Rate of multiplication of the Hessian fly McConnell, Wilbur R., 1881-1920 creator text book Washington, D.C U.S. Dept. of Agriculture 1921 1921
print
ENG Caption title. "November 15, 1921" "Professional paper" Hessian flies Reproduction Bulletin of the U.S. Department of Agriculture, no. 1008 https://www.biodiversitylibrary.org/bibliography/108280 16656070890505 10.5962/bhl.title.108280 RQF