PREPARATION OF BULLETINS The larger part of the writer's time in Experiment Station work was spent in the preparation of a bulletin on the grasses of Arizona. A small amount of work remains to be done on this publication. Additional study has been made on the poison plants of our grazing ranges. This applies in particular to the loco weeds, larkspurs, death camas, and the whorled milkweed. A bulletin on the cultivated ornamental shrubs of Arizona is in process of completion. This treats of about one hundred and twenty-five species and varieties of deciduous and evergreen shrubs and includes a brief description of each one, together with a discussion of the soil, temperature, altitude, and cultural conditions best suited for its successful growth. This work is being done in collaboration with Miss Ethel Pope, an advanced student who has made a careful study of our ornamental plants. It is planned to follow this publication with a similar study of our ornamental trees and vines. The work in ornamental plants has developed to its present importance through studies in plant introduction and ornamentation both in the Experiment Station and the Department of Biology in the University. DAIRY HUSBANDRY W. S. CUNNINGHAM, R. N. DAVIS The outlook for dairying in Arizona is much brighter than it was a year ago. The industry is reviving in the Salt River Valley, where many dairy herds were disposed of in 1918, 1919, and 1920, and it is expected that there will be a large increase in the number of cows in that valley during the next year. Dairying is also becoming a major industry in Cochise, Pima, Pinal, Graham, Navajo, and Apache counties. One Jersey cow, Aldan's Oxford Nora, and a Jersey bull, Oxford Nora's Fox, have been added to the Jersey herd at the University Farm. A well-bred Holstein-Friesian bull, Changeling Pontiac De Kol, owned by B. Coman of Phoenix, was loaned temporarily to the University. A number of the Holstein-Friesian cows on the University Farm were tested officially for Advanced Registry during the year. The following official records were made: The above named Holsteins and one Jersey, Arizona's Butter Girl, No. 378677, are on semi-official test. The other cows in the herd will be put on semi-official test during the present year. Daily records were kept of the milk yield of all the dairy cows, and a two-day composite sample of milk was tested each month to get an estimate of the fat production. This report covers the period from July 1, 1920, to June 30, 1921, and does not give the production for exact lactation periods. Some of the cows were dry for a portion of the year. Table V. gives the milk and butterfat production for the fiscal year. An experiment has been conducted to determine the value of Sudan grass hay in the ration of dairy cows. In addition to hay, silage and grain were fed in like manner to all the cows on test. The rations were computed so that each cow received at least the minimum amount of digestible nutrients required by the Wolff-Lehman feeding standard. The ration containing alfalfa hay produced about eleven percent more butterfat than the ration containing Sudan grass hay. After all factors are taken into consideration, this test would indicate that Sudan grass hay is worth less than threefourths the price of alfalfa hay as a feed for dairy cows. Full data regarding this test will be published in a Timely Hint. GREEN ALFALFA VERSUS ALFALFA HAY FOR DAIRY COWS In Arizona, soiling of alfalfa is practiced to a considerable extent where pasturing is not possible. Many believe that cows will not do as well on dry hay as on green feed, and that if cows cannot be pastured, the forage should be cut and fed green. While soiling is considered to be too expensive as a general practice, the soiling of alfalfa may have some merit under Arizona conditions, if labor is not too expensive. A test has been started to secure data on the relative feeding values of green alfalfa and alfalfa hay; to determine the relative amounts of feed obtained per acre by soiling and by making hay; and to determine, as far as possible, the relative economy of the two methods of feeding when production is considered. MILK SUBSTITUTES FOR FEEDING CALVES Three new calves have been added to this project, which was described in the Thirty-First Annual Report. Two of these calves are in Group 3, and are being fed a ration of commercial calf meal; the other calf is in Group 4 and is being fed commercial calf meal plus homemade calf meal. Some changes have been made in the methods, in that Group 4 will be fed on commercial calf meal for two months and on homemade meal for the following three months. The homemade calf meal contains the following ingredients: C. T. VORHIES During the fiscal year 1920-1921, the investigation work of the life history of the banner-tailed kangaroo rat (Dipodomys spectabilis) has been completed. This work has been carried as an Adams fund project. The life-history phase of the investigation has been written up in co-authorship with Dr. Walter P. Taylor of the United States Biological Survey and will shortly appear as a joint publication of this Station and the Bureau of Biological Survey, United States Department of Agriculture. WORK ON ARIZONA PINK BOLLWORM In August, 1920, a new Adams fund project was inaugurated. This is an investigation of a native insect which exists on the Arizona wild cotton (Thurberia thespesioides). In its larval or grub stage this pest lives in and eats out the bolls of the wild cotton to the number of several bolls for each larva. It is, therefore, in fact a native bollworm, more destructive to its normal host than the Arizona boll weevil. It has been called the "Arizona pink bollworm" and may continue to be so called, since it is distinctly pink in color. It should be kept clearly in mind, however, that this is neither the ordinary bollworm nor the corn ear-worm, already infesting cultivated cotton in Arizona; nor is it the same as the Egyptian pink bollworm, which dreaded pest does not yet occur in this State. These two pink bollworms belong, in fact, to different families of moths. The insect now under consideration does not occur as yet on cultivated cotton anywhere, but must be recognized as a potentially dangerous insect. The investigation now under way is designed to determine whether the Arizona pink bollworm is adaptable to cultivated cotton, and also whether it is likely to become a dangerous pest of that crop. We have already proved that this insect can live its entire larval life in the bolls of Pima cotton. WHEAT INJURY DUE TO HYLEMYIA CILICRURA In December, 1920, samples of seed wheat, which had almost wholly failed to germinate in certain fields, were brought in by Mr. F. L. Ginter of Safford, Arizona. The grains, recovered from the soil of the affected fields, were found to be infested and eaten out by numerous small fly larvae. From these |