236 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



which they are likely to have at any time. For this reason, while we 

 advise all fruit growers having extensive orchards to procure a dusting 

 machine, we believe that it should be used to supplement the spray rig 

 and to aid in supplying a fungicide to the trees when weather or other 

 conditions make it impossible to provide fungicides for their protection 

 in a liquid form.. Our experience leads us to believe that whether or 

 not success against fungi can be secured with dusting will be determined 

 by the character of the weather. 



Mr. William Moore: Some one has said that nicotine sulphate is 

 not volatile, pointing out that it hydrolyzes and was then volatile. 

 When it hydrolyzes it is no longer nicotine sulphate. Nicotine sulphate 

 is not volatile. 



Mr. Ruth : I made that statement. It does hydrolyze and the nico- 

 tine beccm.es volatile as nicotine. Therefore you can obtain the result 

 with nicotine sulphate by its hydrolysis, which I believe is essentially 

 a correct statement. 



Mr. William Moore : In dusts you will not have a high degree of 

 hydrolysis since the amount of water present is very small. 



Mr. Ruth : The amount of water is adsorbed just as the nicotine is 

 adsorbed. 



Mr. McClintock: I would like to ask Mr. Quaintance a question. 

 He knows the severe curculio situation in Georgia. Under those condi- 

 tions, would there be any advantage in applying a spray or dust earlier 

 than the ones usually put on; then again, another one later, very close 

 to the time of harv^est. 



Mr. a. L. Quaintance: The peach spraying schedule provides for 

 two arsenate of lead applications. On the average, that is about all 

 that it is safe to apply. A plan to put on additional treatments has been 

 followed b^^ several orchardists. In some seasons the injury has not 

 been great ; in other seasons the injurj^ has been worse than the curculio 

 or brown rot. I think some of the growers in the Ft. Valley section 

 will this year apply three or perhaps four applications of arsenate of 

 lead. The first application will be made as soon as the blossoms fall. 

 The use of arsenate on the fruit shortly before harvest is to be dis- 

 couraged. Probably, however, a good man^^ growers will make a fourth 

 .application of arsenate at about that time. 



The present situation as to the curculio in Georgia is due apparently 

 to weather conditions. For the past two seasons they have had exces- 

 sive rains and hot weather. The curculio in the course of its life cycle 

 goes into the ground. It is well known to those who have studied this 

 insect that showers, softening the earth, are ver\- favorable to the 



