my indoor Hisbiscus - slender,about 6' tall has dropped 50% of leaves and has very small pests with tiny spider like filaments in proximity. Are these spider mites? - very small to see ( smaller than aphids) and they seem to move like spiders? Plant is desperate looking.........suggestion for killing pests? I had it in sunny warm window location with open window and breeze blowing through. Location in Parksville, B.C., Canada. Zone 6-7?