Insect growth regulating composition

Abstract

A microencapsulated insect growth regulating composition comprising an insect growth regulation active ingredient in a wall formed of polyurethane or polyurea, having an average particle diameter of 1 to 40 μm, a wall thickness of 0.005 to 0.5 μm, a ratio of a wall thickness/an average particle diameter of 0.0003 to 0.003, and a volume ratio of microencapsulated particles having a particle diameter of not less than 50 μm of not more than 20% by volume based on a total volume of microencapsulated particles sufficiently exerts efficacy of the active ingredient, i.e., the insect growth regulation activity.

1 . A microencapsulated insect growth regulating composition, which comprises an insect growth regulating active ingredient encapsulated in a wall formed of polyurethane or polyurea, having an average particle diameter of 1 to 40 μm, a wall thickness of 0.005 to 0.5 μm, and a ratio of a wall thickness/an average particle diameter of 0.0003 to 0.003, wherein a volume ratio of microencapsulated particles having a particle diameter of not less than 50 μm is not more than 20% by volume based on a total volume of microencapsulated particles.  
     
     
         2 . The insect growth regulating composition according to  claim 1 , wherein the insect growth regulating active ingredient is an insect juvenile hormone-like compound.  
     
     
         3 . The insect growth regulating composition according to  claim 1 , wherein the insect growth regulating active ingredient is 4-phenoxyphenyl 2-(2-pyridyloxy)propyl ether.  
     
     
         4 . Use of an insect growth regulating composition according to  claim 1  for controlling an insect pest.  
     
     
         5 . A method for controlling an insect pest comprising applying an effective amount of an insect growth regulating composition according to any one of  claim 1  to  3  directly to an insect pest or to a place where an insect pest inhabits.