60 Report of State Board of Horticulture. 



vinced that the present immunity can be accounted for on the 

 ground of isolation rather than that of peculiar climatic con- 

 ditions, and that it is not likely to be permanent. Coos Coun- 

 ty is a beautiful region, broken, mountainous and timbered. 

 Its only connection with the outside world is by boat, or by 

 wagon roads over the mountains from Drain or Roseburg. 

 The codling moth must of necessity be introduced by one or 

 more of these routes. As shown above, the absence of or- 

 chards in the immediate vicinity of Empire and. Marshfield, 

 render it unlikely that the moth could obtain a foothold even 

 though repeatedly introduced at these points in imported 

 fruit. From Drain it has advanced from orchard to orchard 

 nearly to tidewater at Scottsburg, where it has been checked 

 hy the absence of other orchards to conquer. From Roseburg 

 it has spread along the Roseburg-Myrtle Point route over the 

 mountains to within ten or twelve miles of the latter place, 

 and is reported in several orchards about there. It is also 

 reported in several orchards about the head waters of the 

 Coos River, having probably advanced from orchard to or- 

 chard along the wagon road from Roseburg to Coos Bay as 

 it has along the Roseburg-Myrtle Point route. 



It seems evident that the reason for the present immunity 

 from codling moth ravages in the orchard of the Coos Bay 

 region is not far to seek. On account of its geological con- 

 formation, the highways leading to this region mostly follow 

 the windings of the streams in and out of the timber-covered 

 mountains. The orchards, mostly home orchards, are located 

 here and there along the highways in little valleys or pockets 

 between the mountains, often at considerable distances apart. 

 Each orchard, or little group of orchards, is therefore pro- 

 tected by a natural barrier of timber and mountains, prac- 

 tically insurmountable to the codling moth unless it be carried 

 over or around it by human agencies. 



I believe the idea that climatic conditions are responsible 

 fur the absence of codling moth injury has been decidedly 

 harmful. It has carried with it the idea that no effort is 

 nocessary to keep the orchards free from this, the greatest 

 apple pest. I believe that by a rigid system of orchard in- 

 spection put in operation a few years ago along the highways 



