Jag går bet, tror det är ett kraftigt svampangrepp snarare än rotsnurr mm men är inte säker. Har googlat om svampangrepp på hela lonicerasläktet, och det närmaste jag fann var denna beskrivning på släktingen kaprifol (nedan).
Med en så kraftig och snabb reaktion som verkar drabba hela plantan och som man inte kan artbestämma skulle jag grävt upp, studerat rötter, skurit i veden, tagit närbilder och sedan bränt/kasserat. Visserligen har somaren varit extremt fuktig och nästa kan bli torrare, kanske kan plantan överleva detta och kanske är angreppet speciellt just för blåbärstry eller för just denna individ, men jag skulle inte ha chansat.
Blåbärstry är som sagt en Lonicera, och kanske kan detta vad-det-nu-är få fäste i andra Loniceras.
Jag skulle tro att SLU kan vara intresserad av att få se bilderna och kanske kan någon där svara med säkerhet.
Leaf Blight of Honeysuckle
Symptoms
Symptoms are commonly seen on young foliage first. Infected areas are initially slightly crinkled or rolled. Veinlets and the tissue around them becomes infected and turns yellow. The affected area later turns brown. Lesions enlarge and coalesce with age. A zone of yellow tissue surrounds the affected area and large veins may remain green while interveinal tissue becomes necrotic. Eventually large areas of the leaf become affected. The tissue becomes brown and dry, causing leaves to curl and twist. Most of the leaves on a shoot may become infected giving the appearance of shoot blight. However, woody tissue is not infected. Premature defoliation occurs with heavily infected leaves. A thin white layer of fungal growth is evident on the lower surface of infected leaves. The mat resembles the type formed with a powdery mildew infection but does not contain black fruiting bodies (cleistothecia). It also occurs on the lower surface of rolled leaves rather than on upper, flat surfaces.
Honeysuckle (Lonicera spp.) is a popular plant used in landscapes and windbreaks in the U.S. and Canada. Unfortunately it has some rather serious diseases and insect problems. One of its most common maladies is leaf blight. This disease occurs from the Great Plains eastward and in the Pacific Northwest. It also occurs in countries outside of North America. Leaf blight can be found in windbreak and landscape plantings but tends to be most severe in nurseries. The causal organism is Insolibasidium deformans (C.J. Gould) Oberwinkler & Bandoni. The host range is limited to the honeysuckle family. Most species and varieties of honeysuckle are susceptible. The fungus overwinters as mycelium and/or basidiospores in dead leaves. Basidiospores serve as primary inoculum. They are released in the spring during periods of high humidity. Optimum discharge of spores occurs between 14-21oC. The optimum range for germination is similar (14-26oC). The greatest amount of infection occurs on leaves less than 20 days old when temperatures range between 59-64oF and the relative humidity is near 100% for two days. The fungus continues to sporulate throughout the growing season during and after rainy periods. Basidia are produced on hyphae that emerge through stomata. A mat of basidia and basidiospores forms on the lower surface of infected leaves. Basidiospores are produced on basidia and serve as secondary inoculum. Conidia are produced on the same fungal mat during the summer. Environmental conditions that favor basidiospore production also favor conidia production. Conidia are not released from the mat. They are presumed to function as resting spores.
Källa
http://nu-distance.unl.edu/homer/disease/h...dy/HoLfBlt.html
Blåbärstryn vissnar, varför?
16-07-2012, 21:41
