PEACH AND NECTARINE PESTS. 113 



Louse (Ptychodes juglandis) infests the upper sides of the 

 leaves, and the Common Wahiut Louse (Pterocallis jug- 

 UmdicoH) the under sides of the leaves, both sucking out 

 the sap and cripphng the growth. The Walnut Leaf-Gall 

 Mite (Eriophyes triseriatus erinea) also causes blaelder- 

 like swellings on the leaves. 



PiEAiEDiEs. — Spray for the Aphis with Formula No. 14. 

 For the latter there is no remedy except to j)ick off and 

 burn infested leaves. 



Other Pests — The Winter, Mottled Umber, and 

 Buff-tip Moth larvie; Aphis, and Leaf Weevils attack the 

 filbert and cob-nut; the Wood Leopard Moth larvae the 

 walnut. 



CHAPTER VI. 



PEACH AND NECTARINE PESTS. 



A INSECTS. 



Peach Scale (Lecanium Persicoe). — Another species 

 of scale insect, similar in form to the Mussel and cither 

 Scales previously described. The perfect female wingless 

 insect is oval in shape, brownish in colour, with a stripe 

 down its back and a pale margin. The male has wings. 

 When it reaches maturity the female insect beneath the 

 scaly covering dies, and its place is taken by a cluster of 

 eggs. In spring the eggs give birth to larvoe, win' eh 

 wander over the shoots till they find a suitable spot ; tlien 

 they pierce the epidermis with their beaks and suck out 

 the sap. Here they remain till they lay eggs, then die. 



Remedies.— Spraying the tree with a Kerosene Emulsion 

 (Formula 16) or with Formula No. 1 when the leaves are 

 off are the most efftcacious remedies. All leaves should 

 be burnt when they fall off. 



