Insect control nanobodies are provided. Accordingly there is provided a nanobody which specifically binds to an insect polypeptide selected from the group consisting of: a polypeptide comprising a chitin binding domain (CBD), V-ATPase subunit c, trehalase, cytochrome p450 monooxygenase, chitin deacetylase, chitin synthase and NPC1 sterol transporter, wherein binding of the nanobody to the insect polypeptide confers an insect control activity to the nanobody. Also provided are polynucleotides encoding the nanobody, host cells expressing the nanobody and methods of using it.