Resistant crop pests: which are a problem?

Insecticide resistance in pests found in UK crops is not new, but an increasing number of insect species are now able to tolerate some of the chemistry used to control them.

Experts believe this is largely due to overuse of insecticides and applications at lower rates than those recommended on the product label. Hard-to-control pests are now becoming a problem in a variety of crops, including cereals, oilseeds, potatoes, peas, beans, field vegetables and in grain stores.

Here, Crops identifies which pests have developed resistance, which chemical group or groups they are resistant to and which crops they affect. It should be noted that three of the pests only have suspected resistance and cases of control failures are being investigated.

Resistant crop pests

Peach potato aphid Grain-Aphid Cabbage-Stem-Flea-Beetle
Peach potato aphid Grain aphid Cabbage stem flea beetle
Crops affected:

Oilseeds

Potatoes

Sugar beet

Vegetable brassicas

Crops affected:

Cereals

Potatoes

Crops affected:

Oilseeds

Vegetable brassicas

Resistant to:

Pyrethroids

Carbamates

Resistant to:

Pyrethroids

Resistant to:

Pyrethroids

Pollen-beetle pea-and-bean-weevil-by-Blackthorn-Arable seed-weevil-adult
Pollen beetle Pea and bean weevil Cabbage seed weevil
Crops affected:

Oilseeds

Vegetable brassicas

Crops affected:

Peas

Field beans

Crops affected:

Oilseeds

Resistant to:

Pyrethroids

Resistant to:

Pyrethroids

Resistant to:

Pyrethroids (suspected)

bruchid-beetle Saw-toothed grain beetle
Bruchid beetle Saw-tooth grain beetle
Crops affected:

Field beans

Crops affected:

Stored grain

Resistant to:

Pyrethroids (suspected)

Resistant to:

Pyrethroids (suspected)