150 HORTICULTURAL MANUAL. 



Tliis stock mixture is diluted for use with from eight 

 to fourteen parts of additional water. The apple- and 

 pear-leayes when mature will bear an admixture to the 

 stock of twelve or thirteen parts of water. But the stone 

 fruits require a weaker solution of fourteen parts of water. 

 In the dormant period spraying for aphis, to reach the 

 eggs, only enough water is used to make it possible to use 

 the solution in the sprayer. 



159. Leaf Aphis of Apple, Plum, Cherry, and Peach. 

 These are not identical species, but their habits are about 

 the same. With the apple the winged lice lay their eggs 

 around the buds of the new growth, which hatch into green 

 lice as the buds begin to expand in the spring. It is about 

 the same with the leaf and young-twig aphis of the plum, 

 cherry, and peach, as the eggs are exposed at the base of 

 the buds prior to the starting of growth in the spring. 



The remedy is spraying in the dormant period with 

 kerosene emulsion (158) made very strong, followed by 

 spraying with the ordinary emulsion when the young lice 

 appear. Still later the nearly mature insects can be 

 reached that have escaped the first spraying by turning 

 the nozzle upward to reach the under side of the leaves on 

 the new growth. 



The same solution can be used in spraying for leaf lice 

 in the greenhouse, garden, and nursery, but cases may 

 occur, as with the cabbage aphis, where hot water or 

 pyrethrum is to be preferred. 



160. Spraying for Scale Aphis. This is a common 

 trouble with the apple orchards in about all parts of the 

 Union. During the summer little can be done, as the 

 insect is well housed under its scale. In the spring the 

 scales cover a number of light-colored eggs that usually at 

 the North hatch in May. When exposed the young insects 

 may be seen in great numbers on the younger growth. 



