Report of the State Entomologist of Connecticut for the year ... . 5 12 4 % calomel - log scale Figure 10. Dosage-response curve for surface treat-ment using calomel at planting time. 274 Connecticut Experiment Station Bulletin 472 prevented any conclusion other than that all treated plots yielded substan-tially better than the untreated ones. The results show that the dosage-response curve for control of theseinsects is relatively flat. In other words, the relative response from achange of one unit of dosage was very small. Table 31. Dosage Test, Calomel-Clay Dust on the Cabbage Maggot Per ce
Report of the State Entomologist of Connecticut for the year ... . 5 12 4 % calomel - log scale Figure 10. Dosage-response curve for surface treat-ment using calomel at planting time. 274 Connecticut Experiment Station Bulletin 472 prevented any conclusion other than that all treated plots yielded substan-tially better than the untreated ones. The results show that the dosage-response curve for control of theseinsects is relatively flat. In other words, the relative response from achange of one unit of dosage was very small. Table 31. Dosage Test, Calomel-Clay Dust on the Cabbage Maggot Per cent calomel Number of larvae and pupae Per cent reduction . Check 7457493529 169 Mexican Bean Beetle Bountiful beans planted May 1 were dusted on May 28, June 16 andJune 26. The rate of application per acre was large, approximately 70pounds for each application. On June 29 and 30, counts were made of thelarvae on 10 plants of each plot. The results are given in Table 32 and % rotenone- log scale0625 .125 .25. .05 .1 .2 %pyrethrins-log scale Figure 11. Dosage-response curves for impregnated pyrethrum dust (p)and derris (d), first-generation Mexican bean beetle. Derris .0625 rotenone 216 .125 74 .25 38 .5 20 12 Impregnated .025 pyrethrins 544 pyrethrum .05 321 .10 254 .2 71 .4 34 Connecticut State Entomologist 275 Figure 11. Yield records were kept but failed to show any differencesattributable to treatment. The dosage-response curves are relatively flat. In terms of dosage forequal control, at the 90 per cent level for larvae .15 per cent pyrethrinsequalled .08 per cent rotenone in derris dust. Table 32. First-Generation Mexican Bean BeetleDerris and Pyrethrum with Pyrophyllite Diluent Concentration Number of larvae Per cent reductior. Toxicant percentage on 40 plants in larvae None None 1,285 Results of similar tests on the second generation of the Mexican beanbeetle have been reported (Turner, 4). I
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