88 



In mixing lead arsenate it is best to work up the paste 

 into a thin cream with a little water, subsequently adding 

 the remainder. 



Sprays B and C are improved by the addition of i-l lb. 

 of soft soap to each 10 gallons, and when being used they 

 should be kept well shaken up. Half a pound of soap will 

 be enough in the case of B, C and D unless the water is 

 hard, when the full quantity may be allowed. 



THE RASPBERRY MOTH. 



(Lampronia rubiella, Bjerk.) 



The Raspberry Moth, also known in the caterpillar stage 

 as the Red Raspberry Grub, occurs throughout England and 

 Scotland, sometimes causing considerable losses both in com- 

 mercial plantations and private gardens. Next to the Rasp- 

 berry Beetle (Byturus tomentosus) it is perhaps the most 

 serious insect enemy of raspberries in Great Britain. Abroad 

 it is widely distributed on the Continent and appears to be 

 specially harmful in Holland. 



Nature of Injury. If an infested plantation be examined 

 towards the end of April or early in May it will be found that 

 many of the young shoots, particularly those towards the 

 tops of the canes, have withered or died owing to the fact 

 that the inside of each attacked shoot has been eaten away. 

 Inside the tunnel in the shoot is usually found a small red 

 caterpillar or, later, a brown chrysalis. The damage is, there- 

 fore, very characteristic and when a large proportion of the 

 shoots are attacked, great loss of crop may occur, since each 

 injured shoot dies without producing flowers. The only pest 

 with which the larva of the Raspberry Moth is sometimes con- 

 fused is that of another small moth (Aspis udmanniana, L.) 

 which may be known as the Blackberry Leaf Spinner. This 

 pest sometimes feeds on raspberries, the leaves of which it ties 

 up into a large bundle. The caterpillar is brown or chocolate 

 coloured and feeds within the bundle of leaves ; it never burrows 

 into the shoots and may be recognised both by its habits and 

 colour. 



Description and Life-History. The Raspberry Moth is 

 a small insect with a wing expanse of from J-g- inch. In colour 

 the wings are dark purplish brown, often with a satin-like 

 sheen and with several conspicuous yellow spots. The moths 

 appear at the end of May and in June and lay their eggs in 

 the raspberry flowers. In about a week young caterpillars, 

 whitish in colour, are hatched from the eggs and burrow into 

 the receptacle (or plug) of the fruit in which they feed, but 



