My garden has pests! But I don't know what kind.?

Systemic insecticides,sprays,go through leaves and stems and must be applied initially,then every two weeks for 6 weeks.but not for fruit you plan on eating.for that I would apply insecticidal soap,or sprinkle wood ash which is caustic and to be applied in the morning and rinsed at 4 pm for 1 week.then fruits will still be viable for human consumption.