12 
Fia. 21. 
Fie. 22. 
Fia. 23. 
Fic. 24. 
Fie. 25. 
Fia. 26. 
Fia. 27. 
DISEASES OF GLASSHOUSE PLANTS 
Botrytis stem rot of the anes seatarea a aes pisaons at (a) 
and (6) - - = 
Spores of Cercospora melonis - - - - é 
Cucumber ‘‘ leaf spot”? caused by Colletotrichum oligocheetum - 
Colletotrichum oligochetum growing on cotton wool, straw and wood 
Powdery mildew of the cucumber - - = 3 = 
Tomato ‘“ mildew ’’ caused by Cladosporium fulvuum, showing the 
fungal masses on the underside of the leaf - - es 
(a) Rust of the carnation ; (6) uredo-spore ; (c) teleuto-spore ; 
(d) spore mass ; (e) stigmonose of the carnation - - é 
Fias. 28 and 29. Chrysanthemum rust, showing the dark spore masses - 
Fria. 30. 
Fia. 31. 
Fia. 32. 
Fic. 33. 
Fia. 33a. 
Fig. 34. 
Fie. 35. 
Fia. 36. 
Fic. 37. 
Fia. 38. 
Fie. 39. 
Fia. 40. 
Fic. 41. 
Fia. 42. 
Fia. 43. 
Fie. 44. 
Fra. 45. 
Fria. 46. 
Pia. 47. 
Septoria leaf spot of the Syne: (@) diseased leaf; (b) a 
pycnidium ; (c) spores - = F = 
Powdery mildew of the rose: (a) diseased leaves ; (b) summer 
spores ; (c) a perithecium ; (d) ascus containing eight asco-spores 
Rose leaf blotch: (a) diseased leaf; (6) spore cluster ; (c) spores 
“ Buckeye ” rot of tomato fruit’ - - - = 2 
*¢ Foot rot ’’ of the melon due to Bacillus carotovorus: (a) inoculated 
plant; (b) control - - - - - - js 
Gummosis of the cucumber caused by Cladosporium cucumerinum : 
(a) leaf lesions ; (b) fruit lesions ; (c) hyphz and spores ; (d) spores 
Typical appearance of bacteria pathogenic to plants - = 
“ Dieback ”’ of the carnation caused by Fusarium sp: - “ 
“ Streak ’? disease of the pea - - - - = 
Arum disease caused by Bacillus carotovorus, showing diseased 
corm and roots ° - - - S < = 
Mosaic disease of the tomato - - - ~ c 
Mosaic disease of the cucumber, showing the distorted leaves - 
‘Box and grid ” for steam sterilization - - - - 
Steam sterilization by the small grid method: (a) diagram show- 
ing apparatus in position ; (b) section illustrating the method of 
placing the grid in the trench; (ce) section showing the soil in 
position ready for steaming ; (d) portion of grid showing position 
of the holes ; (e) water trap - - - - - 
Steam boiler - ~ - - - - - - 
Tray method of Pheer BOWES Saye and pipes ready © Ree 
in position - 
Trays down ready for steaming to begin - - 7 ‘4 
Tank method of steaming - - - - - % 
Drain pipe method of steaming - - - ~ = 
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