Managing the Late-Summer Nectar Dearth Without Losing Colonies

Why the late-summer lull is dangerous

In much of the UK the main flow tails off through July and by August many hedgerows and fields have nothing left to offer. Bramble, lime and field bean finish, oilseed rape is long gone, and the next reliable source - ivy - is still weeks away. This gap between flows is the late-summer dearth, and it lands at an awkward moment: colonies are still at or near their peak population from a summer of brood rearing, so there are a great many mouths to feed and very little coming in through the entrance.

The risk is not simply hunger. A colony that has been drawing down stores steadily rather than building them faces winter with a smaller cushion, weaker or older bees rearing the last rounds of brood, and a higher chance that a queen already flagging after a hard season will fail before autumn. Dearth mismanagement in August is one of the more common, and more preventable, causes of colonies that look fine in September but are dead by February.

Reading the dearth before you act

Not every colony needs the same response, so the first job is an honest assessment rather than a blanket feeding programme. Hefting the hive from the back gives a rough sense of stores; a colony that feels alarmingly light needs attention sooner than one that still has a reasonable super or two of capped stores. Look at the brood pattern as well as the weight - a queen that has slowed her laying rate is a normal, sensible response to a dearth and is not itself a problem, but a pattern that has gone patchy or spotty alongside declining stores suggests a colony under real stress.

Also watch behaviour at the entrance. A calm, orderly pattern of foragers coming and going is fine even if the numbers have dropped. Bees investigating other hives, fighting at entrances, or a sudden spike in wasps and robber bees loitering nearby are early warnings that the dearth has tipped into a robbing situation, which can undo weeks of careful management in an afternoon.

Feeding through the gap without inviting trouble

Where stores are genuinely short, feed a 2:1 sugar syrup (by weight) rather than the thinner 1:1 mix used for spring stimulation - the thicker syrup more closely resembles the concentrated stores bees need for winter and requires less processing and evaporation, which matters when nights are already cooling. Feed in the evening after flight has largely stopped, using an internal or rapid feeder rather than an open tray, and take up any spilt syrup immediately. A pollen patty is worth adding only if there is genuinely little pollen coming in and the colony still has brood to raise; do not feed protein into a colony that is already winding brood rearing down of its own accord.

Resist the urge to feed generously to every colony regardless of need. Overfeeding a colony that already has adequate stores wastes syrup, can encourage nuisance robbing behaviour from the fed colony itself, and in a bad case can leave so little empty comb that the queen has nowhere to lay in autumn.

Robbing prevention in practice

Robbing is the defining hazard of this period, and prevention is far easier than intervention once it starts. Reduce entrances to a size a single guard bee can defend - a matchstick-width gap is often enough for a strong colony, smaller still for a nucleus. Avoid opening hives in the middle of the day when robbing pressure is highest, and keep inspections brisk; a hive standing open with exposed comb and syrup is an open invitation. If you must feed during the day, do it inside the hive with the roof back on promptly.

If robbing does start - a cloud of agitated bees at one entrance, bodies fighting on the landing board, wax cappings on the ground - close the entrance right down immediately, even to a single bee space, and consider draping a damp sheet or robbing screen over the front of the hive for a day or two. Once a colony has been targeted it often remains a target, so keep entrances reduced for the rest of the dearth rather than reopening them at the first sign of calm.

Consolidating weak colonies

The dearth is a natural point to be honest about which colonies are pulling their weight. A colony that has struggled all season, is queenless, or is running on a handful of frames of bees is unlikely to build up enough before autumn to survive winter on its own, and it is also a magnet for robbing. Uniting a weak colony to a stronger one using the newspaper method converts two marginal units into one that stands a real chance, and it is far kinder than watching a small colony rob out or starve later in the year.

For colonies worth keeping separate, this is also the point to remove any remaining supers that are not going to be filled, tighten the brood box down with a dummy board if numbers have thinned, and note which queens need replacing before winter rather than in a rushed spring inspection.

Using the quiet weeks to prepare for winter

Because there is little else demanding attention during a dearth, this is a sensible window to get ahead of autumn jobs. Mite counts taken now - via an alcohol wash or sugar roll - reflect the population building toward the critical autumn peak, and treating promptly if numbers are climbing gives the bees that raise the long-lived winter cluster the best chance of doing so with a low mite burden. It is also a good time to check queens are laying well, order in autumn feed and any winter equipment, and plan which colonies will need extra insulation or a smaller entrance reducer once the cluster forms.