Insect and Disease Control 219 



The fungicide of greatest value to the peach-grower, how- 

 ever, is self-boiled lime-sulfur mixture. Other sulfur prep- 

 arations are also used to a limited extent. Bordeaux 

 mixture, for many years the most effective^ fungicide avail- 

 able to the fruit-grower, was never satisfactory for use on 

 peach trees because of its frequent serious injury to the 

 foliage. The development of the self-boiled lime-sulfur 

 mixture made a new epoch in peach spraying and in peach- 

 growing, since by its use the nearly complete control of 

 certain serious diseases became possible, whereas formerly 

 these diseases served practically as limiting factors in the 

 growing of peaches. 



A discussion of the preparation and application of these 

 insecticides and fungicides follows the sections treating of 

 peach insects and diseases. In the discussion of the individ- 

 ual insects and diseases, the aim is to give the grower such 

 information as is needed to enable him to treat them suc- 

 cessfully, no effort being made to supply in this connection 

 complete descriptions or life histories. 



PEACH INSECTS 



Plum curculio {Conotrachelus nenuphar) 



This insect is also known as "plum weevil," "peach 

 curculio," "peach worm," "little Turk," and by other 

 names. It is the principal cause of "wormy peaches," 

 except on the Pacific coast. 



Appearance. 



The adult is a small beetle about te inch long, charac- 

 terized by a roughly ridged back and a long snout; the 

 prevailing color is dark gray or black. 



