98 Eepout of the Horticulturist of the^ 
water, applied to the tops of a plat of potatoes on July 7, destroyed a 
portion, but not all, of the larvae. Doubling the amount of the poison, 
however, the application proved almost entirely effective. 
2. London purple. 
This poison, used at the same rates as the Paris green, proved about 
equally effective. As it is considerably cheaper than the latter, the 
cost of the application is somewhat less, but as so little of the poison 
is used in either case, the difference in the expense is slight. 
9 
3. Zoe/rtein poison. 
An insecticide, bearing the above name, was received from the 
" Zoektein Company," of Albany, with the request to try it for various 
insects. It is a pale yellow .powder, partially soluble in water, and 
was found, on test, to be an arsenite. On July 7, it was tested for the 
potato beetle larvae, at the rate of one-fourth of an ounce to five gal- 
lons of water, and was found to be more effective than either Paris 
green or London purple, at the same rate of dilution. On doubling 
the proportion of the poison, the destruction of the insects was com- 
plete, while no apparent injury to the foliage followed. The exact 
composition of this insecticide, and the price at which it is sold, were 
not stated by the party sending it. 
A trial of the same for the coddling moth is reported farther on. 
4. Hose's Tobacco Soap. 
This insecticide, though found effective for destroying insects in the 
green-house, had no effect on the larvae of the potato beetle. 
Applications foe the Codling Moth. 
1. McDougaWs Sheep Dip. 
A package bearing the above name was sent to the station by E. 
Jerome Woodford, West Candor, N. Y., with the request that it be 
tested for insects infesting fruit trees. It is a dark brown liquor, 
having a powerful odor resembling that of coal tar, and appeared very 
similar to, if not identical with, a preparation received from another 
source in 1884 under the name of Little's Soluble Phenyle. It is very 
readily soluble in water, forming a milky white solution. It is not 
claimed to be an active poison, and its value' as an insecticide, if any, 
lies in its slight caustic properties and its powerful odor. 
A thorough test was made with this prejiaration for the codling 
moth, in order to discover if this insect might not be repelled by its 
odor. If such proved to be the case, it would have the advantage 
over Paris green in being practically non-poisonous; hence no injury 
