VIII CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. 
Page. 
Circular No. 23. — Potato Diseases in San Joaquin County, California. 
Introduction :i 
Potato wilt 4 
The cause of "potato-sick" lands 4 
Description of the wilt 4 
The dry-rot of the tubers 5 
Relationship of potato will to similar diseases in other crops 5 
Soil fertility not a factor affecting wilt 6 
Manner of infection and spread 6 
Remedial measures for wilt 6 
Rotation of crops 7 
Wilt-resistant varieties of potatoes 7 
Sanitary measures 7 
A healthy seed supply 7 
Potato seal) 8 
Losses from scab 8 
Cause of scab s 
Preventive measures for seal) 9 
Seed treatment for scab. 10 
Cost of seed treatment 11 
Decay of potatoes 11 
Cause of the " leak " 11 
Remedial measures for the ' ' leak " 11 
Rotation problems 12 
Forage crops 12 
Small grains for hay 13 
Rye-grass 13 
Vetches 13 
Alfalfa 14 
Other forage crops 14 
Circular No. 24. — Alfalfa in Cultivated Rows fob Seed Production in 
Semiarid Regions. 
Introduction 3 
Principles underlying alfalfa seed product ion 5 
The relation of insects to the setting of alfalfa seed 8 
Areas to which the growing of alfalfa for seed in cultivated rows is adapted. 10 
Selection of soil 11 
Location of fields 11 
Preparation of the seed bed 12 
The prevention of the drifting of soil 13 
Choice of seed for cultivation in rows 14 
Met hod of seeding in rows 14 
Rate of seeding and thickness of stand 15 
Seeding in check rows to permit cross-cultivation 16 
Time of seeding 17 
Treatment of the stand the first season .' 17 
Treatment of the stand after the first season 18 
The right crop to leave for seed IS 
Harvesting the seed crop 19 
Possibilities of ^rvi\ production in cultivated rows 20 
Developing valuable strain.- for seed production 22 
Conclusion -'."> 
