Fungous diseases of plants . Fig. I Peach Scau on White-fleshed Fruit This fungus is responsible for the well-known peach scab, adisease common throughout the country on peaches, and also onapricots. It forms, as a rule, numeroussmall, circular, sooty spots, sometimesconfined to one portion of the fruit andat other times scattered over the wholesurface. It is so common upon thepoorer grade of market fruit that dur-ing an ordinary season practically noneof the second or third quality fruit, es-pecially that with white pulp, is freefrom it. The spots may become scabbyin form, and coalesced into
Fungous diseases of plants . Fig. I Peach Scau on White-fleshed Fruit This fungus is responsible for the well-known peach scab, adisease common throughout the country on peaches, and also onapricots. It forms, as a rule, numeroussmall, circular, sooty spots, sometimesconfined to one portion of the fruit andat other times scattered over the wholesurface. It is so common upon thepoorer grade of market fruit that dur-ing an ordinary season practically noneof the second or third quality fruit, es-pecially that with white pulp, is freefrom it. The spots may become scabbyin form, and coalesced into large irreg-ular areas, and as a result of the injurysevere cracking of the fruit may occur(Fig. 133). Twigs and leaves may alsobecome affected. On the latter distinctspots are produced, often accompaniedby the falling out of the affected areas, as with many other fungi, thus leaving ^ , , 1 rr /^ 1 • 1 Fig. 134. Cladospqrwm a shot-hole enect. (Jn the twigs the carpophilum. lOO FUNGOUS DISEASES OF PLANTS fungus may be perennial in brown or purplish-brown spots, andfrom such areas the conidial stage of the fungus is produced thefollowing spring. The fungus, shown in Fig. 134, is known only bythe conidial stage, and the latter is developed throughout the artificial culture this Cladosporium grows readily, producing adense olive-black mycelium, with somewhat abnormal conidiophoresand conidia, but no other stage has been reported in such cultures. XII. CLADOSPORIUM: OTHER SPECIES Cladosporium Cucumerinum Ell. and Arth. This fungus, likemany other species of the genus, is occasionally parasitic. It occurs upon melons, producingsunken spots on the fruit,and sometimes on thestems. This trouble is ap-parent, as a rule, only dur-ing very moist weather,and under such circum-stances the conidial stageof the fungus is developedabundantly over the af-fected areas, which ap-pear olivaceous in color (Fig- 135). Cladosporium fulvumCke. Leaf mold of tomato. Thi
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