It helps to mark your trees with a number so you can have a reference point. Insect traps are used to catch pests and monitor their relative development and trigger additional sampling. Traps can also be used to time sprays. A black-light insect trap can be used for moths, beetles and stinkbugs. They should be suspended on a pulley and operated some 20 feet in the tree canopy.
Pheromone traps containing a sex attractant are also available for many insects.
They are species specific. There are 2 ways to monitor for pecan weevils using traps. First is by placing cone cage traps under tree drip line and recording the number of adult weevils collected. A second way is to use trunk band traps. Burlap bags can be wrapped around tree trunks of several trees in an orchard.