432 TwiixTv-KiGiiTH Annual Ri;port 



that are stored. Jmniersing' seed potato tubers for two liours in a 

 solution C(jntaining- one ounce of 40 per cent formalin to e\'ery two 

 gallons of water is of no avail with this disease, since the fungus 

 occurs inside the tubers. 



A serious disease of date fruits, both green and ripe, has devel- 

 oped at the Yuma date orchard. This has been evident for several 

 years, though it is less troublesome during some seasons than 

 others. At least 90 per cent of this gear's fruit crop was damaged. 

 The fruits become nuimmificd and accpiire a bitter taste, thus ren- 

 c'ering them unfit for use. Professor Brow^i has been investigating 

 this disease and will be able very soon to announce the results of 

 his work. Three species of fungi have been found associated with 

 this disease. It is not too much to expect that this disease can be 

 controlled when the life hist()ries of these fimci are known. 



',•3' 



PUBLICATIONS 



Timely Hint No. 121, Tamarisks for vSouthweslern Planting, 

 treats of a group of Old World plants that are very resistant 10 

 our conditions of heat, drought and alkali. They are also tolerant 

 to considerable cold. The plants are large shrubs or small trees 

 and ])ropagate readilv from cuttings, requiring little attention when 

 once established. They blossom profusely during the spring and 

 early summer and with their foliage and flowers are ver}' orna- 

 mental. They are excellent f(^r windbreaks and ornamental plant- 

 ing in dry-farming communities. Very alkaline spots, often other- 

 wise useless, may be set to these plants and made to produce an 

 abundance of fuel for the home. Thus far, no soils have been found 

 too alkaline for the successful growth of these plants. One species, 

 Tamarix artlciilafa. is evergreen and promises to be a valuable orna- 

 mental. Its growth is s^nimetrical and tree-like and it gives the 

 appearance of an Arizona cypress. Already it is being planted 

 considerably in Southern California. It cannot endtn-e, without 

 injurv. temperatures below 10 or 12 degrees F. 



Tiinely Hint No. 122, Roses for the Arizona Home. This was 

 written in response to numerous inquiries on the subject of roses 

 for Arizona conditions. The more hardy roses are discussed briefly 

 and a list of the varieties that have been foimd best suited for grow- 

 ing under our conditions of soil and climate is given. Among these 

 are tea roses, hybrid teas, hybrid perpetuals, dwarf ram1)lers, China 

 or Bengal roses, and ever-blooming, climbing roses. Such topics 



