INSECTICIDES ON GARDEN AND GREENHOUSE PESTS. 751 



distance of at least two feet from the wall, and three feet all round 

 the stem of the tree. Scrape off all the cocoons from the wall and 

 from the roots of the tree, taking care to collect them as they fall and 

 finally have them burnt. The soil should be deeply buried or 

 subjected to great heat. Boiling water poured upon it has little or 

 no effect upon the pupae. 



(2) Spray the tree, on the first appearance of the larvae, with 

 Paris green (POISON). The first application, when the leaves are 

 tender, at the rate of 1 oz. to 20 gallons of water. The second 

 application from middle of July onwards, at the rate of 2 oz. to 

 20 gallons of water. 

 The Paris green should be of the purest kind, such as supplied by 



A B 



C D 



Fig. 317. — A. Cluster of cocoons of Slugworm, attached and partly formed in 

 mortar (surface next to wall). 



B. Cluster of cocoons (about 100) detached from wall (outer surface). 



C. A similar cluster with several pupae exposed (surface next to wall). 



D. Cloth shred, partly imbedded in lime, through which a slugworm has bored (d) 

 in order to get to earth to pupate. (All natural size. Original.) 



Blundell, Spence & Co., and preference should be given to that which is 

 sold in the form of a paste. 



By adopting the treatment set forth in (1) and (2) I have succeeded 

 in almost exterminating the pest. But it is only fair to add that this 

 result was obtained after considerable time had been spent on experiments 

 with other insecticides, of which I append a summary : 



(1) Lime. — Tw^o dressings of dry slaked lime were applied to the 

 larv« while feeding. Result 



