352 



STATE BOARD OF AGRICULTURE. 



use Bordeaux mixture, the first application of this spray to be used just before 

 blossoming. This is the most important treatment of the season. The second 

 after the blossoms fall and two or three other applications at intervals of ten 

 days to two weeks will prove beneficial, especially if the season is a wet one. 

 The final spray may consist of the weak solution of copper sulphate B to avoid 

 staining the fruit. 



BITTER ROT, RITE ROT, AXTHRACNOSE. 



(Glomerella rufomaculans Von Schrank & Spalding.) 



Fig. 4. — An apple decaying with the bitter rot fungus, tlie affected portion showing pinkish spore 



pustules. 



<:^ 



^A^.,. 



/? V 





ff- 



-or 



/ 



'^(J 

 '^^ 



Fig. 5. — Microscopic structure of the bitter rot fungus. A, section through the affected part of an 

 apple. The mycelium of the fungus liiis formed a mass of spore bearing stalks (conidiophores) 

 which have ruptured the epidermis of the fruit, and formed a pustule from which numerous sum- 

 mer spores (conidia) are being given off; A, cuticle of apple; d. spores; B, spores (conidia) more 

 highly magnified; C, spores germinating in water. Two of them have become divided (septate), 

 and one has formed .secondary spores, c, on the germ tubes; D, section of an old affected apple, 

 showing the permanent winter stage of the fungus; d, cells of the apple on which is seated the 

 thick walled spore ca.se (nerlthecium), f, in which young spore sacs (asci), are forming; e, my- 

 celial threads among which are scattered some two celled spores (conidia); E, a mature spore sac, 

 (ascus). containing eight spores (ascospores). All highly magnified. (D, E, after Burrill, the others 

 original.) 



