My dead Squash Plant

Have you ever heard that sick plants get infected by insects?  If your plants were healthy they would mysteriously ward off harmful insects. The idea that strong plants somehow protect themselves from evil insects is bull.  My case point is my squash plant.  Every year I grow a zucchini squash plant that starts out beautifully but by the time it starts to produce it is infected with squash beetles.  It doesn't matter how much you kill the beetles, each day they increase in number.  I get the same-old results, one zucchini, from half dead plant.  Oh, how I would love to use insecticides.  I grow organically, so I must confess, I can't grow zucchini due to the squash beetle.  I'm beaten by a bug.