JOURNAL 



OF THE 



Royal Horticultural Society. 



Vol. XXVIII. 1903. 

 Parts I. and II. 



PESTS OF ORCHARD AND FRUIT GARDEN. 

 By M. C. Cooke, M.A., LL.D., A.L.S., F.R.H.S., V.M.H. 



Fbuit-geowees will find indicated in the following pages most of the 

 pests which are likely to trouble them in their occupation. The 

 arrangement is rather an artificial one, but it appeared to be best suited to 

 the wants of practical men. Orchard trees will occupy the first portion, 

 whilst the latter will be assigned to bushy and herbaceous plants with 

 marketable fruits. Anomalies may be sometimes anticipated, as, for 

 instance, placing Melons with Gourds and Cucumbers in the kitchen 

 garden, and Tomatos in juxtaposition with Potatos. The Grape Vine 

 and Pineapple, and similar tropical fruits, will have to be dealt with by 

 themselves. 



Apple-leaf Spot. 

 Septoria pyricola (Desm.), PI. X. fig. 1. 



Spotted leaves are common enough in the orchard and elsewhere, 

 but they may have many causes, known and unknown, and cannot all be 

 attributed either to insects or fungi. In most cases the spots on the 

 leaves, although destructive to the leaf, unless very prevalent do not 

 affect materially the general condition of the tree or the production of 

 fruit, except in a few instances of a virulent kind. 



In the present instance the spots occur on the upper surface of the 

 leaves of Apple or Pear, and are of a greyish-white with a narrow brown 

 margin. They are commonly somewhat rounded, from a quarter of an 

 inch in diameter. The substance within the spot is killed by the 

 mycelium and bleached, with the surface sprinkled or dotted with little 

 black points not larger than the prick of a pin. Each of these points 



B 



