Don't spray automatically. Give the beneficial bugs a chance to take care of it for you. In the spring, when the aphids usually appear on my rosebuds I just wait. The ladybugs never let me down. The appear out of "no where" and have a buffet.
If it turns out that these mystery bugs are not beneficial then you need to take a look at why the plants are being attacked. Howard always says that healthy, happy plants don't have this problem. Pest attacks, of that magnitude, don't happen unless your plants are in stress. So take a look at the irrigation (too much, too little water), has there been a grade change etc..
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