From Farm to Feeder: Can Smarter Spraying Make Poultry Feed Safer?

A poultry farmer can control what happens inside the shed. Knowing what happened to the crops used in a bag of feed is much harder. Maize and soybean are important ingredients in feed mills which is attacked by whiteflies and associated plant viruses. Before maize and soybean reach the feed mill, decisions have already been made about which pesticides to use, how often to spray and when to harvest. Those decisions deserve a place in the discussion about feed safety.

Pesticides help protect valuable crops. Yet a spray applied without a clear need adds an avoidable expense and another opportunity for chemical exposure. Precision agriculture offers a practical way to make these decisions more carefully: inspect the crop, identify the problem and direct treatment where it is needed.

“A poultry farmer can control what happens inside the shed. Knowing what happened to the crops used in a bag of feed is much harder.”

The connection with poultry is straightforward. Pesticide residues may remain in harvested crops and feed ingredients. Depending on the chemical and the amount consumed, some residues can also reach animal tissues or eggs. FAO guidance therefore includes studies examining what happens to pesticides in poultry when relevant exposure through feed is expected. This is a reason for proper monitoring, rather than an assumption that every treated crop produces unsafe feed.

Finding a residue does not, by itself, establish a health risk. The chemical’s toxicity and the level and duration of exposure matter. Maximum residue limits help check compliance with approved agricultural practices; they should not be confused with the exact point at which poisoning begins. Responsible reporting must recognise this distinction.

“Finding a residue does not, by itself, establish a health risk.”

For the crop farmer, improvement begins with a familiar task: walking through the field. Regular inspections reveal which pests are present, how their numbers are changing and whether damage is approaching a level that justifies treatment. Local advice is essential because the appropriate action depends on the crop, pest and growing conditions. A few insects on a leaf do not automatically justify spraying every acre.

Technology can make those observations more useful. A mobile phone can record photographs and locations. Field maps can show where weeds or pest damage are concentrated. Suitable cameras and software can help turn these observations into instructions for a sprayer.

There is evidence that this approach can save chemicals. In a soybean field demonstration reported by Iowa State University in 2024, drone mapping followed by targeted ground spraying used nearly half as much herbicide product as a whole-field treatment, with no significant difference in grain yield. That result concerned weed control in one setting. It does not establish an equal reduction in feed residues or guarantee similar savings against insect pests.

For insects such as whitefly, treatment decisions still need reliable field counts and advice suited to the crop. Mapping a patch does not mean the problem will remain there. Farmers must revisit treated and untreated areas to check whether control has worked and whether the infestation is spreading.

A drone also needs careful operation. Spray coverage, wind, droplet size and equipment settings affect how much pesticide reaches its target. Targeted application should retain the label-approved dose on the area being treated. Saving chemical by avoiding unnecessary treatment is different from weakening the dose and risking poor control.

Feed safety requires attention beyond the spray operation. Farmers should follow harvest and feeding restrictions and record the product, rate, application date and harvest date. Feed manufacturers should ask suppliers for these records, retain batch details and arrange residue testing according to the risks associated with each ingredient. Lower pesticide use is useful, but testing is needed to establish actual residue levels.

For poultry producers, the next useful question to a feed supplier may be simple: what do we know about how these ingredients were grown? A clear answer would bring the crop field and the poultry shed closer together.

“A clear answer would bring the crop field and the poultry shed closer together.”