EXPERIMENT STATION WORK WITH INSECTICIDES. 275 



Tn jnroneral, however, the station had best results from sprayin*!;. The 

 beetles usually appear about June '25, and sprayin<; should be^jin at 

 once. In the station experiments arsenate of lead was used at the 

 rate of 4 pounds in 50 trallons of water or Bordeaux mixture. It was 

 found that this insecticide could be applied at a cost of about $3 

 per acre at each application. The results obtained durin<r a two 

 years' test were very satisfactory. It is concluded, therefore, that the 

 grape root-worm can be effectively controlled by this insecticide and 

 apparently it is the cheapest and simplest method for fighting the 

 pest. Considerable attention was given also by the same station to 

 the control of the grape-berry moth." In the case of this pest also 

 it was shown that poisonous sprays are effective. When arsenate of 

 lead was api^lied at the rate of 10 or 12 pounds per 100 gallons of 

 water just before the blossoms opened, just after the petals fell, and 

 when the berries Mere about the size of small peas, almost complete 

 protection was secured from the insect during the rest of the season. 

 Certain growers used arsenate of lead at the rate of 8 pounds per 90 

 gallons of water. This a])plicati()n is effective only against the 

 ^pring brood of caterpillars, which attack the blossoms and recently 

 set fruit clusters. 



THE PISTOL CASE-BEARER. 



The pistol case-bearer nuist be classed as one of the important 

 ai)ple pests. In New York it sometimes appears in large numbers ^ 

 and does serious damage. It was found that the pest may be success- 

 fully controlled by a thorough application to infested trees of Paris 

 green at the rate of 1 jjound per 150 gallons of water. Enough lime 

 should be used to give the mixture a milky appearance. In the suc- 

 cessful experiments carried out by the New York State Station the 

 trees were sprayed three times, the first application being made before 

 the buds began to swell, the second after the young leaves had ap- 

 peared, and a third just after the petals had fallen. 



THE SaUASH BUG. 



During the summer season the squash bug in badly infested locali- 

 ties renders it almost impossible to raise squashes. Experiments were 

 carried out at the New Hampshire Station " to determine practical 

 remedies against this pest. In cases of the worst infestation it ap- 

 peared to be impracticable to raise squashes. On a commercial scale, 

 however, more elaborate and successful methods nuiy be adopted. In 

 general, the use of protective nettings over young plants is recom- 

 mended together with excessive seeding, good culture, and destruction 



oNew York Cornell StJi. Rul. 22.^ 6 New York State Sta. Bui. 122. 



New Hampshire Sta. Bui. 80. 



