1696 



ENCYCLOPEDIA OP PRACTICAL HORTICULTURE 



Imiiurts 01 riiiius niul Prunes — Year 

 Eiidiiie .liiiio 30. 1910 



Plums in Alaska. See Alaska. 



PLUM DISEASES 



Bladdebs. See Pockets, this section. 

 Brown Rot. See Cherry Diseases. 

 Canker.s. See Apple Diseases. 

 Crown Gall. See Apple Diseases. 

 FiBE Blight. See Pear Diseases. 

 GuMMOSis. See Cherry Diseases. 

 Leaf Curl. See Peach Leaf Curl under 

 Peach Diseases. 



Mildew. See Cherry Diseases. 



Pockets or Bladders 



Exoascus sp. 



American varieties of plum are some- 

 times attacked by a fungus related to the 

 leaf-curl fungus. This causes enlarge- 

 ment of the young fruits which are hol- 

 low; because of this condition they are 

 sometimes alluded to as "bladders." The 

 conditions which bring about the disease 

 are the same as those of leaf curl, viz., 

 excessive cool wet weather in the early 

 season. The winter spray as for leaf 

 curl should be effective. 



Fob Remeiiy, see Leaf Curl, under 

 Peach Diseases. 



A. D. Selby, 

 Wooster, Ohio. 



Root Rot. See Apple Diseases. 



Hist. See Peach Diseases. 



Shot-Hole Fungus. See Cherry Dis- 

 eases. 



Spot. See Apple Diseases. 



Sun Scald. See Winter Injury under 

 Apple Diseases. 



Twig Blight. See Apple Diseases. 



Winter lN,7URy. See Apple Diseases. 



PLUM PESTS 



American Silk Worm 



Not likely to become important where 

 spraying is done for other pests. 



ApHms. See Aphids. 



Bauk Beetle. See Shot-Hole Borer, 

 under Cherry Pests. 



Brown Day Moth. See Prune Pests. 



Bud Moth. See Eye-spotted Bud Moth, 

 under Apple Pests. 



Buffalo Tree Hopper. See Apple Pests. 



Crickets. See Raspberry Pests. 



Curcnlio 



Conotrachelus nenuphar Hbst. 

 H. F. Wilson 



This insect is one of our few serious 

 pests found native to America, and was 

 one of the first to be written about and 

 recommendations made for control. 



So far as known it does not occur west 

 of the Cascade mountains, and it is to be 

 hoped that this barrier will continue to 

 be as effective in the future as it has 

 been in the past. The original food 

 plants ssem to be plums and wild crab- 

 apples. At the present time, In addition 

 to these fruits, cultivated peaches, plums, 

 cherries, apricots, apples, pears, etc., are 

 attacked. 



The main injury to the fruit is caused 

 by the egg and feeding punctures made 

 by the adults and the work of the la,rvae 

 in the fruit. 



Life History 



The insect hibernates through the win- 

 ter as an adult under boards and trash 

 on the ground and comes out in the 

 spring about the time the buds are swell- 

 ing and begins feeding and depositing 

 eggs in the fruit as soon as It is well set. 

 Egg-laying may continue for several 

 weeks and the eggs hatch in from three 

 to six days, depending upon the tempera- 



