From the look of those leaves, it looks like a larger pest perhaps grasshopper, Junebugs or Katydids but if you saw files, see this from SFGate:

Organic Pest Control
When whitefly populations are small, contain them by removing infested leaves or hosing leaves down with water sprays. The use of a hand-held, battery-operated vacuum cleaner on leaves can also be helpful. Vacuum in the early morning or during cool periods when whiteflies are more sluggish, then place the vacuum bag in a sealed plastic bag and freeze it overnight to kill the insects. For a smaller whitefly problem, try a commercially-available yellow whitefly sticky trap; larger infestations may require a commercial oil-based spray. You can also make your own spray, called white oil, by mixing 1 cup of cooking oil, 1 1/2 cups of water and 2 teaspoons of dishwashing detergent and adding it to water in concentrations of 40 parts water to one part oil mixture.
Chemical Pest Control
Controlling whiteflies with insecticides is difficult because they have developed resistance to some chemicals. Also, products containing carbaryl, pyrethroids, diazinon or imidacloprid can kill the whitefly's natural enemies. To combat chemical resistance, alternate the types of chemicals you use. Since eggs and pupae aren't as susceptible to insecticides, use four to five applications on nymph and adult populations only, at five- to seven-day intervals. Over-the-counter insecticides commonly used for whitefly control include neem oil, insecticidal soap, horticultural oil, pyrethrins, permethrin, imidacloprid and malathion. Make sure any insecticide you use is labeled as safe for a home garden.