When you suspect a spray kill

A pile of dead bees in front of a hive that was strong last week, across several colonies in the same yard at once. That combination is the signal.

What it looks like

Large numbers of dead and dying adults at the entrance and on the ground in front, often within a day or two of each other, and often worse in the strongest colonies because they had the most foragers out. Some will be trembling, disoriented or crawling rather than dead.

The tell is the speed and the fact that it hits multiple hives together. Disease does not usually arrive in a yard overnight in equal measure.

What else it could be

Say the inconvenient part: most suspected spray kills are not spray kills. Robbing produces dead bees at entrances. So does a cold snap catching foragers out, and so does starvation, which leaves bees dead head-first in cells rather than scattered outside.

Check the obvious alternatives before accusing a neighbor, because that conversation is difficult to walk back and you will need the relationship. A yard with one affected hive and four healthy ones is not a spray kill.

What to do in the first hour

Photograph everything with a timestamp, including the wider yard. Collect a sample of the dead bees and freeze them in a clean container, because testing is only possible if the sample exists and it degrades quickly.

Write down what you saw and when, and what is blooming and being worked nearby. Then contact your state apiarist or agriculture department. Most states have a process for this and some can arrange testing, and the pathway is the state rather than the applicator.

Reporting matters beyond your own case: enforcement and label changes rest on reported incidents, and unreported kills are invisible in exactly the data that would prevent the next one.

Reducing the risk

Register your hives if your state runs a registry, and use the voluntary notification services where they exist, so applicators can find you. Talk to neighboring growers before the season rather than after an incident, and ask to be told before application.

Where a spray is expected and unavoidable, colonies can be shut in or moved, though both are stressful and only practical for short windows and small numbers. Water is the underrated part: a clean water source close to the hive keeps bees off puddles in treated fields.

References