I"e!)ni.-iry, 1935)] agkh ii.rrKAi. experiments 1938 37 



of the carf)ohy(lrate ; those grown in the solution containing one-tenth the 

 potassium contained very much less ; while the third group contained prac- 

 • tically none. Similar diftcrences. although not so marked, appear in the 

 tomato plant analyses. (Adams Fund.) 



DETERMINING HARDINESS BY ANILINE DYE 



ADSORPTION 



The suggestion that relative hardiness of different varieties of apples may 

 be ascertained by studies of adsorption of certain aniline dyes by pulverized 

 apple twig tissues was further investigated by Stuart Dunn. Experiments 

 were also made with alfalfa and cabbage. Twelve varieties of apples were 

 tested from samples collected in December and March. I\TcIntosh and 

 Baldwin l)oth checked with growers' experiences ; Mcintosh was found to 

 be most hardy of the varieties, and Baldwin was either the least or next to 

 the least hardy. With other varieties, however, it can only be said that 

 they remained groujied in either the most hardy half of the scale or the least 

 hardy half. 



Roots of Kansas Common, a tender variety of alfalfa, and Grimm, a 

 hardy variety, were tested for dye adsorption in February, March and 

 April. In February and March the experiments checked with the known 

 hardiness of the two varieties, but in .\])ril the reverse was true. 



The effect of hardening calibage plants on the rate of dye adsorption was 

 studied. Plants were grown at 3° C. and 23° C. The tests showed that 

 the longer the period of time the nlant was hardened the greater was the 

 amount of adsorption. fAdmns Fund. ) 



PREHEATING SEED TO CONTROL BEAN ANTHRACNOSE 



Studies on the control of cotton anthracnose in North Carolina have 

 shown, that heating the seed 80° C. to 95° C. killed the seed-borne elements 

 of the fungus. Preheating at temperatures of 45° C. to 00° C. enabled the 

 seed to withstand higher tcm]")cratures without much loss. 



Stuart Dunn followed the same lines of this experiment for the control 

 of bean anthracnose. Under similar circumstances bean seed treated at 

 higher temperatures without preheating at lower temperatures showed a 

 greater resistance to heat than cotton seed. 



Healthy and diseased Red Kidney and Bountiful beans were preheated 

 in different groups of samples at 50° C. for 20, 21 and 26 days and after- 

 wards heated at 80, 85 and 90° C. for a period ranging from 2 to 18 hours. 

 Periods of 4 to 10 hours of higher temperatures least hindered the healthy 

 seed, and all but a small percentage of the diseased seed was killed. 



Disease-free seed of Red Kidney and Yellow Eyed beans was produced, 

 and will be distributed to growers interested in producing seed beans for 

 market. (Hatch Fund.) 



HERBICIDES FOR MUSTARD 



A search for a satisfactory herbicide for the control of mustard is under 

 way, in charge of R. Bissey. Herbicides are generally thought to be more 



