20 STATE HORTICULTURAL SOCIETY. 



lY. ]!:Tewly cleared timber land should be cultivated in corn or 

 other crop for two years before the apple trees are set out in order to 

 kill the wooly-aphis that may be on the roots of the wild crab and 

 allied trees. 



Y. Apple nursery stock should have the roots cleaned and dipped 

 for a minute in strong kerosene emulsion in order to kill the wooly- 

 aphis that may be there. 



YI. In planting apple trees tobacco dust should be freely used 

 among and over all the roots and close around the trunk in order ta 

 kill and prevent. the wooly-aphis from establishing itself there. 



YII. Every spring, as soon as settled warm weather appears,- 

 each tree should have a liberal supply of tobacco dust applied to its 

 roots by removing the earth from around the trunk for a distance of 

 two feet and four inches in depth, evenly filling this with the tobacco 

 dust and covering it with earth. 



YlIK The root form of the wooly-aphis may be cheaply and 

 easily killed and kept away from an apple tree by the liberal use of 

 tobacco dust. About five or six pounds of this substance should be 

 applied as above directed to the roots of every infested tree, and one> 

 half this amount should be applied in a similar manner each succeed- 

 ing spring. Costing approximately two cents per tree per year. 



IX. This insect may also be killed by injecting one fluid ounce 

 of carbon bisulphide two feet away from the trunk on two sides of the 

 tree, but the use of this substance is not advised except in extreme 

 cases, since a little carelessness may injure the tree, and it is always 

 necessary to immediately treat the trees with tobacco dust in order to 

 keep the insect away. 



GENERAL REMARKS. 



The apple-root plant-louse, or wooly-aphis, as it is called through- 

 out Missouri, causes little trouble in the apple growing sections of the 

 northern half of this State, but in the southern half of Missouri it is 

 believed that it does more injury to the apple orchards and apple 

 nursery stock than any other insect now infesting that region. Judge 

 W. R. Wilkinson, a prominent orchardist and a member of the State 

 Board of Agriculture and of the State Horticultural Society, states in 

 the January, 1897, number of "The Southwest" of Springfield, Mis- 

 souri, the following : "I consider the wooly-aphis the most destructive 

 insect that the apple grower of South Missouri has to contend with, 

 HUd is killing and destroying more trees in this section than all other 

 causes combined." 



Since the southern half of Missouri is largely devoted to fruit in- 

 terests and is now known throughout the United States as "the home 



