ABSTRACTS. 343 



ing composition : Copper sulphate, 5 lb. ; fresh (unslaked) lime, 5 lb. ; 

 water, 50 lb. 



The following table clearly demonstrates the benefit derived : — 



Yield of Potatos 



Pounds per i Acr 



Bushels per Acre 



North part unsprayed 

 Adjoining rows sprayed 

 South part unsprayed 

 Adjoining rows -prayed 



Merchant- 

 able 



Small 



Rotten 



Merchant- 

 able 



Small 



Rotten 



553 



96 



101 



184 



32 



34 



957 



95 





319 



32 





330 



94 



81 



110 



31 



27 



738 



90 





246 



30 





The relative values of ready-made commercial and freshly prepared 

 Bordeaux mixtures were compared, and it was found that so long as the 

 solution of the former contained as much copper as the latter it was 

 equally effective. The second article emphasises the value of spraying 

 for the suppression of insect enemies of the Potato, early and late blight 

 and other leaf diseases of the Potato, describes the necessary apparatus, 

 and gives formula? for the making of the necessary spraying solutions. 



F. J. C. 



Potatos : Experiments with Fungicides. By Chas. D. Woods 

 (U.S.A. Exp. Stn. Maine, Report for 1901, pp. 49-57).— Spraying experi 

 ments with Bordeaux mixture were successfully carried out, and demon- 

 strated the value of Bordeaux mixture when applied on a large scale, not 

 only in diminishing the blight, but increasing the yield of the crop. The 

 money value was represented by the investment of 10s. as the cost per 

 acre with a return profit of £8 per acre as compared with unsprayed 

 sections. — M. C. C. 



Potato Worm (Gelechia operculella, Zellr.). By W. T. Clarke 

 (U.S.A. Agr. Exp. Stn., California, Bull. 135 ; 10/1901 ; 10 figs.).— The 

 grub of the " Potato worm " causes great injury to Potato and Tobacco 

 crops in the field and in store in California and in other parts of America, 

 Australia, New Zealand, &c. The moth, which is a small greyish insect, 

 lays its eggs in the eye of the Potato in the storeroom. The larva is 

 hatched in about a week and bores into the Potato. It is a pinkish white 

 grub with darker thorax and head, about \ in. long when fully grown. It 

 pupates in about six weeks from hatching either in the mouth of the 

 burrow or in some crack or cranny near where the Potatos are stored, 

 spinning a cocoon and covering it externally with dirt, &c. It remains 

 in the chrysalis stage about two weeks. Eggs are also laid outdoors on 

 the Potato plant. The larva? then bore down into the plant, feeding just 

 beneath the epidermis. Fungus attacks follow in the wake of the insect, 

 and the stem succumbs to the combined onslaught. The life -cycle is 

 completed in California in about 66 days. 



Experiments are recorded w T hich show that the Potatos may be 

 infected in five ways : — 



1. By infection of the stem. 



