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Science > Agriculture > Field Crops > Grassland, Hay and Forage > Alfalfa > Pests and Diseases

Web Pages

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Alfalfa Disease Management - http://www.ces.ncsu.edu/depts/pp/notes/oldnotes/ad1.htm
Provides information on disease identification, control, field monitoring, scouting and resistant varieties.

Alfalfa Insects: Integrated Crop Management - http://www.ipm.iastate.edu/ipm/icm/2006/5-22/alfalfainsects.html
Photographs and information to help in identification of the many insects to be found in first-cutting alfalfa, both friend and foe.

Alfalfa Leaf Diseases - http://www.ipm.iastate.edu/ipm/icm/1998/5-4-1998/alfdis98.html
Photographs and information on a number of diseases that affect this crop.

Alfalfa Leaf Spot, Pseudopeziza medicaginis - http://www.forestryimages.org/browse/detail.cfm?imgnum=1436036
Photograph of an affected leaf.

Alfalfa Plant Diseases and Damage - http://www.ent.iastate.edu/imagegal/plantpath/alfalfa/
Photographs of plants infected by various pathogens and pests, with links to articles on integrated crop management.

Alfalfa Weevil - http://www.ext.colostate.edu/pubs/insect/05500.html
Information on this important insect pest, Hypera postica, its life history, crop management practices, biological and chemical control, not forgetting the protection of pollinating insects.

Aphids in Alfalfa - http://www.ext.colostate.edu/PUBS/insect/05531.html
Information on the species that affect alfalfa, their management and control, and the protection of pollinating insects, and photographs of some beneficial insects useful for biological control.

Blue Alfalfa Aphid and Pea Aphid - http://www.ipm.ucdavis.edu/PMG/r1300211.html
Both these aphids attack alfalfa and can cause damage. Description, photographs and information on management, monitoring, biological and chemical controls.

Diseases of Alfalfa - http://nu-distance.unl.edu/homer/disease/agron/alfalfa/
Information on various diseases which may affect this crop with photographs of some, the life cycle of the causal agent, the symptoms and plant health management.

Diseases of Alfalfa: Bacterial Wilt - http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/prm7896?opendocument
Photographs and information on how to identify this infection, caused by Corynebacterium insidiosum, and possible management strategies.

Diseases of Alfalfa: Nematodes - http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/prm7899
Information on the damage done by the stem nematode, Ditylenchus dipsaci, with photographs of infected plants.

Diseases of Alfalfa: Non-Infectious - http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/prm7898
Descriptions of physiological disorders, deficiencies, drought and frost damage.

Fungal Diseases of Alfalfa - http://www1.agric.gov.ab.ca/$Department/deptdocs.nsf/All/prm7897?OpenDocument#anthra
An identification guide to the fungal diseases that may infect this crop, with many photographs, brief descriptions of the symptoms and suggested management strategies.

Management of Blister Beetles in Alfalfa - http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?publicationId=628
These insects contain a blistering agent which is toxic to horses and cattle. This article provides information on their life cycle, the serious damage they can cause to livestock when ingested and preventative measures that may be taken.

Managing the Alfalfa Weevil - http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?publicationId=556
The identification and life cycle of the alfalfa weevil are discussed along with economic thresholds and management using cultural, biological and chemical methods.

Potato Leafhopper Management in Alfalfa - http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?publicationId=559
Identification features of this pest, its migratory habits, symptoms of the damage caused and management and control measures that can be taken.

Spotted Alfalfa Aphid - http://www1.agric.gov.ab.ca/$Department/deptdocs.nsf/all/agdex728
Photographs and information on the damage done by this insect, its description, life history and biological and chemical controls.

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