DISEASES OF PLANTS. 659 



experiments with various sprays and washes resin wash, resin com- 

 pound, an emulsion of pyrethrum and kerosene, and a resin wash con- 

 taining a tobacco decoction proved very effective. Fumigation with 

 hydrocyanic acid gas has also given excellent results. The treatment 

 for sooty mold should be made during winter, in May, and in August or 

 the early part of September. The trees should be given 2 or 3 spray- 

 ings during the winter and 1 in May, another application being made 

 during August if the fungus is found to be spreading to the fruit. 



Several entomogenous fungi have been discovered which will prob- 

 ably greatly aid in holding in check the sooty mold and the pests which 

 it follows. The first of these (Asehersonia aleyrodis, n. sp.) is parasitic 

 on the larva- and pupae of the mealy wing, and has been found very 

 abundant in many groves infested with sooty molds. Only the larvae 

 and pupa- are subject to attack, infection taking place most commonly 

 in the young larva'. The fungus is fully described and its life history 

 well worked out. A second fungus parasite, to which the name "brown 

 fungus of the mealy wing" has been given, gives evidence of being 

 more effective in its attack than the previous one. The relationships 

 of the fungus can not be given, no fruiting bodies having been found. 

 In the grove where this fungus was first discovered its spread was so 

 rapid during the summer that the mealy wing was almost wholly eradi- 

 cated. 



Notes are given of other fungi which attack scale insects on several 

 other plants. 



A seedling disease of cacti (Mnnaisschr. Kakteenkunde, ? {1897), Xo. 12,p.l8S). — 

 A brief not<' is given of 'a disease of cactus seedlings. Examinations of material 

 revealed the presence of a sterile mycelium that is thought to be the cause of the 

 disease. 



A disease of the mammoth tree of California (Median's Mo. , 7 (1897), No. 12, p. 

 $30). — A note is given of Cercospora sequoia', which is said to seriously interfere with 

 the growth of Sequoia gigantea in the eastern States. 



A new disease of cauliflowers (Jour. Agr. and Ind., South Australia, 1 (1897), Xo. 

 4, p. 343).— A brief note is given of a disease of roots of cauliflowers, due to a spe- 

 cies of Phoma. 



A disease of clematis, P. Sorauer (Ztschr. Pflanzenkrank., 7 (1S97), Xo. 4, pp. 

 255,256). — A brief note is given of a disease of Clematis jackmanni, which is caused 

 liy Glocosporium clematidis. 



A sclerotium disease of tulip bulbs, F. Ludwig (Deut. Bot. Monatsschr., 15 (1897), 

 No. ■', pp. 153, 154). 



A new leaf disease of coffee in East Africa, P. Hennings (Ztschr. Trap. Landw., 

 1 (1897), No. 8, pp. 192, 193). — Describes Hemileia woodii. 



The diseases of fruit trees, C. Bach ( Wchnbl. Landw. Ver. Baden, 1897, p. 84). 



The gummy deposits in the sereh disease of sugar cane, A. Wieler (Beitr. 

 Wiss. Bot., 2. Alt., 1 (1897), pp. 29-140, ph 1, Jigs. 23). 



New fungi parasitic on cultivated plants, G. Pollacci (Atti Inst. Bot. Univ. 

 I'aria, 2. ser., vol. 5, pp.8; abs. in Bot. Ccntbl., 72 (1897), Xo. 5, pp. 184, 185).— The fol- 

 lowing new species are described: Maerosporium viola, Helminthosporium iberidis, H. 

 lunariw, Leptothyriumparasiticum, Cytosporella cerei, Pirostoma farnetianum, zmdPhyl- 

 losticta dammar as. 



13039— No. 7 5 



