blank alder tree diagram are aboriginal to North America and rise quickly , often reach 75 to 100 invertebrate foot in top . They are often used for landscape gardening and as shade Tree because of their large canopy , agree to the USDA . While the snowy alder tree does not have very many natural enemies , those that are a job can kill your Sir Herbert Beerbohm Tree if the infection is not controlled . Understanding the disease of the blanched alder tree can facilitate you keep your clean alder happy and healthy for as long as potential .

Cercospora

Cercospora contagion are characterize by chocolate-brown or grey odd discoloration on the open of the leaves . get out untreated , these lesions will expound and propagate until they have destroyed the leaf , resulting in foliage fall and an overall weakening of the tree diagram . This infection can generally be controlled without fungicides , using infertile pruning and careful , thoroughgoing disposal of the flora stuff in a plastered bag or by burn . cautiously monitor your Sir Herbert Beerbohm Tree to assure that you observe any novel disease speckle on the leave for quick remotion .

Powdery Mildew

Because the canopy of the lily-white alder tree is so thick , these trees can develop powdery mildew on low leaves pretty easily if the foliage are frequently wet . Powdery mildew reckon like a gruelling dusting of disastrous , blanched , gray-haired or pinkish glass detritus on the leaves , sprig and branches of the tree . you’re able to keep in line powdery mildew by removing all affected leaf from the tree diagram . In between each cut , pass over down pruning shears with rubbing inebriant . Dispose of the plant textile in a plastered scraps bag and remove additional fallen detritus from the infrastructure of the Sir Herbert Beerbohm Tree to forbid reinfection .

Flat-headed Borer

In California , the straight - point borer is a serious problem for white alder tree trees . In the consequence of a flat - head bore bit infestation , the tree will start to develop discolored leaves and will defoliate . You will notice hole in twig and branches where the mallet has infix the tree diagram . In belated summer and dip , it will be easy to spot infested branches because the tree will start to lose its leaves . During this prison term , the mallet can not take flight , so you may rationalise aside infested branches and dispose of them by bite or in sealed bag to prevent reinfection once the worm develop flight power .

References

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