16 FUMIGATION OF APPLES FOR SAN JOSE SCALE. 



possible poisoning of the fruit by absorption of the gas. It is be- 

 lieved that there is very little, if any, gas taken up by the fruit during 

 the process of fumigation — certainly not enough to result in harm to 

 the consumer. The writer, his associates, and many others have 

 freely eaten of fumigated fruit at various times, and in several in- 

 stances the fruit after wiping was eaten within thirty minutes after 

 it had been taken out of the fumigating box. 



To insure uniformity in conducting the tests and in recording 

 results, a blank form 5 inches by 8 inches in size was used throughout, 

 as follows: 



Fruit Fumigation Experiments. Box No Exp. No. 



Locality Date Fruit 



Variety Maturity Source 



Size of fumigatorium Package, size 



Amount deducted Fumigant, rate 



Amounts of chemicals used 



Exposure Begun Closed 



Temperature Condition of fruit as to moisture 



Degree of scale infestation 



Condition of scale before treatment. 

 Results of treatment 



Notes by 



EXPERIMENTS IN 1906-7. 



The fumigation tests with hydrocyanic-acid gas during 1906-7 

 may be grouped as follows: 



(1) Strength-of-gas series. 



(2) Length-of-exposure series. 



(3) Package series. 



(4) Variety-of -fruit series. 



(5) Injury-to-fruit series. 



(6) Low-temperature series. 



Except in the sixth series all tests were made in the basement 

 room referred to, which was supplied with steam pipes for purposes 

 of heating the building, maintaining a temperature for the basement 

 of from 65° to 70° F. An abundant quantity of each variety of fruit 

 used was kept untreated to determine the condition of the scales 

 from time to time during the winter. The condition of the scales on 

 Baldwin and Rhode Island Greening apples during the winter of 

 1906-7 is shown in Table II, and in addition to furnishing a basis of 

 comparison with the treated fruit will serve to show the increasing 

 mortality of the scales as the season progressed. 



