Bruchid beetle

Bruchus rufimanus is a widespread pest of beans. Adults are 3.5 - 4.5 mm long, squat shaped, black or dark-bown with small grey flecks

Damage

Grubs feed in field beans and when adult beetles emerge they leave a circular hole in the seed. High levels of damage or infestation mean that beans are not acceptable for human consumption in the export trade. The bean seed beetle, Bruchus rufimanus, is now widespread in all varieties of winter and spring field beans and also broad beans, in many parts of the UK (but more in the South East). Adults fly to beans from overwintering sites during May and June and lay eggs on developing pods. Egg laying is concentrated on pods set on the lower third of the plant. Many beetles emerge before harvest but emergence often also takes place in store.

Management recommendations

Spray timing is critical. Based upon the simple criteria of pods being present, and the temperature having reached at least 20 oC on two consecutive days, beans are at risk from bruchid beetle attack. A spray is recommended if adults are found in crop when this temperature threshold is exceeded. A second spray should be made 7-10 days later. Lambda-cyhalothrin products such as 'Hallmark' are available for use during flowering under Extension of Authorisation for Minor Uses. If the spray is applied through angled nozzles or twin caps angled both ways using a medium spray quality, control is significantly improved. Insecticide should be applied in the early morning or evening to avoid direct contact with bees.

BruchidCast is designed to aid the timing of insecticide applications by giving up to five-day advance warning of periods of peak pest activity by post code area.

Recent trials conducted by PGRO suggest that delayed drilling of beans can reduce bruchid risk.

 

The information on this page comes from Croprotect which is sponsored by the BBSRC NERC Sustainable Agriculture Research & Innovation Club

Related Organisations

Content below is from across the PEP community and is not necessarily endorsed by Stewards or by PEP

Connected Content

Integrated Pest Management (IPM)

Integrated Pest Management highlights the growth of a healthy crop with the least possible disruption to agro-ecosystems and encourages natural pest control mechanisms. IPM is one of the tools for low-pesticide-input pest management, and IPM must now be implemented by all professional agchem users.

Pulse Crops

Pulses are leguminous crops harvested for dry protein-rich seed, with peas (pisum sativum) and beans (vicia faba) being the major crops in the UK.

NCSPulse PEP
Pests

Invertebrate pests cause problems in agriculture when the level of injury they cause reaches a point where the crop yield is significantly reduced.   

Beans

Field beans (vicia faba) are a widely grown break crop across the UK on around 170,000 ha. 

Pulse PEP
Croprotect

App and website dedicated to pest, disease & weed identification and management.

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