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.
Is it really a weevil?
The snout gives it away. Rice and maize weevils have a long, narrow snout poking out in front of the head, a bit like a tiny elephant trunk. Plenty of other small kitchen insects get called weevils without one, and the fix is not always the same.
Flour beetles
Reddish brown, flat and snoutless, flour beetles live in flour, bran and cake mixes rather than whole grains. They cannot get into a sound grain of rice, so if your rice is clean but the flour is moving, you are looking at a different problem.
Biscuit beetles
Small, round, reddish and slightly hairy, these bore into dry pasta, spices, stock cubes and dog biscuits. They are often mistaken for weevils because they also leave tiny round holes.
Booklice
Pale, soft and smaller than a pinhead, booklice turn up in damp pantries in winter, especially in coastal suburbs and older houses with poor airflow. They feed on mould on the food and packaging, so the cure is drying out the cupboard, not throwing out the rice.
Grain borers
The lesser grain borer is dark brown and cylindrical, with its head tucked down under the body so you cannot see it from above. It also breeds inside whole grain, so the clean-out is similar, but there is no snout and it looks more like a tiny piece of twig.
Where weevils hide when the pantry is clean
If weevils keep appearing after you have cleared every shelf, the source is usually something nobody thinks of as food. Check these:
- Microwave heat packs and neck warmers filled with wheat or rice.
- Decorative jars of beans, dried mealies on the cob and seed-filled draught stoppers.
- Children's craft boxes with macaroni, lentils or dried pasta shapes.
- Chicken feed, horse feed or wild birdseed in the garage, shed or stable.
- The emergency bag of samp or rice at the back of a top shelf.
- A packet of popcorn kernels in a drawer that has not been opened since last winter.
Mistakes that keep weevils in the kitchen
- Binning the bag indoors. Rice weevils can fly. An open bag in the kitchen bin becomes a new source for the next week. Seal it in a plastic bag and take it straight to the outside bin.
- Refilling an unwashed container. Pouring fresh rice into the same jar without washing and drying it gives any survivors a fresh meal.
- Ignoring the shelf liner. Paper and plastic liners trap grain dust and eggs underneath. Lift them out, or better, throw them away.
- Leaving the shelves wet. Scrubbing a cupboard and restocking it while it is still damp invites mould and booklice. Wipe it down and let it dry overnight with the doors open.
- Freezing the wrong bag. Freezing kills eggs hidden in new grain, but putting a heavily infested bag in the freezer only gives you a frozen bag of dead weevils to throw away later. Freeze new stock, and bin the old.
Weevils on farms and smallholdings
On smallholdings in Philippi and the farmland around Durbanville, Paarl and Wellington, the weevil question is about volume: maize kept for animal feed, wheat for the chickens, bags stacked against a damp wall. Raise bags off the floor on pallets, keep feed stores dry and ventilated, and try to use up old feed before the summer heat speeds up breeding. Where a whole store of grain is affected, fumigation may be the practical answer, and we would inspect first and tell you honestly.
For how we treat weevils in homes and businesses, see weevil control in Cape Town. If you are also seeing moths or beetles in the pantry, stored product pest control covers the wider group. Pick your suburb below for local notes.
Quick answers
Do bay leaves keep weevils away?
There is little evidence they work. Airtight containers and freezing new stock are far more reliable.
Are the weevils in my beans the same as in my rice?
No. Bean weevils are seed beetles that only attack pulses, while rice and maize weevils attack grain, but the clean-out and storage advice is much the same.
Can you treat weevils in a silo or warehouse?
Yes. Larger stores may need fumigation or regular monitoring, and we will inspect and quote for the right approach.