If the site offers online sales of pest control products, submit to Shopping : Home and Garden : Pest Control.

If the site is about a company that produces a biological product used in pest control, submit to Business : Agriculture and Forestry : Biologicals.

If the site is about insect control that extends not just to the garden but also the home, a more appropriate category is probably Home : Homeowners : Pest_Control.

Sites for companies providing residential pest control services in their local area should be submitted to the most appropriate category in Regional.