Soapy Water for pest control

Abilene, TX(Zone 7b)

I've been using soapy water to control what I think are spider mites. It seems to do a pretty good job especailly if I get them doused really well. It really helped my mealy blue sage . But I do know that some plants don't like soapy water on their leaves, like geraniums. Are there other plants that this shouldn't be used on? Thanks!

Prairieville, LA(Zone 9a)

I know Hawthorns and plums can be damaged by soap... I also don't think you should use it on hairy or downy leaved plants.here is some general info for you.

http://www.ext.colostate.edu/pubs/insect/05547.html

http://stlucie.ifas.ufl.edu/pdfs/master_gardener/Home%20Remedies%20for%20Insect%20and%20Disease%20Control%20on%20Plants.pdf

http://aggie-horticulture.tamu.edu/publications/veghandbook/chapter6.html

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