. Cirtus frutti sotto irragation. Agrumi; frutti-coltura. 38 agrumi sotto IRRKJATiON §*^5 su alberi di grandi dimensioni in questo modo si evita che l'impostazione di un pesante raccolto di frutta. La malattia è facilmente distinguibile da esantema, o morire- indietro, dal ashen colore dei ramoscelli, mentre in die-indietro pro- duces un marrone effetto sui ramoscelli; dalla linea ad anello o la separazione di tessuto leso dal tessuto sano, che è assente nel die- indietro la malattia e dal gelo-come l uccisione di rametti. La malattia è stata descritta per la prima volta in Florida dove è molto comune e dove spesso docs molti danni. In Cali fornia-

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. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 38 CITRUS FRUITS UNDER IRRKJATiON §*^5 On large trees this prevents the setting of a heavy crop of fruit. The disease is easily distinguished from exanthema, or die- back, by the ashen color of the twigs, whereas die-back pro- duces a brown effect on the twigs; by the line or ring separating injured tissue from healthy tissue, which is absent in the die- back disease, and by the frost-like killing of the twigs. The disease was first described in Florida, where it is very common and where it often docs much damage. In Cali- fornia the withertip fungus appears to be less serious than in Florida. The fungus also manifests itself on the fruit in a manner known as tear staining and in California in some seasons this disease on the fruit is very common. Tear staining is characterized by a brownish or dark-reddish stain on the outer surface of the rind. Accompanying this sometimes arc small reddish-colored pits, which sometimes thickly cover the surface of fruit, especially lemons. There also occurs larger dark-red somewhat sunken spots on the fruit in which the withertip fungus is found. These are knovn as anthracnosc spots. Tear staining and red pitting of the fruit may be prevented by frequent spraying with lime-sulphur or Bordeaux mixture. 47. Damping Off.—Young seedling citrus trees in the nursery are often affected by a disease known as dam]3ing off. This disease is caused by a fungus that is in the soil. The effect of this fungus, if it is present, may be seen on the seedlings a few days after germination. The point of attack is just below the surface of the ground. The tissues of the seedlings collapse at the surface of the ground and they fall prostrate on the ground. The disease may be prevented by not allowing the soil to become too wet and by keeping the surface of the soil stirred. The seedlings should stand far enough apart in the seed-bed in order that air may circulate freely among the plan

Parole chiave associate all'immagine

• bookcentury1900
• booksubjectcitrusfruits
• booksubjectfruitcultur