Pecan IPM Toolbox
Insect Monitoring and Control
Walnut Caterpillar Control
Survey
| Sampling | Time |
| (a) Survey tree canopy for eggs and/or feeding colonies on 5 - 10 percent of trees in orchard. | (a) Pollination through October on a 3-week interval |
| (b) Record number of colonies per acre.* | (b) On a 3-week interval |
Action Level
Spray if:
Ten colonies per acre are found. Spray after eggs hatch, but before the 4th instar.
*An egg mass may be considered a colony once the larvae have successfully hatched and started feeding.
Example: 17 trees per acre, 50 acres in an orchard, check at least 2.5 acres of trees (42 trees) at random, spray if 25+ colonies are found.
Next: Stinkbug and Plantbug Control