PEAR GROWING IN CALIFORNIA. 



FIG. 162. Pear buds showing stage of develop- 

 ment when second application for scab should be 

 made. (Photo by Claude Van Dyke.) 



made at as nearly the right time as possi- 

 ble each spring. This application must 

 be followed by a second in about one 

 week, or when the cluster buds have begun 

 to separate, as shown in Fig. 163. Both 

 sprayings should be made with the utmost 

 care and in the most thorough manner. A 

 high pressure is desirable in order that the 

 spray may penetrate into the cluster of 

 buds. Either lime-sulphur solution or 

 Bordeaux mixture may be used for the 

 first two treatments. Lime sulphur should 

 be applied at the strength of 1 gallon of 

 lime sulphur to ten gallons of water, and 

 Bordeaux at the regular dormant strength 

 of 20 pounds copper sulphate, 25 pounds 

 lime to 200 gallons of water. Bordeaux 

 paste to be diluted with water is now 

 available and serves the purpose just as 

 well as the home prepared mixture. 



A third treatment for scab is necessary 

 in combination with the first spraying for 

 codling moth, or at the time when the 

 blossoms have dropped from the trees. At 

 this time arsenate of lead and Bordeaux 

 mixture, or arsenate of lead and atomic or 

 milled sulphur can be used. In this case 



Early dormant spray- 

 ing, at one time thought 

 to be necessary in the con- 

 trol of scab, is not impor- 

 tant, but spraying when 

 the buds are beginning to 

 unfold, as illustrated in 

 Fig. 162, should never be 

 neglected. Failure to ap- 

 ply a fungicide when the 

 buds are practically in 

 this stage means failure 

 to control the disease. 

 Therefore promptness is 

 necessary during seasons 

 when scab conditions are 

 favorable. As no one can 

 foresee these seasons 

 there should be no chances 

 taken and the treatment 



FIG. 163. Pear buds showing 

 stage of development when first 

 spraying for scab should be 

 made. (Photo by Claude Van 

 Dyke.) 



151 



