54 State Horticultural Society. 



Tobacco." This substance can be diluted with water in the proportion 

 of I to 40, and will destroy ordinary soft-bodied sucking insects, such 

 as plant lice, etc. 



'My reason for advising you to use arsenate of lead instead of Paris 

 green, or London purple, is that, in addition to the superiority of the 

 arsenate of lead, both these substances are adulterated to a great extent 

 throughout this State, so much so that they cannot be relied upon to give 

 satisfactory results. Pure Paris green is really an excellent insecticide, 

 but }ou cannot ordinarily obtain it in that condition. London purple 

 is a substance made from the manufacture of analine dyes, and its compo- 

 sition varies wonderfully from day to day even from the same manufactory 

 Hence it is thoroughly unreliable. Scheele's green is another arsenical 

 poison that can be relied upon to a greater extent, but, unfortunately, is 

 not found in the ordinary markets in this country. It can be obtained, 

 however, by making a special order to Chicago, St. Louis or New York 

 firms. It has the advantage over Paris green and London purple in that 

 it remains suspended in water twenty-four times as long, but does not 

 stay suspended as long as the arsenate of lead. 



London purple, Paris green, and Scheele's green should be used in 

 the following strength : One pound of the poison and 3 pounds of 

 fresh stone lime to every 50 to 175 gallons of water, according to the 

 plant to be sprayed and the insect to be killed. The lime must not 

 be forgotten, otherwise there will be great danger of burning the leaves 

 and ruining the plant or the fruit. Such a thing as this, however, will 

 not occur with the use of arsenate of lead, which has never been known 

 to injure the leaves of any plant except occassionally a peach tree. Hence 

 you can see another excellent reason why arsenate of lead is preferable 

 to all other arsenical poisons for biting insects. 



Judging from the correspondence received at my office from various 

 parts of the State, I find that the following are the more troublesome 

 orchard insects at the present time, and I will confine my remarks to these 

 insects. 



The Lcaf-Crumplcr seems to be doing more damage at present than 

 it has done for the past ten years, and it is on the increase. This insect 

 is easily detected during the winter by the presence of dried, crumpled 

 leaves, fastened in bunches to the twigs of the various fruit trees. In some 

 instances it has become quite conspicuous by the great number of these 

 crumpled leaves which remain on the trees all winter. Tf you will take 

 the trouble to open these crumpled leaves you will lind inside a cornu- 

 copia-shaped case fastened to the twig, and inside of this case a hiber- 

 nating larva which is about two-thirds grown. In the spring of the year 



