COLORADO. 107 



means of control were recommended. The study of the raspberry 

 yelloAYS was made on material grown at Loveland, and while it is 

 thought that a remedy has been found the work is to be continued 

 another season. 



The principal question under investigation with reference to the 

 hold-over blight in pear and api^le trees is the resistance of these 

 germs to the severe Avinters of Colorado. Observations were begun 

 by the botanist on the black rot of the strawberry to determine 

 whether this is caused by winter injury or whether it is due to some 

 soil organism. The work has thus far been conducted in the green- 

 house but it is proposed also to make field culture experiments. The 

 investigations on plant lice were actively continued and satisfactory 

 progress was made. 



In addition to the Adams-fund work numerous Hatch-fund pro- 

 jects were carried on. Considerable work was done on the correla- 

 tion of characters in wheat, oats, and barley, and alfalfa breeding 

 was conducted in a large alfalfa nursery at Kocky Ford, where many 

 distinct varieties of alfalfa are grown, and where a promising strain 

 has been developed. On the Plains region in eastern Colorado, ex- 

 periments were carried on in different localities with durum wheat, 

 corn, and forage crops. Special experiments with methods for 

 diminishing the effect of w^inds on the movement of soils were tried, 

 and studies of farm management to determine the feasible methods 

 of dry farming in this region were made. The work in agronomy 

 Avas largely maintained with State funds. 



The entomological department carried on work with reference to 

 the codling moth, potato insects, and other insect pests. An orchard 

 of about 900 trees planted a few years ago principally for the pur- 

 pose of determining the injurious effects of crown gall and woolly 

 aphis upon the crown and roots of small trees, was used this year in 

 connection wath spraying experiments for the destruction of plant 

 lice. The codling-moth work was essentially a comparison of arsen- 

 ate of lead and sulphate of arsenic for the destruction of this insect. 

 The injurious effects of these substances on the foliage was also ob- 

 served. Some cooperative work along this line was carried on with 

 orchardists throughout the State, and a few minor insect pests re- 

 ceived attention. In the study of potato insects special attention was 

 given to the Colorado potato beetle and the cucumber flea beetle. 



The horticultural experiments were supported by the Hatch fund 

 and a State appropriation of $10,000 for the biennium, and much of 

 the work was done in different parts of the State. The principal 

 crops receiving attention were asparagus, raspberries, cauliflower, 

 cabbages and other vegetables, and apples. Experiments were con- 



