We investigated the inheritance of tebufenozide resistance in the smaller tea tortrix, Adoxophyes honmai Yasuda, by crossing experiments using resistant (R) and susceptible (S) strains of Shizuoka Prefecture. The lethal concentration 50 values (ppm) of tebufenozide in the R and S strains were 595 and 4.46, respectively. The results of the F1 and F1′ strains suggested that resistance to tebufenozide was inherited as an autosomal and incompletely dominant trait. Furhermore, the results of F2, F2′, and backcross strains showed that the resistance was controlled by polygenic factors.
The same numbers of Bemisia tabaci (Gennadius) biotype B and Q adults were released on tomato plants grown in soil treated with different insecticides at planting. Around 60–160 days after the release, the growth response and competitive displacement of biotype B to Q were monitored at two different periods (the summer and winter periods). Compared with the control, the numbers of adults were lesser at the insecticide treated plots. Although the ratio of biotype B decreased at the imidacloprid-treated plot, it increased at the chlorantraniliprole-treated plot and control plot. These tendencies did not change between the two periods. These results indicate that the displacement of biotype B to Q (or Q to B) would strongly depend on whether the insecticide treatments are lesser effective on one biotype than the other.
The sex of adults of Phenolia (Lasiodites) picta (MacLeay) is distinguished by the morphology of the pygidium and the presence of a well sclerotized tergite VIII in males. These differences are visible under a binocular microscope at a low magnification (15×). As the difference between the sexes can be distinguished without killing specimens, it can be used to observe the specific behaviors of females and males and in ecological research.