Pest Control Adviser (PCA). Written recommendations are required for many pesticides and are made by
licensed pest control advisers. In addition the PCA can monitor the field for agronomic problems including
pests and nutrition. Growers may hire private PCAs or receive the service as part of a service agreement with
2010 Lemons Costs and Returns Study San Joaquin Valley South UC Cooperative Extension 7
an agricultural chemical and fertilizer company. In this study, a private PCA monitors the crops for pest,
disease, and nutrition.