150 Second Report ou Ecojwmic Zoology. 



Not only are they laid on prunes, but also on the apple, and 

 probably on peach and nectarine. They are firmly attached by a 

 gummy excretion formed by the parent, and are too thick-shelled 

 to be affected by caustic alkali wash. 



Treatment. 



This pest can easily be kept in hand if attacked in its early 

 stages. When once the females commence that remarkable and 

 rapid production of living young and the leaves begin to curl up 

 they are difficult to destroy ; not only do the curled leaves protect 

 them, but they are also covered with mealy powder, which helps 

 repel the insecticide. 



Washing should begin as soon as the leaves unfold, and must be 

 continued every now and then, at intervals of a week. 



Some good will be done l)y spraying, even when the leaves are 

 curled up, but not so much ; to be successful the lice must be killed 

 before they enter the breeding stage. 



Quassia and soft soap, or paraffin emulsion, may be used for this 

 purpose. 



Another green aphis, the Hyaloiitervs pruni, Fabr., also infests 

 plums, swarming under the leaves and producing white hoary masses, 

 but which do not seem to curl up the leaves in the characteristic 

 way done by the common plum aphis. 



This apterous vivipnrous female is flat, pale green with dark green 

 mottKngs and a dark dorsal stripe, and dusted with white meal. The 

 winged viviparous female is Ijright pale yellowish-green, with red 

 eyes and dark green thoracic lobes ; cornicles green, very small ; legs 

 pale green ; the wings with a yellow base and stigma. 



The oviparous female lays her eggs near a leaf bud ; the eggs are 

 covered with a mealy coat. 



It may frequently be found doing damage, but not nearly to the 

 same extent as the former species. 



Gas Treatment of Nursery Stock before Planting. 



Information has been asked regarding the fumigation of nursery 

 stock. All nursery stock should certainly be fumigated. 



The bushes or young trees .should be placed in a box or canvas 

 tent of known capacity and subjected to the fumes of hydrocyanic 

 acid gas for one hour. Large numbers can be treated at once at little 

 expense. After the stock is stacked under the tent or in the box a 



