»-37" ROOTSTOCK 
(Plant Patent No. 904, *Trade Mark) 
A Valuable Resistant Peach Rootstock 
Resistant to Soil Nematodes 
ECONOMIC VALUE 

S-37 is a seedling rootstock for drupe fruits proven for more than nine years to be 
consistently more resistant to Nematode than any of the other standard resistant peach 
rootstock varities, including Shalil, Yunnan and Bokhara. Standard varieties budded on 
9-37 stock produce trees far more vigorous than those budded on Shalil, Yunnan, Bokhara, 
etc., and most important of all, this vigorous growth is consistently uniform throughout the 
orchards where Nematode exists. S-37 has been widely distributed, tested and acclaimed! 
State experimental stations in California, Colorado, Maryland, Tennessee, South Carolina 
and Virginia have tested it and found it far more resistant than the others. A multitude of 
leading fruit growers, pomologists, plant pathologists, nurserymen, horticulturists, agri- 
cultural commissioners and farm advisors throughout California have testified as to its 
superior resistant qualities under actual orchard conditions. These tests have proven that 
9-37 will thrive on all types of soil, both sandy and heavy loam, and will produce com- 
mercial fruit wherever peaches can be grown. It is predicted that S-37 will soon replace 
all of the other resistant Peach rootstock in use. 
ORIGIN OF S-37 ROOTSTOCK 
In 1935 an experimental plot of three thousands seedlings of the ornamental flow- 
ering peach, Prunus persica var., in ten mixed color varities, were planted in Stribling’s 
Nurseries Experimental Grounds at Atwater, California. This plot was set out primarily 
to discover some possible control for Crown Gall. The sandy soil in the plot was heavily 
infested with Nematode. In the course of the experiments, several of the three thousand 
flowering peach seedlings seemed to show marked vigor in growth. These few vigorous 
seedlings were seed sports—natural variations off of the parent plant with certain new 
and unique characteristics. The unique charateristic in this case was an apparent marked 
resistance to the Nematode in the soil. 
The next stop was to see if this resistance could be propagated and used on a 
commercial scale. Buds were taken from the selected few seedlings found most resis- 
tant and a seed orchard was set out to reproduce the seeds. The seedlings thus asexually 
reproduced were also found to be very resistant to Nematode, and successive generations 
were as well. The remarkable discovery was, that although there is naturally a lot of 
variation in propagation by seeds, these seedlings were uniformly and consistently re- 
sistant to Nematode and also to CrownGall. Further seedlings were made, and the best 
was S-37, S-37 being the code number used in the experimental plot. A large budded 
seed orchard of S-37 was then set out and it now produces all of the S-37 seeds used 
throughout the country. 
AVAILABILITY 
Production of S-37 rootstock has advanced on such a wide scale that. it now is 
available in any quantity in most nurseries throughout the State of California in June 
budded varieties, or, in special cases, as seedling understock. Current prices will be 
gladly quoted on request. Advance orders on some of the budded varities are your 
assurance of completely filled needs. At present five grower nurseries are licensed to 
grow S-37 rootstock and all nurseries can obtain trees from Stribling’s Nurseries, or their 
licensed growers. For 1951-1952 season a complete variety listing will be available in 
both June Bud and Yearling trees. 
RESTRICTIONS 
The $-37 Peach Rootstock is protected by United States Patent No. 904, issued the 
sixth day of December 1949. This patent insures the genuine strain of S-37 Peach Root- 
stock and governs its reproduction. Stribling's Nurseries is the sole source of supply of 
S_37 seeds and seedlings. It is illegal to directly or indirectly dispose of any 8-37 seedlings 
or bud wood of §-37 Seedlings, or to permit its use, for the commercial or home propagation 
of trees, or for top working of any established trees without a written agreement with 
Stribling’s Nurseries. 
KNOW YOUR ROOTSTOCK REQUIREMENTS BEFORE YOU PLANT 
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