46 



it does not appear that these natural enemies are alone capable 

 of keeping the pest in check and recourse must therefore be 

 had to artificial measures of control. 



Methods of Control. 



A. In Orchards where Spraying can be practised (1) It 

 the trees are covered with moss and loose bark they should be 

 cleaned by means of an alkaline winter wash (see Leaflet 

 No. 7U,* The Renovation of Xt'-ylectrd Orchards). This will 



the number of cracks and crevices in which they can spin 

 .their cocoons. 



(2) The trees should be sprayed with lead arseiiate just 

 after the petals have fallen. It will be found that there is 

 a period of from 7-14 days during which the calyx cup, 

 subsequently the eye of the apple, is open, while later it 

 closes. The object in spraying is to force the arsenate into 

 the calyx cup, where it is retained after the calyx closes, 

 with the result that any Codling larva which attempts to 

 'burrow through the " eye " of the apple is poisoned. It is 

 useless therefore to spray too late, when the calyx cup is 

 closed, for then the poison cannot reach the point at which 

 ic will be needed, but it is also necessary to wait until the 

 blossom has completely fallen to avoid poisoning the bees. 

 A nozzle giving a fine spray is usually used! and the spray 

 should be directed as much as possible on to the young 

 fruitlets. 1 Ib. of lead arsenate paste should be allowed to 

 every 20-25 gallons of water, or the water may be replaced 

 by a similar quantity of Bordeaux Mixture if it is desired to 

 -control fungus diseases as well. The lead arsenate spray in 

 addition to checking the Codling Moth will also destroy any 

 'leaf -eating caterpillars, such as those of Winter Moths, which 

 may be present. 



B. In Orchards where Spraying is impossible. (1) The 

 trees may be banded in Junef with old frayed sacking, 

 -folded paper or ropes of hay, If possible, two bands 

 4-6 inches wide should be used on each tree, one just below 

 the junction of the branches with the trunk and the other a 

 /few inches from the surface of the ground. The upper band 

 will catch those larvae which crawl down the branches, while 

 the lower will arrest those which fall from the tree and 

 crawl back to the trunk. A single band is fairly effective 

 and may be placed at any convenient height on the trunk, 

 which must be cleaned as far as possible (see Section 3 below). 

 The bands must not be made "sticky." The larvae on 

 leaving the fruit are likely to make their cocoons in the folds 

 of the sacking or in the hay, and the bands must therefore be 

 burnt in the autumn after the apples have been gathered. 



* Obtainable from the Ministry. 



I If bands are applied at the end of May or very early in June, they 

 will also trap Blossom Weevil. 



