EXPERIMENT STATION BULLETINS. 319 



strong enough to kill the insects. This remedy is recommended for the 

 apple aphis, bark lice, scale, and all similar insects. 



PYEETHRUM OE BUHACK. 



In some cases, it is not practicable to apply either arsenites or kerosene 

 emulsion, as on cabbages for the cabbage worm. For such insects, the 

 the insect powder known as pyrethrum or buhack, may be used, either in 

 a dry form, or with water at the rate of a heaping teaspoonful to the gal- 

 lon. This remedy, like kerosene emulsion, kills by contact, and, as its 

 effects are not lasting, should be repeated if other insects appear on the 

 plants. 



CAEBOLIZED PLASTEE. 



For the plum curculio, the carbolized plaster has been used with success, 

 but, as the arsenites prove fully as effectual, and are easier to apply, its use 

 has not become very common. Where one has no spraying outfit, and 

 only a few trees, the remedy is a valuable one. 



The insecticide is prepared by mixing one pint of carbolic acid with 50 lbs. 

 of land plaster. This can be thrown over small trees, while the dew is on, 

 at the time the blossoms fall and at intervals of ten days or two weeks for 

 a month thereafter. 



TEEE WASHES. 



For washing the trunks of trees to repel the attacks of borers, and to 

 destroy such insects as may be upon them, the carbolic acid and kerosene 

 emulsion is excellent. The kerosene emulsion is made exactly as for any 

 other purpose, except that one quart of soft soap should be substituted for 

 the hard soap, and, without the final dilution, one pint of crude carbolic 

 acid of good strength should be added. 



When scale insects are on the larger branches, they can be easily 

 destroyed by this wash. The emulsion will consist of one quart soft soap, 

 1 pint kerosene, and 2 quarts water, to which 1 pint of carbolic acid is 

 added. 



Other tree washes contain, instead of kerosene, lime, sulphur, or arsenites, 

 but they are less reliable than the one given above. Where borers are 

 troublesome, however, the addition of a small amount of Paris green to the 

 kerosene wash will render it more lasting in its effects. 



We append brief descriptions of some of the more 



INJURIOUS INSECTS. 



In order to so apply our remedies as to produce the best results, some 

 knowledge of the habits and characteristics of our enemies should be pos- 

 sessed, and to afford a slight insight into the structure and methods of 

 securing their food, we give short notes concerning a few of the more com- 

 mon of our injurious insects, selecting those that readily yield to treatment. 



CODLIN MOTH. 



This insect, more commonly known as the apple worm, has for many 



