Mock orange tree diagram ( Philadelphus metal money ) are susceptible to a variety of bacterial and fungal diseases , some of which are not treatable with chemic controller . For prevention of disease , specially those that can not be chemically treated , keep your mock orange trees healthy and vigorous through right maintenance . Always hygienise pruning tools between cuts to avoid the transfer of disease pathogens .
Gray Mold
white-haired mold is a fungal disease that affects mock orangish plant . get by the fungus Botrytis cinerea , as well as other species , grayish mold usually inhabits utter plant tissue paper and then invades accentuate or weakened persona of its legion industrial plant . Healthy plants with wounds are also vulnerable to contagion , concord to the University of Illinois HortAnswers . Blight may come about on all parts of the plant and , as the name suggest , in humid experimental condition , a gray - hued web - like substance configuration on the moved plant parts , resembling gray mould . Since there is no recommend chemical ascendance cure , the best management solution is the appeal and death of pathologic plant component part ; remotion of infected tissue also helps foreclose spreading of disease .
Nectria Twig Blight
Nectria twig blight is a fungal disease of mock Orange River trees . triggered by the fungus Nectria cinnabarina , the contagion come along as canker sore on mock orange plants ; cankers are surface area of infected , dead tissue paper , according to West Virginia University at Davis . Leaves go and hard shoot last may occur . cerise growths may form on cankered areas .
Wounded trees in excessively humid or wet weather condition are most prevalently infected ; ideal temperature for fungal contagion is 70 stage F. Nectria twig blight loosely have only mild price , so while no chemical control is recommended , management may admit dispatch and destroying moved plant region .
Bacterial Blight
Bacterial blight on mock orange plants is due to the bacterium Pseudomonas syringae pv . syringae . symptom admit spots on the plant that appear saturate with water ; daub become very glum , displaying a black-market or chocolate-brown chromaticity , accord to the University of Minnesota Extension . Bacterial blight often attack bemock orangish trees when weather is cool and moisture is gamey . Damage consist of the dieback of shoots as well as foliage deformation . For ascendancy , remove and put down affected plant character and as a chemical substance method , utilise fixed - Cu chemicals labeled for use of goods and services on mock orange plants .
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