When growers start using reduced-risk pesticides, secondary pests can become primary pests. That's what's happening with katydids in citrus.
Katydids look similar to grasshoppers, but their bodies are shorter and antennae longer.
In their adult stage, they sprout wings. In the springtime, newly hatched katydids take a single bite from each tiny citrus fruit they encounter. The damaged fruit may fall off, or the bites create unsightly brown scars, rendering the fruit marketable only for juice. Monitoring for katydids is difficult. Since they cleverly hide in tree leafage, it is difficult for farmers to estimate the pest population until they begin damaging fruit.