspelling was likely due to the fact that the plural of “potato” — which is spelled P-O-T-A-T-O — is spelled P-O-T-A-T-O-E-S.

In other words, this singular noun with an “o” at the end is pluralized by adding E-S, not by adding only S.

Similarly, the singular noun “mosquito” — spelled M-O-S-Q-U-I-T-O — is pluralized in English by adding E-S instead of by adding S.

I believe that some American English speakers pluralize the singular noun “mosquito” by adding only an S because this is how the noun is pluralized in Spanish and because of the increasing influence of Spanish on American English

Solution:
Use “mosquitoes” with an O-E-S ending for English. Use “mosquitos” with an O-S ending for a language such as Spanish.