8o 



THE APPLE LEAF HOPPER 



We insert this here, a very brief summary of a most excellent 

 and exhaustive report made by Prof. Ball at the Nineteenth Annual 

 Meeting of the Association of Economic Entomologists, held in New 

 York City in December, 1906, since it is a new and radical departure 

 from previous work in spraying for the Codling Moth, and gives 

 spraying an entirely different aspect. Mr. Ball's findings are to be 

 regarded as of great practical value to fruit growers who have only 

 the Codling Moth evil to contend with. In this state where the Plum 

 Curculio is a greater foe to the apple than the above named insect, 

 we have to resort to a different and more expensive treatment. See 

 article on "Spraying for the Plum Curculio." 



Fig. 30. Apple leaves (sprayed with Bordeaux and Paris green) three weeks and 

 three days after application. Bordeaux still showing but no trace of arsenic upon chem- 

 ical analysis, OriKlnal. 



Dust VS. Liquid Sprays. 

 During both 1907 and 1908 most careful consideration has been 

 given to the comparative merits of liquid and dust sprays for use in 

 the orchard. These tests were undertaken without prejudice in either 

 direction. The north portion of the Russian Orchard at the Experi- 

 ment Station, was treated five times with liquid Bordeaux and Paris 

 green, using eight ounces of the latter in every fifty gallons of Bor- 

 deaux. The middle portion of the orchard was left unspraved as a 

 check, and sixty trees on the south end were given a treatment with 



