Weevil Control: a Cape Town guide

Know what you are dealing with

The rice weevil, Sitophilus oryzae, is the one most Cape Town households meet, a tiny dark brown beetle with four faint orange spots and a long snout, found in rice, maize, pasta and wheat-based products. Its close relative, the maize weevil, looks almost identical and is common in maize meal, samp and mealies stored in bulk, including on Boland farms. The granary weevil cannot fly, has no spots and is mostly a problem in stored wheat and barley in mills and silos. Bean and pea weevils are actually seed beetles rather than true weevils, but people call them weevils because they leave round holes in dried beans, lentils and peas. Garden weevils that chew plant leaves are a separate problem and are not covered by a pantry treatment.

Myths, mistakes and lesser-known facts

Sealed containers protect your other food from weevils, but they also contain an infestation if you buy a bad bag, so you only lose that one container.

For landlords and tenants, weevils are almost always a food storage issue rather than a building issue, so they are usually the occupant's to deal with.

Freezing is a simple trick that most people do not know. A few days in the freezer kills weevil eggs and larvae hiding inside the grains.

Warning signs

Can you do it yourself?

For a weevil problem in a home kitchen, a ruthless clean-out and sealed containers solve it most of the time, and you probably do not need us. Where it gets harder is when you keep finding weevils weeks later, which usually means one forgotten source, or when there is a lot of stored grain at stake. Do not bother with insecticide sprays in the pantry; they do nothing to the larvae inside the grain.

Seasonal pattern

Weevils breed much faster in warm conditions, so infestations that began unnoticed in winter usually show up between November and March. A rice weevil can go from egg to adult in about a month in summer heat, compared with several months in a cold Cape winter. Warm, humid pantries can keep them active all year.

Prevention checklist

• Store rice, maize meal and samp in airtight glass or thick plastic containers, because weevils chew through thin plastic bags and cardboard.
• Freeze new bags of rice or flour for three or four days before you store them if weevils have been a problem before.
• Use older stock first and avoid topping up a container with new grain on top of old.
• Check dried beans and lentils for small round holes before putting them in the cupboard.
• Keep grain away from the warmest spots in the kitchen, like the cupboard above the oven or next to the geyser.
• On farms and smallholdings, clean out silos and bins completely before refilling with new harvest.

What affects the price

For a home, the price mostly depends on how many cupboards are involved and whether the weevils have spread into other rooms. For businesses and farms, the volume of stored grain, how it is stored and whether fumigation is needed are the big factors. We quote for free, and food businesses with ongoing risk often prefer a contract with regular monitoring.

Frequently asked questions

Areas we cover for weevil control