Monthly Archives: September 2015

Pest of the week – Light Leaf Spot

Light leaf spot (Pyrenopeziza brassicae) survives the summer months on oilseed rape trash and volunteers. From oilseed rape debris, the fungus develops apothecia which release ascospores that are wind dispersed. These spores are can travel on the wind for several miles, infecting new plants. When a plant is infected, conidiospores are produced which can only infect […]

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Pest of the week – Phoma leaf spot

Phoma leaf spot and the resulting stem canker is caused by 2 pathogens, Leptosphaeria maculans and Leptosphaeria biglobosa. The disease is predicted to cause £100M of damage each season, making it one of the most important diseases of winter oilseed rape in the UK. The disease spreads in the autumn by airborne ascospores that are released […]

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Pest of the week – Aphids

There are many types of aphids: Peach Potato Aphid (Myzus persicae), Bird cherry-oat aphid (Rhopalosiphum padi) and Grain aphid (Sitobion avenae), to name but a few. Aphids pose a threat to crops in several ways; – They feed by inserting their mouth parts into the xylem/phloem of the plant and sucking out the sugary sap. -Damage caused […]

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Pest of the week – Cabbage Stem Flea Beetle

The cabbage stem flea beetle (Psylliodes chrysocephala) and Wessex flea beetle (Psylliodes luteola) cause shot holing leaf damage to brassica plants. Oilseed rape is extremely susceptible to flea beetle attack, with some crops last season being destroyed by them. However, so far this season, damage has been present but hard to find in newly established crops. […]

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