Plant Diseases and Insects. 117 



40 grains of arsenic. Estimating that the fruit— about six 

 quarts— had received one-tenth of the spray distributed, or 

 about four grains, and that one-half of the amount of the 

 spray would have been equally effectual, and accepting two 



data that upwards of twelve quarts of the ripe fruit would 



No. 18, Iowa A%-°Exp. ' Sta. ' AugTst, ^892* 



Protection /row the Cabbage Jfa^o/.— In the Eighth Annual 

 Report of the Wisconsin Agricultural Kxperiment Station, for 

 the year 1891, Professor E. S. Goff has presented very suc- 

 cessful results in protecting cabbage and cauliflower plants 

 from the attack of the cabbage-fly, by surrounding the stalk 

 of the plants at their setting with small hexagonal discs of 

 tarred paper, rapidly cut from sheets by means of a tool de- 



article contributed by me to the issue of Gardo 

 January 29, 1893. 



kerosene for the Aphis. —Professor Golf has also 

 Dented with kerosene emulsion for destroying the egg 

 a Phis infesting apple and plum, during the winter, win 

 were no leaves to interim with the distribution of the 

 »cide. The experiments were not successful, for a 

 emulsions of the strength of 20, 25 and 30 per cer 

 US( -'d, it was subsequently found that the sprayings ha 

 to destroy the eggs. Full success, however, was attai 

 a spraying of emulsion containing 13 per cent, of ke 

 ; X p nl 24. j ust as the buds of the apple were begin n i n - t . 



!1 " aphides were hatching from the eggs at this tin 

 they were almost entirely destroyed. This, therefor 

 '"' ■•"■cepted as the most vulnerable period in the life 

 insect. (See the report above cited.) 



XoafsuJs for the Cabbage Afhis. -Kerosene emulsi 

 been recommended for killing the plant-lice that often ( 

 gate in immense numbers on the leaves of cabbage, bu 



