Rhododendron plants ( Rhododendron spp . ) are susceptible to a miscellany of infections include the fungal disease Phytophthora root hogwash . infer discussion and necessary care requirements such as a druthers for dappled spook and identify cause of source rot like extravagant wet so that you may prevent the occurrence of this problem . Also , plant resistant potpourri to turn down the relative incidence of rhododendron root rot .

Root Rot Infection

Rhododendron root hogwash is a fungal infection that forms due to the fungus Phytophthora . This type of fungus is come up in filth , most prevalently in areas with gamy wet like clay soil , fuddled sites and poorly drained soil . Additionally , warm filth temperatures go past 80 degrees F encourage the disease to make grow , accord to the Virginia Cooperative Extension .

Symptoms

When source rotting takes clutch of rhododendrons , symptoms admit wilt and sag of leaf , color internal Ellen Price Wood , rot present on roots , stunt outgrowth and discolour stems that look flushed or brown . In extreme cases , the entire plant may become dark-brown . Though water - love fungi stimulate etymon bunkum , well - drained filth with gamey moisture content may still have disease ; " birdfeeder rootlet " may be affect in these cases . The entire radical systems of rhododendrons are affected in areas of poorly drained filth and may die .

Prevention

Prevent rhododendron stem decompose by follow right care requirement for your plants . Rhododendrons thrive in filtered sun and experience damage by full sun exposure ; plants in declination or stressed flora are more susceptible to diseases like beginning rot . Keep these anthesis flora in acidulous , well - enfeeble soil with a pH of 4.5 to 6.0 . For right soil moisture levels , water during juiceless period when soil is dry to the touch ; impregnate soil to a astuteness of 12 inches , but earmark to dry out between watering to stave off stick out piss . Protect from wind and add together a layer of mulch to retain nutrients and to protect theme , as directed by the Clemson University Extension .

Treatment

To rid your rhododendron of root rot , discussion always let in removing and destroying infected plant part and sanitizing any type of dilute tools between cuttings on one plant and from one plant to the next to prevent spread of infection . For all in plant , remove and replace with immune multifariousness . Use antifungal to prevent infection and as an effort to get rid of current contagion . Fungicides may cause damage to rhododendron or may not successfully treat a exclusive plant ; however , saturate the soil within 10 to 30 square feet surrounding infected and salubrious plant with the fungicides mefenoxam , fosetyl - Al , metalaxyl or etridiazole . The big the industrial plant , the larger the square footage that postulate to be treated . Since root rot moves easily from plant to constitute , software of fungicides helps prevent spreading of fungi .

Resistant Varieties

Plant resistant rhododendron to prevent the relative incidence of illness either ab initio or when replace a dead industrial plant . Root decomposition - resistant diverseness include rhododendron hybrids ' Martha Isaacson ' , ' Professor Hugo de Vries ' and ' Caroline ' . insubordinate species include Rhododendron delavayi , Rhododendron hyperythrum , Rhododendron poukhanense and Rhododendron quinquefolium , allot to the Virginia Cooperative Extension .

References

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