ILLUSTRATIONS 



Plate I 



Fig. 1. Leaf spot of sorghum caused by Phyllachora sorghi v. HohneL 



2. Rust of sorghum caused by Puccinia purpurea Cooke. 



3. Kernel smut of sorghum caused by Ustilago sorghi (Lk. ) Pass. 



Plate II 



Fig. 1. Leaf spot of pechay caused by Cercospora brassicicola Henn. 



2. Leaf spot of pechay caused by Cercospora brassicicola Henn. 



3. Leaf spot of chard caused by Cercospora. 



Plate III 

 Fig. 1. Mottled leaf of Citrus. 



2. Citrus canker on leaves of Citrtis. 



3. Citrus canker. On leaves of Citrus maxima (Burm.) Merr. {Ci- 



trus decumana Linn.), showing spread of the disease by a leaf 

 miner, which is the larva of the moth PhyUocnistis citrella 



Stainton. 



Plate IV 



Fig. 1. Citrus canker. Stem canker on Citrus. 



2. Citrus canker. Fruit and stem of Citrus. 



3. Citrus canker. Fruit of Cit'nis maxima (Burm.) Merr. (C. dec- 



timana Linn.). 



Plate V 



Fig. 1. Coconut bud rot. Old infection. Entire central group of leaves 

 killed and some fallen over. 



2. Coconut bud rot. Central leaves killed and some fallen over. Outer 



older leaves healthy. 



3. Coconut bud rot. Diseased central bud fallen over. 



Plate VI 



Fig. 1. Coconut bud rot. Young infection, showing unfolded tips of leaves 

 just starting with the attack. From this point the disease ad- 

 vances downward into the growing point and more woody portion. 



2. Coconut bud rot. Old infection. Entire cabbage and growing 



point softened. 



3. Coconut bud rot. Old infection. Rotted portion just above growing 



point. 



4. Coconut bud rot. Old infection. Characteristic brownish stripe, 



showing limits of infection in the wood. 



5. Coconut but rot. Inoculated seedling, showing diseased portion. 



Three days after inoculation. 



6. Coconut bud rot. Typical case of infection produced in seedling 



three days after inoculating with a pure culture of bacteria 

 isolated from a bud rot tree. Entire growing point and sur- 

 rounding tissue rotted. 



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