Hanayama-san,

Since you mentioned a web, it seems you aren't talking about spider mites. Not sure if actual spiders are cause to worry. I'm fairly sure they don't screw with mary, and I've heard they're good for gardens as the prey on other creepy crawlies. Due to their sensitive physiology they are a metric on the presence of pesticides and other chemicals.

And for the record, I'm pretty sure pyrethrin works on all insects, beneficial varieties like ladybugs and spiders included.


Ganbatte-kudasai! :thumbsup: