Take a close look at the stems and leaves of your Jatropha. Do you see large white clumps of soft scale? This insect begins along the stems looking like a pale yellow goo. After a day or two the yellow soft scale produces a white cotton covering to protect itself from insecticides and predators.
Insecticidal Soap or Neem Oil can be used in the evening to kill these pests. Cyonara hose-end is also very effective. Many insects thrive in the summer, so be good bug scout. While watering or walking and admiring your landscape, take the time to get a closer look to see if any of these summer insects are attacking your favorite plants.