484 



Insect Pests. 



I). lo,i!il><piiiiix also occm-s in tlie open in South Europe, Africa, Ceylon 

 and the West Indies. 



TllKATMEXT. 



In vineries the best treatment is fumigation with liydrocyanic 



acid "as. For this purpose tlie quantities used vary. It is necessary 



^ to have a separate 



machine for fumicjat- 

 ing for every 10,000 

 cubic feet of space in 

 a vinery. 



A fan should be 

 fixed over the fumes 

 so as to spread them 

 evenly over the house, 

 and tlie time the fumes 

 are allowed to remain 

 should lie about forty- 

 tive minutes. Xo otlier 

 t r e a t m e n t is quite 

 satisfactory, and even 

 the gas treatment 

 wants repeating twice 

 at an interval of about 

 two weeks ((■/(/(' Fumi- 

 gation). 

 The quantities e.-cperimented with by Cousins (1), who first brought 

 this treatment out in this country, are quoted here //; C'frnso : — 



" ViXKiiv A. — Capacity, :'3,4:;;0 cubic feet. 



Early variety. Treated wlien vines in full bloom. 

 Cyanide, 18 oz. ; acid, 27 fluid oz. ; 1 quart water. 

 Temperature, 60" F. Time, halt an hour. After sunset. 



" licsii/f. — ^lealy bug destroyed, foliage unhurt, but three-quarters 

 of the bloom injured. A few mealy bugs appeared at the close of 

 the season after the grapes had been gathered. A second fumigation 

 was therefore decided upon, and the results so far have been com- 

 pletely satisfactory. 



" A"i\Ei;v 1!.— Capacity, :;i,S2,". cubic feet. 



Late \-ariet)'. Treated before vines bloomed. 



Cyanide, 27 oz. ; acid, 40 oz. : water, GO oz. 



Time, 3 hours. After sunset. Temperature, 0(f F. 



FIC. :>14.— Yul'.NG 3IEAI.V BII 



[J. G. nlaki'ii. 

 n-iKii. (X 3.) 



