THE WALNUT — AREA OF CULTURE IN STATE. 



39 



*^tefF®"!Ji?S a new growth, hence there is no danger whatever of the tree being killed 

 wtli if ^ 1 i® largely a matter of loss of crop and injury to spring growth. Its spread 

 Tiwi -^f ^' °epend on the atmospheric conditions each spring. Moisture of the atmos- 

 puere is favorable to the disease, and a dry atmosphere is unfavorable to it." 



ROOT KNOT OR GALLS. 



(Plate XVII, Fig. 2.) 



Among walnut trees these so-called " root knots " or " galls " have of 

 late been quite prevalent. The origin of this curious disease is not 

 fully known, but, in some cases, it is the work of a minute insect — the 

 nematode. So far, the best remedy is to cut away the knots or galls and 

 completely remove the affected wood, and apply a solution of blue- 

 stone in the fall, as strong as the water will dissolve. This is applied 

 with a swab, and the earth again thrown back. The safest way to use 

 bluestone is in the form of Bordeaux mixture, which can be applied 

 any time of year. Take sulphate of copper, 16 pounds; lime, 30 pounds. 

 Dissolve the sulphate of copper in 22 gallons of water; in another vessel 

 slack the lime in 6 gallons of water. "When the latter mixture has 

 cooled, pour it slowly into the copper solution, care being taken to mix 

 the fluids by constant stirring. 



(15) AREA OF WALNUT CULTURE IN STATE. 



The walnut is now found growing throughout the State in almost 

 every county. In 1892 a tree census was made by the State Board of 

 Horticulture, through agents in the field, and the following acreage was 

 found to be in walnuts: 



County. 



Beariag, 

 Acres. 



Not 

 Bearing, 

 Acres. 



Total Acres. 



Alameda 



Alpine 



Amador 



Butte 



Calaveras 



Colusa 



Contra Costa . 

 Del Norte.— 



El Dorado 



Fresno* 



■Glenn 



Humboldt .-. 



Inyo 



Kern 



Kings 



Lake 



Lassen 



Los Angeles.- 



Marin 



Mariposa 



Mendocino— 



Merced 



Hodoc 



Mono 



Monterey 



Napa .-- 



Nevada 



Orange-- 



28 



3 



5 



12 



20 



3 



10 



30 



3 



1 



30 



15 

 ' 1^752" 



7 



12 



13 



1,467 



* Before Madera County was formed. 



6 



7 

 11 

 40 

 50 



5 

 60 

 50 



3 

 41 



2 



37 



1 



4 



16 



28 



6 



1,125 



36 



9 

 12 

 23 

 60 



50 



8 



70 



80 



3 



4 



71 



75 



2 



1,789 



12 



14 



23 



40 



19 



2,592 



