Eradicate caterpillars on orange leaves
When the orange leaves grow thicker and green, there are lots of caterpillars that are attached to the orange leaves.
Trimming orange leaves and stems sometimes has an effect
But the caterpillar that came after it was not the caterpillar that came the first time. The caterpillar is then another caterpillar, then another caterpillar. Then the first action is said to be effective.