Agrobacterium tumefaciens is the causal agent of crown gall disease (the formation of tumours) in over 140 species of eudicots. It is a rod-shaped, Gram-negative soil bacterium. This gall growth is first noticeable when it becomes about twice as wide as the rosecane it is on. At this early phase, each larva is small and does not eat much at all. The most common is crown gall (Agrobactrium tumefaciens) which affects over 40 families of plants. Canegall of brambles and hairy root of apple are also caused by bacteria. Adult rednecked cane borers attack foliage, often feeding on the upper leaf surfaces during the day leaving irregular holes. Larvae feed on primocanes and form irregular swellings or galls. Cane borers are insect larvae that tunnel into rosecanes, causing wilting and dieback of the affected stems. Symptoms include a sudden wilting of a cane, often with a small hole visible... Cane borers are sneaky pests that can do some real damage to your berries, roses, and sugarcane plants. Here's how to stop them. As galls grow larger, infected canes split and dry out. Symptoms on severely infected canes include stunting, leaf chlorosis, small and seedy fruit, wilting, and possibly death. The adult is a dark brown snout beetle about 1/8 inch (4 mm) long that looks like the grape cane girdler. The legless grub is white with a brown head and slightly larger when full grown. A wasp rosecanegall on a leaf in Oxfordshire, UK.Photograph: Geoffrey Swaine/REX/Shutterstock. Share. A water vole sits next to a chalk stream that feeds into the Norfolk Broads. Get offen here. I knows ye. Yer one o’ that gang o’ bums that come here last night, an’ now you got the gall to come back beggin’ for food, eh?
