424 Keport of the IIokticuetukist of the 



are nearly black iu color. Like other species of plant lice they 

 multiply with great rapidity, soon covering the under sides of the 

 leaves and causing them to curl and wilt. The lice prefer the 

 young leaves at the tips of the branches, and will be found there 

 in greatest numbers. 



Treatment. — Where practical cut off and burn tlie ends of the 

 twigs bearing the young and worst infested leaves. The trees 

 should then be sprayed with whale oil soap solution or kerosene 

 emulsion as recommended for the apple plant louse, page 415. 



SLUG. 



This insect also infests pear trees. It is discussed more fully 

 under the heading " Pear slug " on page 451. The remedies to 

 be used are there given. 



CUERANT DISEASES. 



leap spot. 



(Septoria rihis Desm. and Cercospora angulata Wint.) 



These two fungous diseases which cause sjDotting of currant 

 leaves have been successfully treated with Bordeaux mixture by 

 Pammel.^^ The spot diseases are usually seen to some, extent 

 each season, and in some cases their attacks are so severe as to 

 nearly defoliate the bushes. Judging from the experiments thus 

 far tried, the spraying should begin soon after the fruit sets, and 

 continue at intervals of about two weeks until the fruit begins to 

 color. One or two applications may be m'ade after the fruit is 

 harvested if thought necessary. One objection to the treatments 

 before the fruit ripens is that the mixture is liable to remain on 

 the fruit and injure its appearance when ripe. 



Goff^^ has recently reported excellent results from a single 

 thorough spraying with Bordeaux mixture made during the first 

 week in Julv, after the fruit was harvested. 



2iPammel, L. H. Iowa A^^r. Exp. Sta. Bui. 13: 45-4G; Bui. 17: 419-421; 

 Bui. 20: 716-718; Bui. 30: 289-291. 



22Goff, E. S. Wis. Agr. Exp. Sta. Bui. 72: 30. 



