W. J. Hooker ............................................ President P. J. Eastman ...................................... President-elect O. C. Turnquist .................................. Vice-President N. M. Parks .................... I.mmediate Past President J. C. Campbell ............................................ Treasurer R. V. Akeley ................................................ Secretary E. J. Wheeler ................................................ Director D. S. McLachlan .......................................... Director C. E. Cunningham ........................................ Director

I. Control of Weeds in Potatoes by Pre-emergence Sprays (I 5 min.) ORA SMITH, M. W. MEADOWS and E. R. MARSHALL, Cornell University, Ithaca, N. Y. 2. Revolutionary Changes in Potato Production as a Result of Chemical Weed Control (15 min.) ORA SMITH, E. R. MARSHALL and M. W. MEADOWS, Cornell University, Ithaca, N. Y. 3. Effect of Vine Killers and Enviromnental Factors on Vascular Discoloration in Potatoes (15 min.) M. W. MEADOWS and ORA SMITH, Cornell University, Ithaca, N. Y. 4. The Effect of Incorporating 2, 4-D in the Regular Spray on the Yield of White Potatoes (15 min.) N . E . ELLIS, Purdue University, Lafayette, Ind. 5. P.otato Vine Killing in Prince Edward Island (15 min.) L. C. CALLBECK, Department of Agriculture, Charlottstown, P. E. I., Canada. 6. Chemical Weed ,Control Results in 1948 (15 min.) J. STANLEY COBB, Pennsylvania State College, State College, Pa. 7. Sprout Inhibition of Non-dormant Chippewa Potatoes (15 min.) R. H. BRADLEY and LESLIE L. DEAN, Purdue University, Lafayette, Ind. 8. Effect oJ Type of Container on the Shrinkage of Stored Potatoes (IO min. lantern). E. V. HARDENBURG, Cornell Upiversity, Ithaca, N. Y.

Zoospore suspensions ofPhytophthora infestans applied to potato cultivars in the field with an exponential inoculum sprayer resulted in defoliation within a range of severity that was log-normal with respect to inoculum concentration. Regression lines for different cultivars differed in position and, depending upon moisture conditions, slope, indicating that the cultivars differed in resistance to penetration and to invasion of tissue by the pathogen.

The use of the highest scab method for estimating resistance to common scab of parent clones of potato was studied. Under Minnesota conditions, three years of testing appear necessary for estimating clonal resistance by the highest scab method.

The Osseo is an early, puick maturing variety with a distinct upright compact habit of growth. Yields are comparable to Waseca and Red Warba with an exceptionally high per cent composed of tubers above 2I/4'' in diameter. Tubers are white, smooth, round, blocky and uniform in size. It should prove useful wherever an extra whrly white variety is desired.