259 



THE SCUEFY BARK LOUSE. 



The Scurfy Bark-louse, Cliionaspis furfunis, was very abundant in the 

 college orchard last fall. In the spring kerosene emulsion and rosin 

 mixture, the latter prepared according to the formula given by Mr. D. 

 W. Coquillett in the Report of the Department of Agriculture for 1888, 

 were used to test their effects upon the scales and the newly hatched 

 lice. The application did not destroy the eggs beneath the scales, but 

 when applied to the newly hatched lice both were very effectual in de- 

 stroying them. Two lady birds, Chilocorus bivulnerus and Hyperaspidius 

 sp.^ were constantly preying upon the scales in large numbers. 



EXPERIMENTS WITH THE ARSENITES. 



The experiments with the arsenites were so fully reported in Bulletin 

 10 of the Experiment Station that I will only call attention to them here, 

 and state that several applications of London purple and of Paris 

 green in lime water and in Bordeaux mixture have been made upon 

 tender foliage since the experiments reported in Bulletin 10 and with 

 the same results. 



CUT-WORM PARASITES. 



The following parasites have been bred from cut-worms the past 

 year : three species of Tachina flies, one species of Anthrax, A. scrobicu- 

 lariaf, determined by Dr. Riley; Ichneumon ivilsoni, determined by Dr. 

 'R\ley,Lampronota americana, Rhogas rileyi, Apanteles xylince, determined 

 by Dr. Riley, Liothorax melanocera, determined by Mr. Ashmead, and 

 a species of Ichneumon not yet determined. 



INSECT DISEASES. 



The larvse of Nephelodes violan and of Pieris rapce have been very 

 largely destroyed at Ames, Iowa, the past year by bacterial diseases. 

 Diseased larvai of Danais archippus and of Plusia brassicce were also 

 seen. 



THE POTATO STALK- WEEVIL. 



The Potato Stalk- weevil, Trichobaris trinotata- has been extremely 

 abundant in central and eastern Iowa, at least the past summer. Xo 

 patches could be found that had not suffered from a severeattack, and 

 in gardens nearly every potato stalk was infested. 



PYRETHRUM EXPERIMENTS. 



Two years ago I put a small quantity of pyrethrum in an open box 

 ana covered it with cheese cloth, and this box has been left exposed ever 

 since. This fall I used the old pyrethrum alongside of afresh article 

 to determine their comparative effects for the destruction of the cab- 



