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6 smart scouting tips for ornamental growers
A problem avoided is a problem solved, according to the old saying — and in few settings is that truer than in greenhouse or nursery, where pest and disease pressure can go from zero to “OMG” in a matter of days. That’s why it’s essential to have a strong scouting program in place, along with well-trained staff or trusted consultants to spot insects and diseases early.
While the details of a scouting program will — and should — vary by geography or crop, following a few key guidelines will help you get the most from your efforts and stay ahead of potentially damaging outbreaks.
- Set a scouting schedule — and stick to it. Whiteflies can reproduce almost year-round in greenhouses, and female thrips can start laying eggs just days after emergence. That’s why it’s critical to schedule scouting that reflects seasonal pest and disease pressure. Weekly scouting should be the minimum, with more frequent checks when weather or environmental conditions favor outbreaks.
- Scout the whole greenhouse. Weekly scouting may sound like a lot, especially for smaller operations. Large or small, it helps to divide the greenhouse or nursery into sections and scout one or more sections each day — ensuring the entire facility is covered weekly. Pull plants from hard-to-reach areas and don’t overlook those near doors or other entry points; pests often enter the same way people do — through the door — and attack the first suitable plant they find.
- Use the right scouting methods. Different pests require different techniques, so make sure you’re using every appropriate tool. Sticky cards help monitor flying pests like whiteflies— a good rule of thumb is three to five cards per 1,000 square feet. Spider mites are usually found on leaf undersides, and should be visible through a 10x magnifying lens. Keep that magnifier and a good ID guide handy for spotting disease symptoms such as leaf spots, wilting or discoloration.
- Keep detailed records. The only way track pest or disease trends is with reliable data. Many Extension services offer free downloadable scouting sheets — a great tool to standardize recordkeeping and improve tracking over time.
- Set thresholds and act fast. Only you and your agronomist can determine what level of pest or disease pressure is acceptable, but what’s equally important is having a plan. Act immediately when thresholds are reached. Know which pests and diseases are likely for your operation and season so you can have the right products on hand and be ready to spray or treat without delay.
- Don’t just look for pests. While scouting for insects and disease, also evaluate overall plant health and look for signs of stress. Check irrigation, ventilation and environmental controls as you go — you never know what small issue you might catch early and prevent from becoming a bigger one.
Regular scouting may feel time-consuming, especially for smaller operations with limited staff. But experienced nursery and greenhouse growers know that time invested in careful scouting pays off in healthier, more vigorous plants and more satisfied customers.
If you’d like to know more about how Corteva Agriscience™ Turf & Ornamental products can help prevent and control pest and disease issues, sign up for updates here.
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