12 Fig " Canker" caused hy Phoma cinerescens Sacc. 



which should be employed — and these will be no less important than 

 the direct measures — must consist of the prevention as far as possible 

 of wounds to the bark. The making of wounds by the boots of men 

 climbing in the branches when gathering the figs must be rigorously 

 prevented, as well as those caused by careless hoeing or digging round 

 the trees or due to the attacks of animals. The minimum amount 

 of pruning to the older branches should be employed until the disease 

 has been stamped out or reduced to a small amount. 



DESCRIPTION OF PLATES I, II 



PLATE I 



1. Canker on a large branch of a fig-tree. | natural size. 



2. Lower half of the same canker, natural size, showing the small wart-like protu- 

 berances produced by the pycnidia. 



3. Section through the bark of a canker; the pycnidial form of the fructifications 

 is evident, x 60. 



PLATE II 



4. Portion of a canker with "tendrils." x4. 



5. Transverse section, natural size, through the middle of the canker shown in Fig. 1 ; 

 the affected tissues were dark brown in colour. 



6. Phoma cinerescens in pure culture on sterilized potato, natural size. 



7. Two "tendrils" of Phoma cinerescens produced in pure culture on a slice of sterilized 

 fig wood. X 4, 



8. Branch of fig-tree after inoculation with conidia taken from a pure culture, natural 

 size; an irregular ring of "tendrUs" at some distance from the wound is shown. 



9. Another branch after inoculation with conidia; the protuberances produced by 

 the pycnidia are seen around the woimd. 



10. A camera-lucida drawing of conidia of Phoma cinerescens; each conidium is 

 provided with two groups of guttules. x 1000. 



11. Drawing traced from Mr Massee's illustrations, in the Gardener i Magazine, of 

 the conidia of the Fig canker Libertella. x 500. 



