58 MAINE AGRICULTURAL EXPLRIMLNT STATION. I9II, 



foliation was marked and from the general appearance of the 

 plot at the close of the season it may be assumed that the vigor 

 of the trees was considerably impaired (Fig. 56). Injury was 

 increased by the final application, although this was at a greater 

 dilution than the weakest strength recommended by the manu- 

 facturers.* 



In comparison with the lime-sulphur sprays the bordeaux 

 plots showed a markedly greater degree of leaf injury, estimated 

 at 25 per cent. The characteristic leaf spotting was produced 

 (Fig. 47), followed by a moderate amount of yellowing and 

 leaf fall to a lesser degree. (Fig. 58.) No difiference in effect 

 on foliage was noted between the two strengths of bordeaux. 

 The foliage suffered markedly in comparison with the lime- 

 sulphur plots, after allowing for differences in appearance due 

 to the color of the two sprays. 



The adhesive quality of all the commercial solutions as well 

 as the home-boiled concentrate was excellent on leaves and fruit, 

 and compared well with bordeaux. The self-boiled mixture 

 was inferior in this respect. 



Effect on Fruit. Contrary to the experience of most investi- 

 gators, all the plots showed injury to fruit.** Not even the self- 

 boiled sulphur plot was free in this respect. The injury was of 

 two kinds ; one a russeting, roughening and pustulation of the 

 skin, frequently accompanied by malformation and practically 

 identical with the several degrees of bordeaux injury. The 

 most severe injury on any of the lime-sulphur plots was some- 

 what less than the greatest injury from bordeaux (Fig. 51). 

 No cracking or folding of the skin accompanied the former, and 

 while russeting was quite common, it was of a nature in cases 

 where malformation was absent to detract but slightly from the 

 market value of the fruit. 



The other form of spray injury, confined to fruit sprayed with 

 sulphur solutions, occurred without exception at the calyx end, 

 and will be designated as calyx injury. 



* The manufacturer's directions accompanying "Sulfocide" give Paris 

 green as the insecticide to be used with it. Lead arsenate was used in 

 this experiment to determine its action, as no field test of such combi- 

 nation seems to have been reported. 



**NoTE. — It should be borne in mind that the Ben Davis is especially 

 susceptible to spray injury, as compared with some other varieties. 



