Sep 29, 2015 - 02:13 PM
If you spray the spider directly, yes it will die. However, once it has dried, if the spider walks across it, it will have no effect, as most insecticides will not kill spiders this way. The microencapsulated insecticides such as Demand CS and Suspend SC will have a better chance of killing spiders once they have dried. The microencapsulated particles will stick to their legs, and then eventually kill them.