THE MONTHLY BULLETIN. 519 



THE MONTHLY BULLETIN 



CALIFORNIA STATE COMMISSION OF HORTICULTURE 



DEVOTED TO HORTICULTURE IN ITS BROADEST SENSE. WITH SPECIAL 



REFERENCE TO PLANT DISEASES, INSECT PESTS, AND 



THEIR CONTROL. 



Sent free to all citizens of the State of California. Offered in exchange for bulletins 

 of the Federal Government and experiment stations, entomological and mycological 

 journals, agricultural and horticultural papers, botanical and other publications of a 

 similar nature. 



A. J. Cook, State Commissioner of Horticulture Censor 



E. J. VosLER, Secretary State Commission of Horticulture Editor 



ASSOCIATE EDITORS. 



Geo. p. Weldon Chief Deputy Commissioner 



Harry S. Smith Superintendent State Insectary 



Frederick Maskew Chief Deputy Quarantine Officer 



Entered as second class matter December 29, 1911, at the post office at Sacramento, 

 California, under the act of July 16, 1894. 



Apple Book. — It is our desire to complete our list of mouop:raphs 

 ou tlie several fruits ffrowu iu California. Almost every mail Ave 

 are receiving requests for such treatises. To the ten already issued 

 in the last three years we now add one on the apple by Chief Deputy 

 State Conunissioner of Horticulture, George P. Weldon. Mr. Weldon 's 

 scientific attainments and his wide experience in Colorado where apple 

 culture is so successfully carried on tit him admirably for this work. 

 We are sure this volume will be heartily appreciated. It will be sent 

 out only on individual application. — A. J. C. 



Time for Pruning Vines.— The viticultural department of the Uni- 

 versity of California has secured interesting results on the etfects of 

 time (m the pruning of vines as it relates to frost injury in spring 

 and the consequent size of crops. It has been found that pruning 

 at different times affects the time of starting growth in the spring, 

 the late starting growth naturally being most likely to avoid frost 

 injury. 



The earliest vines starting in spring were those that were pruned 

 when most dormant. Pruning before the leaves fall in autumn delayed 

 the starting of buds only slightly. Late pruning, after the terminal 

 buds had started in spring delayed the starting of the buds near the 

 base of the canes. Pruning as late as ^March 13 saved the crop from 

 a frost occurring on April 21. Whitewashing the vines after pruning 

 delayed the starting slightly. 



Pruning as related to blossoming showed two things. Late pruning, 

 after starting of buds, delayed blossoming, ^lien early pruning re- 

 sulted in frost injury, the late primed vines blossomed first. 



As affecting the crop, frost injury in spring diminished the crop of 

 early pruned vines. The average crop of early pruned vines at Davis 



