I will even send a curse upon you— I will send a famine upon you. The last clause should be rendered, Yea, I will therefore curse them [that is to say, the blessings], because you do not repent. I will curse your blessings, means "those gifts which are brought to you from the productions of the earth;" for these productions are frequently called blessings in Scripture.
Related Commentaries of Malachi 2:2
Malachi 2:2
2 If ye will not hear, and if ye will not lay it to heart, to give glory unto my name, saith the LORD of hosts, I will even send a curse upon you, and I will curse your blessings: yea, I have cursed them already, because ye do not lay it to heart.