. Manual of fruit diseases . Fruit. RASPBERRY DISEASES 413 blight no Insect burrows are found. The disease has also been confounded with drought and winter-injury. Drought- injured canes dry up slowly and more uniformly; blighted canes die suddenly. AVintcr-injured canes do not put out new leaves on the aiiected portion; blighted canes develop new leaves on the affected parts. The berries dry up as a result of cane- wilt (Fig. 120). They are also susceptible to direct attack. This is evidenced by the fact that a single berry in a cluster, or even one side of a berry, may be dis- eased. The nor
. Manual of fruit diseases . Fruit. RASPBERRY DISEASES 413 blight no Insect burrows are found. The disease has also been confounded with drought and winter-injury. Drought- injured canes dry up slowly and more uniformly; blighted canes die suddenly. AVintcr-injured canes do not put out new leaves on the aiiected portion; blighted canes develop new leaves on the affected parts. The berries dry up as a result of cane- wilt (Fig. 120). They are also susceptible to direct attack. This is evidenced by the fact that a single berry in a cluster, or even one side of a berry, may be dis- eased. The normal green color is slightly tinted as if ripening prematurely; fi- nally, the tissues gradually turn brown and a dry rot results. Cause. The brown mass of reproductive bod- ies, already mentioned, which ooze out on the affected bark are the conidia of the causal fungus, Leptospharia Con- iothyriiim. These spores are dissem- inated from plant to plant probably by insects (tree crickets), wind and dashing rain, by pickers, pruners and cultivating tools. The spores germinate on the canes, and evidently the germtubes are capable of penetrating the un- broken epidermis of the canes. The fungus also enters tlie canes through wounds; stubs left exposed in heading-back and injuries made by the snowy tree cricket {CEcanihiis niveiis) are common points of entrance. Berry-infection doubtless occurs through the flowers and very young fruit. The mycelium works between and within the fleshy parts of the drupelets, but not in the embryo or stony part. It passes from the fruit down the pedicels and thence upward to other berries of. Fig. 121. —Cane-blight; fruit bodies of the patho- geue on raspberry Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hesler, L. R. (Lexemuel Ray); Whetzel, Herbert Hice, 1877-1944. New
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