TOMATO BLACK ROT 325 



of closely packed, dark-coloured conidiophores, each bear- 

 ing a dark, many-celled conidium at its tip. 



When mature, the conidia germinate quickly in water, 

 each cell of the spore producing a germ-tube capable of 

 inoculating a tomato if placed on a wounded surface. The 

 present fungus is suspected of being a condition of some 

 higher form, but this has not yet been definitely proved. 



PREVENTIVE MEANS. Thorough spraying with potassium 

 sulphide solution at frequent intervals. All diseased parts 

 should be cleared away and burned, otherwise they con- 

 tinue to grow on shrivelled fruit, stems, and leaves. The 

 use of green stable manure is considered to favour the 

 disease, and also causes the fruit to crack, thus rendering 

 it susceptible to a high degree. 



Smith, Card. Chron., Oct. i, 1887, fig. 89. 



Plowright, Gard. Chron., Nov. 12, 1881, figs. 118, 119, 



122. 



Galloway, Ann. Rep. U.S. Dept. Agric., 1888, p. 339, 

 pi. iii. 



IRIS BULB SCAB 



(Mystrosporium adustum, Massee.) 



Bulbs of Iris reticulata are frequently destroyed by a 

 fungus which forms black crustaceous patches on the 

 outer sheath, the hyphae gradually extending to every 

 part. The conidia are very large, dark brown, and divided 

 into a number of cells by cross-walls or septa. 



PREVENTIVE MEANS. If only slightly attacked, soaking 

 the bulbs for two hours in a solution of one part of formalin 

 to three hundred parts water will destroy the fungus before 

 it enters the deeper parts of the bulb. 



