The name Carya illinoensis is derived from the Algonquin word " pacane . " The American Forests Organization states that pacane means " a nut so hard as to require a I. F. Stone to crack . " The botanic name for the pecan tree is Carya illinoensis ; it is a Sir Herbert Beerbohm Tree that has existed in America for over 8,000 years . This glorious tree is native only to North America . It is found in states from Illinois to Texas . The pecan tree is grown for shade as well as its nuts . Besides rose window disease , pecan Tree are susceptible to scab , powdery mildew , splodge , Sir Henry Joseph Wood or heart rots , intragroup breakdown of nuts and crown gall .

Rosette Disease

Rosette disease is a atomic number 30 inadequacy , and it is a common trouble with pecan trees . Zinc is one of the important nutrient that helps pecan trees to produce . It is not needed in as high concentration as other nutrient , such as N ( 25,000 ppm nitrogen and 50 ppm zinc ) . The pecan tree diagram require atomic number 30 to produce hormones . These internal secretion start the cells to enlarge in both its radical and leaf .

Symptoms of Rosette Disease

If the stain is deficient in zinc , you will mark that the leaves of the pecan tree will be small , greensick and on an irregular basis shaped . In extreme case of Rosette disease , the pecan nuts will also be affect – they will be of scummy lineament and there will be fewer pecan nuts . Rosette disease unremarkably appears within two to three years after planting . The disease buzz off its name from the symptoms of the disease . As the disease progresses , there are an over copiousness of smaller leg formed . This excess of smaller ramification pulls the leaf together , which make it count like a russet scab – thus the name , " rosette disease . "

Foliar Treatment

The diseased pecan tree can be address with a foliar app of zinc . In some pecan farms where there is a history of the disease , program of atomic number 30 compounds is done yearly . Foliar treatments should be give as the foliage develop , early on in the maturate season . The treatment will then be done each workweek until the leave are fully form . ( For young Tree , the treatments in general continue until the end of July . ) Mature pecan trees usually require five treatments . ( The atomic number 30 compound is apply when the bud break and then every two weeks . ) ( Due to the height of most pecan trees , foliar treatments are almost impossible for the homeowner . )

Soil Treatment

Foliar treatment is more efficacious than soil handling if the grunge is extremely alkalic . When treating the territory , Zn chelate compound are applied in early spring when the bud first appear . ( The soil may be treated even when the Tree do not have any leaves . ) grease applications programme consists of spreading atomic number 30 from the torso ( outward ) to the drip line of the Sir Herbert Beerbohm Tree . The rule of thumb when it comes to the amount of zinc that should be applied is ½ Ezra Loomis Pound of zinc for every inch of the diameter of the trunk .

Rosette and Bunch Disease

Bunch disease has similar symptoms of rosette disease . However , with bunch disease there is no yellowing between the veins of the leaves , and they do not become crinkled . Scientists think that bunch disease is due to a phytoplasma . There is no treatment for bunch disease .

References

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