Ants and insects

[Leisurely]

I am beginning to see large numbers of very tiny ants in my greenhouse. When I get ants I also get some scale insects. I usually spray the entire house with Orthene wettable powder and kill the ants thus eliminating the insect problem. My concern is this: At this time of year the greenhouse is bursting with flowers making it impossible to do a thorough spraying without getting the flowers wet.
The ratio calls for 3/4 tsp. per gal. of water. Does anyone know if that strength of solution will cause flower damage.
I would certainly hate to damage or kill any of the flowers . Your advice would be appreciated.