H. WORMALD 59 



(7) Frank, P.. uinl KrCckk, F. Ubor die gegcii\v;ir(ig lii'rrsohonde Monilia- 



Epidemiedtn- Ohsthiinmc. iMndirirlsrhaJtlirhe .Jdlnf/nrher, Bd. xxviil, pp. 185- 



216, 1899. 

 (S) Grossenbacher, J. G. and DrnoAR, B. M. A Contribution to tlic I.ife-lii.^torv, 



Parasitism, and Biolog}' of Botri/osphoeria liihi'i. Xcic Yorf: Ayric. Kxpt. Sla. 



Tech. Bull. No. 18, .Tuly 1911. 

 (9) Waro, H. Marshall. Recent Researches on the Parasitism of Fungi. Aiin. 



Bot. vol. XIX, Jan. 1905. (A historical account of work on Specialized Para- 

 sitism to that date is given on pp. 14-18.) 

 (10) Wormali), H. a Blossom Wilt and Canker of Apple 1 rees. Amml.'i of Applied 



BInlnijt/, vol. Ill, Xo. 4, April 1917, pp. 159-204. (References to other papers 



on Moiiilia diseases are given in the Bibliography.) 

 (U) The "Blossom Wilt and Canker"' Disease of Apple Trees. Jonrn. Board 



of Agric. vol. xxiV; Xo. 5, August 1917. 

 (12) WoRONiN, ]\I. tJber Sclerotinia cinerea und Schrolivia fnicligena. Mem. Acad. 



Imp. 8ci. St Petershoury, VIII Series, vol. X, No. 5. Phys. Math. pp. 1-38, Oct. 



1899. 



DESCRIPTION OF PLATES VII-IX. 



Fig. 1. A typical instance of '"Wither Tip." Infection arose in the leaf on the left and, 



extending into the shoot, caused the wilting of the terminal portion. 

 Fig. 2. In this case infection had occurred in two places; the apical portion is withered 



from infection throuah one of the upper leaves; a later attack originated in the second 



leaf from below, where a drop of gum is seen at the base of the affected leaf. 

 Fig. 3. The death of the leading shoot has resulted in the outgrowth of two weak shoots 



with small pale leaves. 

 Fig. 4. The "withered tips" as seen in winter and spring (photographed March 18. 1917); 



remains of dead leaves still present and Monilia pustules have appeared. 

 Fig. 5. The plum on the right was inoculated on June 26 with conidia of a "wither tip" 



.strain of Monilia cinerea. Result on July 11 — the inoculated plum is covered with 



pustules of the fungus and the rot has extended into the other plum in contact with it; 



the pad of mycelium connecting the two is seen. 

 Fig. G. A group of five plums with Monilia cinerea. One of these plums was inoculated on 



June 26 ; the rot gradually extended through it and infected the rest. Result on July 21 



— all were infected and bore pustules of the fungus. 

 Fig. 7. The upper flower was inoculated with conidia on May 14. Result on May 19 — 



style discoloured for 3 mm. 

 Fig. 8. The same on May 2 1 : •tyle brown to base. 

 Fig. 9. The same on May 23: calyx lobes withered and recurved; stamens collapsed 



