24 MAINE AGRICULTURAL EXPERIMENT STATION. I912. 



the Niagara carbonic acid gas sprayer and were very thorough 

 in every respect. 



The weather during these and all other applications in the 

 Greene orchards was favorable. As the town is only 6 miles 

 from Highmoor, the conditions described for the latter locality 

 will apply fairly well for the cooperative work. 



Results. By July 21 considerable sunscald had been pro- 

 duced. This was common to all trees, irrespective of the nature 

 of the spray. Aside from the 24 trees in question, the rest of 

 Mr. Keyser's orchards had been treated with the insoluble lead 

 arsenate alone. Unsprayed orchards in the vicinity showed 

 injury of similar nature and of equal amount. 



The foliage here, as in all other plots considered in this bulle- 

 tin, was most excellent. Scab was practically absent and the 

 sajne was true of chewing insects. 



No ill effect of the spray itself was found either on fruit or 

 leaves. The adhesive power of the mixture was here, and m 

 all the experiments under discussion, excellent. 



The table on page 25 indicates the results. The same state- 

 ment regarding the curculio-injured and the "wormy" fruits 

 in the table of the Highmoor results (pp. 14 and 15) holds true 

 here, except that the wormy apples in the Philbrook plot con- 

 sisted almost entirely of injury done by the codling moth and 

 other chewing insects. In the case of both Mr. Coburn's and 

 Mr. Keyser's plots the conditions allowed for a full count of all 

 the fruit on the trees. 



Discussion. The results of the three plots at Greene may be 

 briefly considered as a whole. As at Highmoor, we have this 

 year learned nothing regarding the efficiency of lime-sulphur as 

 a fungicide, since the development of fungi was practically 

 prevented by weather conditions. 



The use of a gas sprayer in making the applications pro- 

 duced no injury that could in any way be ascribed to it. 



Where sunscald occurred, the injury was increased by later 

 applications, irrespective of their chemical nature. 



No foliage injury occurred from the use of lime-sulphur and 

 lead arsenate combined. 



Russeting in all these plots was so utterly insignificant :n 

 amount as well as degree that whether the few cases were due 

 to natural agents or to spraying is totally immaterial, so far 

 as the production of high grade fruit is concerned. 



