cleaning scale form cactus plants with an old toothbrush

background biological bug cacti cactus disease citrus cladode coccinellidae colony control cryptolaemus damage diaspis diseased dots garden growth houseplant indian infest infestation insect insects lady ladybird larva larvae macro mealybug natural nature oleoptera opuntia parasite parasites parasitic pear pest plant prevention prickly scale problem scales treatment unhealthy vermin