The licence, in one paragraph
In California, recommending an agricultural use of a pesticide is licensed work. A Pest Control Adviser (PCA) is licensed by the state, has passed exams to get there and keeps up continuing education to stay licensed, and puts recommendations in writing. A Certified Crop Adviser (CCA) is a separate, voluntary certification covering nutrient management, soil and water, pest management and crop management. Plenty of good agronomists hold both. Between them, they cover the two big questions in any season: what’s attacking the crop, and what’s feeding it.
Dormant: the plan
Winter is when the season gets decided. A good PCA goes back over last year’s records, scouting notes and lab results, looks at what overwintered, and sits down with you to lay out the year: what’s likely to need doing, roughly when, and what it will cost. You should leave that conversation with a plan and a budget, in writing.
Bloom: protecting a crop you can’t see yet
Bloom calls are about weather and timing. Your PCA watches bloom progress and the forecast and decides whether, when and how to protect the crop. Getting the timing wrong usually costs more than the material.
Spring and summer: walk, count, decide
This is the weekly rhythm. Walking blocks, checking traps and leaves, counting pests and beneficials against thresholds, and deciding whether something needs treating now, needs watching, or needs nothing. A good adviser tells you “nothing” more often than you might expect. Mid-season leaf samples go in so nutrition can be corrected while it still matters.
Harvest: the last calls
Close to harvest the questions change: late-season pest pressure, timing, and what the crop is telling you about the program. In tree nuts, hull split brings its own pest timing that’s worth getting right.
Post-harvest: the part people skip
After the crop is off, the trees are already setting up next year. Post-harvest is when soil gets sampled, the fall program gets decided and the season gets reviewed honestly: what we did, what it cost, what we’d change.
What you should see in writing
- A written recommendation whenever something needs doing: what, why, the rate, the timing and the cost.
- A note from every visit, including the ones where the answer is “leave it alone”.
- Lab results with an explanation, not just a PDF forwarded from the lab.
- A plan and budget up front, and a review at the end.
If you’re not getting those, ask for them. That’s the job.