Composite particles for controlling arthropod infestation

A composite particle comprising:

• i) at least one baculovirus particle;
• and
• ii) an enveloping coating of wax that at least partially coats the baculovirus particle of i) made up of at least one wax that is degradable and/or soluble in the gut of a larva of an arthropod species through at least one of enzyme digestion or being soluble in a larval gut environment of pH 8 to 12, wherein the at least one wax is a natural wax selected from carnauba wax, beeswax, Chinese wax, shellac wax, spermaceti wax, myricyl palmitate, cetyl palmitate, candelilla wax, castor wax, oricury wax, wool wax, sugar cane wax, retamo wax and rice bran wax.