NURSERY AND ORCHARD INSECT PESTS 33 



summer on the foliage of different plants before maturing to deposit eggs for 

 the following year's crop of young. 



CONTROL. Where this pest is troublesome remove and burn injured canes 

 containing the overwintering eggs. Also practice clean culture in and near 

 the patch thruout the year. 



INSECT PESTS OF STRAWBERRIES 



In this state strawberries may be attacked by a large number of insects 

 and diseases but the root louse, leaf-roller, slugs, weevil, crown-borer, tarnished 

 plant bug and white grubs are the most important. Some years the leaf-roller 

 may practically ruin the crop over the important strawberry belt of the states. 

 To nurserymen, the .louse, leaf-roller and the leaf-spot disease are of special 

 importance, since they may be spread on the young plants. 



Root Louse (Aphis forbesi). This louse has been reported as injuring 

 strawberry fields in the state but it has not shown up in any of the fields where 



FIG. 32. Strawberry Leaf -roller; strawberry leaf showing leaflet 

 folded by pest 



plants have been grown for distribution. In the early part of the season the 

 lice hatching from overwintering eggs on the foliage feed by extracting sap 

 from the young growth but later ants carry them underground where they 

 feed on the root system. Where the lice cause trouble in strawberry patches 

 care should be taken not to spread infestation on plants shipped to growers. 

 Dip plants in nicotine solution before setting in the spring and spray infested 

 patches after the overwintering eggs hatch and before lice are carried to the 

 roots by ants. Also destroy old strawberry beds as they may serve as breeding 

 places for lice and other pests of strawberry. 



Leaf-roller (Ancylis comptana}. This small active caterpillar has been 

 the most destructive pests of this crop in recent years in the state. It may also 

 attack raspberries and blackberries. The insect is multiple brooded, having 



