Willow tree diagram are a favorite among tree diagram lovers for their dramatic , graceful appearance . The willow tree ( genus Salix ) is often found along river and stream , but will grow well in almost any orbit . willow thrive in full sunlight and conform well to all types of dirt ; they are sometimes helpful in prevent dirt erosion . The willow is prone to several diseases that damage the leaves , wood and , in severe cases ; may make the death of the tree .

Willow Scab

because of the fungus Fusicladium saliciperdum , willow scab is one of the more serious disease that affect willow tree . Damp , wet weather condition creates lucky condition for the spread of this infection . Oddly - regulate brown spots appear on the leaf surface along the chief veins and midribs . Spots turn Olea europaea green as spore begin to organise . Younger leave are especially prostrate to willow scab and may have topographic point all along the midvein and nervure . Badly infect leave will dry up and drop . The fungus will spread into the twig or untried branch and dark cankers may develop which results in the die - back of branches and twigs . handle willow tree scab with a Cu fungicide ; always follow manufactures instruction when using chemical substance . Enlist preventative measures by pruning tree of dead branchlet and branches , rake up all fallen leaves and morbid matter and combust .

Crown Gall

poll gall is a bacterium that causes tumors , often called galls , to form on the ascendent and stems and sometimes , the branch of willow trees . Small , round , light - coloured knots seem on the ascendent , slowly becoming heavy and more numerous as the tree diagram grow . They finally will encircle and surround the septic area of the origin or stem and will cause developmental problems . Leaves are discolored , die - back becomes rife and the growth of the tree diagram is stunt . Crown gall also makes trees more susceptible to other diseases that can enter the rotting galls . There is no known discourse of crown gall . The effective resort is to remove and destroy willow tree tree that have been infect with peak gall .

Cytospora Canker

Various species of the fungus cytospora get cytospora canker to appear on willow tree trees . The fungus will assail trees or portion of the Sir Herbert Beerbohm Tree that are emphasize or in a de-escalate condition . The fungus spring up in the bark and Grant Wood and finally damage the tree diagram . Symptoms are yellow , smuggled or brownish - orange tree discolour areas on the bark of the tree . Cankers , pimple - similar blackened dapple , seem on the bark of the Sir Herbert Beerbohm Tree . The canker produce spores , which under moist condition , will leak out from the cankers in long , orangish , screw thread like tendril . Wood and inner bark may appear to be reddish brown in colouring . Dead barque will remain committed to Tree for years before falling off in piece . curb cytospora canker is intimately done by asseverate the health of your tree diagram . Wounds triggered by lawn equipment leave your tree susceptible to canker sore . Once canker occur , remove all infected branches and make clean even cuts on branches that have jagged edges . Clean wise combat injury by removing pathological area , in older wounds remove loose pieces of bark . Do not apply dressings to the wound ; allow them to dry out out .

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