. L'enciclopedia di pratica orticoltura; un sistema di riferimento di orticoltura commerciale, coprendo la pratica scientifica e fasi di orticoltura, con speciale riferimento alla frutta e verdura;. Il giardinaggio; frutta-cultura; giardinaggio di vegetale. V MALATTIE APPLE 461 isolato da diversi tipi di piante si sono dimostrati facilmente cross-inoculable artificialmente per numerose altre specie in diverse famiglie di piante. Più di uno orchardist ha anche avuto prova pratica del cross in- fection attraverso il suolo contaminato. Con- sequently sapienti coltivatori esitato a mettere a rischio la possibilità di trasmettere la corona

• Collaboratore: Central Historic Books / Alamy Foto Stock
• ID dell’immagine: PFXKR5
• Dimensioni dei file: 7,1 MB (524,5 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1797 x 1390 px | 30,4 x 23,5 cm | 12 x 9,3 inches | 150dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. V APPLE DISEASES 461 isolated from several kinds of plants have proved easily cross-inoculable artificially to numerous other species in different plant families. More than one orchardist has also had practical proof of cross in- fection through contaminated soil. Con- sequently wise growers will hesitate to risk the chance of transmitting crown gall from one kind of cultivated crop to another by planting susceptible varieties in ground from which plants diseased with crown gall have recently been rooted out. In the following paragraphs we give some information regarding the character and seriousness of crown gall as it ap- pears on some of the more important cultivated fruits: The Apple Upon seedlings and root-grafted trees in the nursery we find principally the hairy root condition or galls of a some- what fleshy nature. (See Fig. 2, A and B.) On older trees the persistent peren- nial hard galls are more frequent and in the orchard there appears also upon the trunks and branches an aerial form of the disease. Aerial tumors are rarer than the root or crown form in most localities. They are characterized by the growth of smooth, woody, persistent swellings, which later become warty from the ap- pearance of numerous stubby roots which break out just to the surface. It is not possible for us to state at present exactly how these aerial tumors originate, but the causal organism is similar to that pro- ducing other forms of crown gall. Crown gall and hairy root are very prevalent in the nurseries, and because of laws forbidding the sale of trees affect- ed with this contagious disease, the an- nual loss to nursery men is very large. Unscrupulous dealers sometimes cut off the galls and sell the trees, but tumors may reappea

Parole chiave associate all'immagine

• bookcentury1900
• booksubjectfruitculture
• booksubjectgardening