Phoma on oilseed rape leaf

Oilseed rape diseases can be caused by a variety of factors, including fungal, bacterial or viral infections, pests and insects, and environmental stress.

Oilseed rape diseases can reduce crop yields and lower the quality of the harvested seed oil, leading to economic losses for farmers. To prevent and control oilseed diseases, farmers can use a combination of cultural practices, such as crop rotation and sowing date, and chemical treatments, such as fungicides and insecticides. It is also important for farmers to monitor their crops regularly for signs of disease and to promptly implement control measures when necessary.

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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.

Diseases infect susceptible plant hosts, where environmental conditions favor disease development. Infected crops achieve lower yields and the quality of the produce can also be affected.

Oilseed Rape is the most widely grown break crop in the UK. The seed is crushed to produce vegetable oil and the remaining rapeseed meal is a high protein animal feed. 

Light leaf spot (LLS) is a disease of oilseed rape and some vegetable brassicas, caused by the fungus, Pyrenopeziza brassicae. This major foliar pathogen is notoriously difficult to identify with an airborne polycyclic lifecycle – capable of several infection cycles a season, making it hard to control as reinfection is constantly occurring. Severity can be suppressed through monitoring, cultural controls, and targeted fungicide applications.

The Defra Pest and Disease survey has been running for approximately 50 years and monitors endemic pests and diseases in winter wheat and winter oilseed rape, along with accompanying information about agronomic practice and pesticide inputs to the crop.

Phoma leaf spot and stem canker is one of the most damaging diseases in oilseed rape, caused by two closely related fungal pathogens: Leptosphaeria maculans (Plenodomus lingam) and L. biglobosa (P. biglobosus).

Verticillium stem stripe is a challenge to identify, especially when other diseases are present. However, because of a lack of chemical control, it is important to locate high-risk fields, so rotational strategies can be adapted.

Several diseases affect oilseed rape. However, it is possible to suppress the risk of economic damage by combining non-chemical and chemical approaches.

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