Joint Sterilizing Effect of a Mixture of Hempa and Thiohempa, and of Hempa and N, N, N', N'-tetramethyl-P-morpholinophosphinic diamide on the Azuki Bean Weevil, <i>Callosobruchus chinensis</i> L. Studies on the Chemosterilants of Insects. XIII.

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  • HempaとthiohempaおよびhempaとN, N, N', N'-tetrametyl-P-morpholinophosphinic diamideのアズキゾウムシに対する連合不妊作用
  • Hempa ト thiohempa オヨビ hempa ト N , N , N , N -tetramethyl-P-morpholinophosphinic diamide ノ アズキゾウムシ ニ タイスル レンゴウ フニン サヨウ

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The median effective dosages of hempa and thiohempa inhibiting the hatchability of eggs deposited by the topically treated weevils were estimated as 12.582 and 3.347μg/_??_, _??_. In this case, the relations between dosage of chemicals in logarithms and the per cent of hatchability in probits for thiohempa, hempa, and their 1:1 combination, were analysed at the same time by FINNEY'S (1944, 1949b) maximum likelihood estimation method of the parameters of the tolerance distribution with adjustment for natural control. The measure of synergism between thiohempa and hempa calculated from the three parallel regression lines was not significant at Pr=0.05, χ2(1)=1.966. Thus, it could be concluded that thiohempa and hempa jointly acted in a similar way on the hatchability of eggs of the azuki bean weevil. Dosage-oviposition inhibiting regression lines for hempa and ENT-51008 (N, N, N', N'-tetramethyl-P-morpholinophosphinic diamide) calculated by the procedure of WADLEY (1949) and FINNEY (1949a) were not parallel. From the result of comparison of observation for their 1:1 combination with the similar action prediction calculated by the equation Y=1/2(Y1+Y2)+θlog2 with average θ=3.3239, it could be concluded that hempa and ENT-51008 jointly acted in a simple similar way, χ2(8)(0.05)=15.507. Similar joint action concerning the inhibition of hatching or emergence was also found between hempa and ENT-51008, χ2(1)=0.538 and 1.060, respectively. From the figures of median effective dosages shown in Table 7, it could be assumed that ENT-51008 inhibits the egg deposition of the azuki bean weevil and has no effect on the hatchability of the deposited eggs or the emergence of the next offsprng. Hempa slightly affects on the egg deposition but its main physiological effect is the inhibition of egg hatching. The relative potency of hempa to ENT-51008 was 4.011 in inhibiting the egg hatchability, and 4.651 in inhibiting the adult emergence. From the figures of both relative potencies, it could be said that both chemicals have no physiological effect on the larval or pupal stage of the next generation of treated weevils.

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