340 Rei>oet of the Department of Entomology of the 



All of the sprays were distinctly repellent at first. On exposure 

 to weather some sprays lost their distasteful or repellent properties 

 much sooner than others. The mixtures containing bordeaux, soap 

 and glue were repellent to the end of the test, covering a period 

 of twenty-five days. As opposed to this the poisons when used 

 alone or with lime-sulphur lost their repellent properties by the 

 end of the period. The loss of the distastefulness of the mixtures 

 that contained lime-sulphur is to be noted as they were the most 

 repellent at the initiation of the test. Lead arsenate and glucose, 

 which was the least repellent of all the combinations used, soon lost 

 its insecticidal properties when the foliage was subjected to the 

 weather. 



SAFENESS OF ZINC ARSENITE FOR USE ON FOLIAGE. 



The purpose of these tests was to determine the safeness of zinc 

 arsenite for use on foliage and its usefulness when combined with 

 other sprays. Apple, pear, plum and peach trees in the Station 

 nursery and individual trees of the dwarf orchard were used. Zinc 

 arsenite was applied to five acres of grapes in the region of Fredonia 

 by Mr. F. Z. Hartzell of the Chautauqua Grape Laboratory of the 

 Station. Applications to elm and willow were made in a local 

 nursery and several sprayings were made in a large basket-willow 

 plantation at Lyons, N. Y. 



EFFECT ON APPLE FOLIAGE. 



Effects on Apple Foliage of Lead Arsenate and Zinc Arsenite Alone and 

 in Combination with Other Materials. 



Lead arsenate, paste Water No injury. 



Lime-sulphur. . . . No injury. 



" " Bordeaux No injury. 



" " Soap No injury. 



" " Glucose Slight marginal burning. 



Zinc arsenite, dry Water Slight marginal injury. 



" Lime-sulphur. . . . Very slight spotting of foliage. 



" " Bordeaux No injury to healthy foliage. 



« " Soap Injury slight, confined to margins and 



points of injury. 



" " Glucose Injury moderate to severe. 



" Lime No injury. 



Lead arsenate, dry Water No injury. 



Lime-sulphur.. . . No injury except to broken leaves. 



" " Bordeaux No injury. 



It is to be noted that no injury to apple foliage resulted from the 

 use of arsenate of lead alone or in combination with bordeaux or 

 lime-sulphur, or from zinc arsenite with lime or bordeaux. Zinc 

 arsenite alone or in combination with soap, glucose or lime-sulphur 

 caused more or less injury. Zinc arsenite caused spotting of the 

 leaves and injury about the margins. The spotting did not appear 



