Insects, etc., Injurious to the Vine. 



485 



" Hr.-iii/f. — Jlefdv liiig (lestro)'cd. No injury to viijes. A few 

 ■appeai-eil in the autman and n second fumigation was given, with the 

 same success as in tlie previous case. 



" Vixf.i;y C— Capacity, 1,990 cubic feet. 



Early variety. Treated when grapes the size of peas. 

 Cyanide, G oz. ; acid, 9 oz. ; water, 1~> oz. 



Temperature, 65" F. ; weather v^ery sultry at time. Time, 

 TO rniuutes. 



'' ItiHulf. — Grapes browned and Ivilled. Entire crop lost. Eidiage 

 uninjured. Mealy bug destroyed. The vinery was kept on the 

 cool side, plenty of air 

 given, and splendid growth 

 and promise of fruit iov 

 next year was obtained. 



" A few mealy bugs ap- 

 peared in Octoiier. Eumi- 

 gation was repeated. All 

 the l)ugs were destroyed. 

 The season hail so far ad- 

 vanced, however, that ecgs 

 were to be found on tlie 

 shoots. 



" Tainting the rods with 

 the winter alkali wash in 

 spring and a fumigation 

 before the bloom appears 

 have been decided npon." 



The result of these experiments led Cousins to summarise treat- 

 ment as follows : — 3 oz. cyanide, 5 oz. acid, 8 oz. water per 1,000 

 cubic feet, either before the vines l.Tooni or when grapes are colouring 

 or after the cropj has been gathered. Avoid fumigation wiren the 

 vines are in bloom or before the grapes have commenced to ripen. 



We may take the latter precautions to apply generally. 



Consideral)ly less of the chemicals liave been used with success. 

 Eor instance. Miss May Crooke, experimenting at Bredon's Norton 

 School of Gardening (2), found that 3 oz. of 98 p.c. potassium 

 cyanide, IJ oz. fluid sulphuric, and 4 oz. of water killed all the 

 mealy bugs in 1,920 cubic feet of space. 



At Swanley College a large vinery of 17,750 culiic feet space ^vas 

 fumigated in December for forty-five minutes with I5 oz. sodium 



-MEALY BUa (Dactjllnpill, 

 (X S.) 



