What is one consequence of using a wrong spray schedule for pests like Grape Leafhopper?

Using an incorrect spray schedule for pests such as the Grape Leafhopper can lead to a potential resurgence of the pest population. This occurs because improper timing or dosage of pesticide application can inadvertently allow some pests to survive when they would otherwise have been eliminated. For example, if the spraying occurs too early or too late, it might not effectively target the life cycle stages of the pest that are most vulnerable to the treatment.

Additionally, pests may develop resistance to pesticides when they are not managed properly, leading to an even greater problem in the long term. This pest resurgence can ultimately harm the crops, leading to reduced yields and increased management costs. Thus, an effective spray schedule is crucial to maintaining control of pest populations and preventing their rebound.