How to keep pests 50 meter away from field?

Maintaining good housekeeping and sanitation, install the mechanical traps and chemical barrier, frequency of treatment such as misting and power pump ulv sprayer, fogging machine etc. ( for external area)

First move is to investigate the field where is the source of pests..2nd is to plan what are the steps for preventing the pests multiply. then 3rd is the application of all the plans..

Installing a Mechanical and chemical barrier in the perimeter area is recomended but will depend in a situation. Sanitation is the first line of defense.

use of insect repellents of plant origin like neem based formulations

Waste management and proper sanitation