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Control of silver-leaf disease on apple trees

, : Control of silver-leaf disease on apple trees. Fruit Trees (4): 48-49

Silver leaf (Chondrostereum purpureum), a serious disease of orchards in the Changjiang river valley and along the Yellow River, can be controlled to some extent by the following measures: (1) exposing the thick roots during the growing season within a circle of 1.5 m diameter from the trunk, spraying once with a dilute fungicide, dressing monthly with dilute fermented night soil, and earthing-up after leaf fall; (2) pruning away diseased branches and disinfecting the wounds; (3) peeling the trunk bark thoroughly while avoiding injury to the cambium during fine weather in May; (4) applying fertilizers in split doses in an N:P2O5:K2O ratio of 1-1.3:1:1-1.3 jin per 100 jin fruit, and regulating the yield at 1500 kg/mu in order to maintain tree vigour; and (6) injecting kasugamycin into the bark through three 10-cm-deep holes made with a hand drill. (1 jin = 0.5 kg, 1 mu = 0.067 ha.).

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Related references

Chu, E.; Nakazawa, N.; Fukushima, C., 1984: Studies on the silver-leaf disease of apple trees (2). Further observation of the symptoms of apple trees inoculated with mycelia of Stereum purpureum. Young trees cv. Starking Delicious were inoculated with cultured mycelia of S. [Chondrostereum] purpureum in May 1982 and Mar. 1983, then periodically dissected to observe mycelial development and discoloration of the wood. Symptoms on the foliage...

Chu, E.; Nakazawa, N.; Fukushima, C., 1983: Studies on the silver-leaf disease of apple tree (1) Observation of the inoculated apple trees with mycelia of Stereum purpureum. Silvering of the foliage appeared in early June in Starking Delicious trees which had been inoculated with S. [Chondrostereum] purpureum in early May. Mycelia spread from the inoculation site until mid-Sept., concurrently with wood discoloration....

Retina, T.A., 1964: Morphological and anatomical changes in the leaf and stem tissues of plum, apricot and apple trees caused by the silver leaf disease. Low temperatures during the winter of 1955-1956 were a contributing factor in infection of trees with silver leaf. Frost cracks made it possible for the fungus (indentified as Stereum purpureum) to penetrate the cambium, and led to its subsequent...

Miyairi, K.; Fujita, K.; Okuno, T.; Sawai, K., 1977: A toxic protein causative of silver leaf disease symptoms on apple trees. The electrophoretically homogeneous protein obtained from the culture filtrate of Stereum purpureum causes silver-leaf symptoms when injected into apple trees at a dosage of about 25 .mu.g/tree. This preparation has a MW of 32,000 and shows not on...

Grosclaude, C., 1962: Silver leaf of fruit trees. III. The late form of silver leaf disease of peach trees.. Water deficiency and high temperatures are probably either primary or secondary causes of this disorder, and the peach silver mite, Vasates cornutus, is associated with the injury. -Centre Rech. agron. Sud-Ouest, Pont-de-la-Maye.

Anonymous, 1962: Silver-leaf disease of fruit trees III The late form of silver-leaf disease of peach-tree

Pugsley, A.T., 1939: Silver leaf disease of fruit trees. Control measures recommended. A popular account is given of the silver leaf disease (Stereum pur-pureum) which has been recorded from widely separated districts in Victoria on apples, plums, and apricots, but in a few instances only does it appear to have established itself.

Grosclaude, C., 1962: Silver leaf disease of Fruit Trees. III. Late silver leaf of Peach. The micro- and macroscopic characters which readily distinguish this mild, non-parasitic, form of silver leaf from other forms are described. Air in the epidermal layer causes silvering; Ca oxalate crystals are equally present in the upper and low...

Pittevils, J.V.ndergeten, J.H.nrinckx, D., 1979: Prevention and control of the silver leaf disease, Stereum purpureum (Pers. ex. Fr.) Fr. on fruit trees. Revue horticole suisse 52(1): 5-14

Whitelock, R., 1982: Biological control of silver leaf disease Pear trees, Chondrostereum purpureum, Trichoderma viride. Pestology 6(3): 17-19