84 



THE APPLE LEAF HOPPER 



Beside plums, apples are very badly attacked by this insect in 

 Minnesota, and without doubt it is, in many sections, the chief 

 enemy of the apple. When the fruit trees become large, and are 

 placed so closely together, as they are recommended to be in this 

 state, the use of the Curculio catcher is often a more laborious 

 method of attack than in eastern and southern orchards. 



More or less successful spraying experiments have been carried 

 on by the Cornell Experiment Station against the Plum Curculio 

 on plums, while other stations such as Missouri and Illinois, have 



Fig. SS. Plum Ourcullo, adult and early stages; plums showing characteristic 

 markings, with gum exudation. After Lugger. 



carried on similar experiments against this insect on apples. In 

 the interest of Minnesota fruit growers, spraying experiments 

 against the Plum Curculio on plums were begun in 1907, and have 

 been carried on through two seasons. These experiments have 

 been conducted in the plum orchard of the Experiment Station, the 

 use of which was kindly loaned for the purpose by the Horticul- 



