Fungous diseases of plants . 1892 Peach Mildew. Colo. Agl. Exp. Sta. Built. 107: 1-7. pis. This mildew bears the relation to the peach that PodospJucraleucotricha bears to the apple, that is, it is more commonly found on nursery stock, andthen usually only whenthe conditions are moistand the stock crowded,although occasionally itoccurs on mature trees(Figs. 88 and 89). It is as a disease ofcultivated roses that thisfungus is best known,and most destructive. Itis widely distributed andindeed absent from very few home gardens. There is great differ-ence in the susceptibility of different varieti
Fungous diseases of plants . 1892 Peach Mildew. Colo. Agl. Exp. Sta. Built. 107: 1-7. pis. This mildew bears the relation to the peach that PodospJucraleucotricha bears to the apple, that is, it is more commonly found on nursery stock, andthen usually only whenthe conditions are moistand the stock crowded,although occasionally itoccurs on mature trees(Figs. 88 and 89). It is as a disease ofcultivated roses that thisfungus is best known,and most destructive. Itis widely distributed andindeed absent from very few home gardens. There is great differ-ence in the susceptibility of different varieties of the rose, and selec-tion should lead to resistant strains in many cases. The crimsonrambler is notably sensitive. This mildew covers the leaves, especially the young leaves andthe vigorous and young shoots, injuring and often arching orcurling the leaves and deforming the more succulent oidial stage is produced in great profusion, and consequentlythe disease spreads rapidly. Perithecia are not always Fig. 89. Mildew on Peaches ASCOMYCETES ?25 Following a moist early summer I have found the perithecia abun-dant on old leaves in the shade during a very dry period in latesummer (Fig. 90). Control. Thorough dusting with flowers of sulfur every ten daysis often sufficient. Ammoniacal copper carbonate is also effective.
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