Fungi And Fungicides: a Practical Manual, Concerning the Fungous Diseases of ...
Fungi And Fungicides: a Practical Manual, Concerning the Fungous Diseases of ...
Clarence Moores Weed
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o. Under surface of blackberry leaf showing spots of secidium stage; 5, same of raspberry leaf showing both secldium and Pucclnla spots. spring, affected leayes having a peculiar golden color, which at once distinguishes them. A little later the surface becomes more or less covered with small round patches of orange-colored spores, to which the common name is due. The life-history of the fungus has only recently been definitely worked out. The fungus exists on the blackberry plant in two very d...ifferent stages. The orange spores that are devel- oped in spring and early summer, as shown in Fig. 48, belong to the CBcidium stage. They germinate on the Digitized by VjOOQ IC 102 FUNGI AND FUNGICIDES leayes of raspberry and blackberry; the germinating tubes enter the stomata, or breathing pores, of the leaf, develop a mycelium inside, and finally produce on the surface the spores of the teleuto stage, which has here- tofore been considered an entirely different fungus, called by botanists Puccinia peckiana.
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