. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 34 BULLETIN 1243^ U. S. DEPARTMENT OF AGRICULTURE. on this point. This is shown in experiments performed under conditions of light infestation, with the possible exception of the zinc arsenite experiments. Injury by this insecticide is not easily estimated by observation. When infestation by the Mexican bean. Fig. 15.âDusting beans with a knapsack bellows type of duster. beetle is light, variations in yield are attributed to insecticide treat- ment, which often causes a decrease in yield. Each experiment must be compar
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 34 BULLETIN 1243^ U. S. DEPARTMENT OF AGRICULTURE. on this point. This is shown in experiments performed under conditions of light infestation, with the possible exception of the zinc arsenite experiments. Injury by this insecticide is not easily estimated by observation. When infestation by the Mexican bean. Fig. 15.âDusting beans with a knapsack bellows type of duster. beetle is light, variations in yield are attributed to insecticide treat- ment, which often causes a decrease in yield. Each experiment must be compared with check plats and other plats tested at the same time, because of variations in land, season, and climatic factors. â w â A85, ifc t^di^i v. ..- 1 ' .. *â â¢*"*' Bnfit'Si "*v§2Ss8BP?i--""' -* ⢠â "â â â '£mf*L? -- â -v - * â " r^MwKg1 Fig. 16.âPower duster used in experiments in control of the Mexican bean beetle. Under typical conditions in the Southeast, summer crops of bush beans do not produce well. In experiments where injury from treatment was serious, beetle injury would not be Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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